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LoongArch changes for v6.9 

1, Add objtool support for LoongArch;
 2, Add ORC stack unwinder support for LoongArch;
 3, Add kernel livepatching support for LoongArch;
 4, Select ARCH_HAS_CURRENT_STACK_POINTER in Kconfig;
 5, Select HAVE_ARCH_USERFAULTFD_MINOR in Kconfig;
 6, Some bug fixes and other small changes.
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Merge tag 'loongarch-6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

Pull LoongArch updates from Huacai Chen:

 - Add objtool support for LoongArch

 - Add ORC stack unwinder support for LoongArch

 - Add kernel livepatching support for LoongArch

 - Select ARCH_HAS_CURRENT_STACK_POINTER in Kconfig

 - Select HAVE_ARCH_USERFAULTFD_MINOR in Kconfig

 - Some bug fixes and other small changes

* tag 'loongarch-6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
  LoongArch/crypto: Clean up useless assignment operations
  LoongArch: Define the __io_aw() hook as mmiowb()
  LoongArch: Remove superfluous flush_dcache_page() definition
  LoongArch: Move {dmw,tlb}_virt_to_page() definition to page.h
  LoongArch: Change __my_cpu_offset definition to avoid mis-optimization
  LoongArch: Select HAVE_ARCH_USERFAULTFD_MINOR in Kconfig
  LoongArch: Select ARCH_HAS_CURRENT_STACK_POINTER in Kconfig
  LoongArch: Add kernel livepatching support
  LoongArch: Add ORC stack unwinder support
  objtool: Check local label in read_unwind_hints()
  objtool: Check local label in add_dead_ends()
  objtool/LoongArch: Enable orc to be built
  objtool/x86: Separate arch-specific and generic parts
  objtool/LoongArch: Implement instruction decoder
  objtool/LoongArch: Enable objtool to be built
This commit is contained in:
Linus Torvalds 2024-03-22 10:22:45 -07:00
parent 4f55aa85a8 fea1c949f6
commit 1e3cd03c54
63 changed files with 2040 additions and 266 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/loongarch/Kconfig
View File

@ -15,6 +15,7 @@ config LOONGARCH
select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_CPU_FINALIZE_INIT
select ARCH_HAS_CURRENT_STACK_POINTER
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_KCOV
select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
@ -104,6 +105,7 @@ config LOONGARCH
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
select HAVE_ARCH_USERFAULTFD_MINOR if USERFAULTFD
select HAVE_ASM_MODVERSIONS
select HAVE_CONTEXT_TRACKING_USER
select HAVE_C_RECORDMCOUNT
@ -133,20 +135,24 @@ config LOONGARCH
select HAVE_KPROBES
select HAVE_KPROBES_ON_FTRACE
select HAVE_KRETPROBES
select HAVE_LIVEPATCH
select HAVE_MOD_ARCH_SPECIFIC
select HAVE_NMI
select HAVE_OBJTOOL if AS_HAS_EXPLICIT_RELOCS
select HAVE_PCI
select HAVE_PERF_EVENTS
select HAVE_PERF_REGS
select HAVE_PERF_USER_STACK_DUMP
select HAVE_PREEMPT_DYNAMIC_KEY
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RELIABLE_STACKTRACE if UNWINDER_ORC
select HAVE_RETHOOK
select HAVE_RSEQ
select HAVE_RUST
select HAVE_SAMPLE_FTRACE_DIRECT
select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
select HAVE_SETUP_PER_CPU_AREA if NUMA
select HAVE_STACK_VALIDATION if HAVE_OBJTOOL
select HAVE_STACKPROTECTOR
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_TIF_NOHZ
@ -624,6 +630,8 @@ config RANDOMIZE_BASE_MAX_OFFSET
This is limited by the size of the lower address memory, 256MB.
source "kernel/livepatch/Kconfig"
endmenu
config ARCH_SELECT_MEMORY_MODEL

11
arch/loongarch/Kconfig.debug
View File

@ -26,4 +26,15 @@ config UNWINDER_PROLOGUE
Some of the addresses it reports may be incorrect (but better than the
Guess unwinder).
config UNWINDER_ORC
bool "ORC unwinder"
select OBJTOOL
help
This option enables the ORC (Oops Rewind Capability) unwinder for
unwinding kernel stack traces. It uses a custom data format which is
a simplified version of the DWARF Call Frame Information standard.
Enabling this option will increase the kernel's runtime memory usage
by roughly 2-4MB, depending on your kernel config.
endchoice

23
arch/loongarch/Makefile
View File

@ -26,6 +26,18 @@ endif
32bit-emul = elf32loongarch
64bit-emul = elf64loongarch
ifdef CONFIG_UNWINDER_ORC
orc_hash_h := arch/$(SRCARCH)/include/generated/asm/orc_hash.h
orc_hash_sh := $(srctree)/scripts/orc_hash.sh
targets += $(orc_hash_h)
quiet_cmd_orc_hash = GEN $@
cmd_orc_hash = mkdir -p $(dir $@); \
$(CONFIG_SHELL) $(orc_hash_sh) < $< > $@
$(orc_hash_h): $(srctree)/arch/loongarch/include/asm/orc_types.h $(orc_hash_sh) FORCE
$(call if_changed,orc_hash)
archprepare: $(orc_hash_h)
endif
ifdef CONFIG_DYNAMIC_FTRACE
KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
CC_FLAGS_FTRACE := -fpatchable-function-entry=2
@ -72,8 +84,6 @@ KBUILD_CFLAGS_KERNEL += $(call cc-option,-mdirect-extern-access)
KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdirect-access-external-data)
KBUILD_AFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data)
KBUILD_CFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data)
KBUILD_AFLAGS_MODULE += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
else
cflags-y += $(call cc-option,-mno-explicit-relocs)
KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel
@ -82,6 +92,15 @@ KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs
KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
endif
KBUILD_AFLAGS += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
KBUILD_CFLAGS += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
KBUILD_AFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
KBUILD_CFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
ifdef CONFIG_OBJTOOL
KBUILD_CFLAGS += -fno-jump-tables
endif
KBUILD_RUSTFLAGS += --target=$(objtree)/scripts/target.json
KBUILD_RUSTFLAGS_MODULE += -Crelocation-model=pic

2
arch/loongarch/crypto/crc32-loongarch.c
View File

@ -44,7 +44,6 @@ static u32 crc32_loongarch_hw(u32 crc_, const u8 *p, unsigned int len)
CRC32(crc, value, w);
p += sizeof(u32);
len -= sizeof(u32);
}
if (len & sizeof(u16)) {
@ -80,7 +79,6 @@ static u32 crc32c_loongarch_hw(u32 crc_, const u8 *p, unsigned int len)
CRC32C(crc, value, w);
p += sizeof(u32);
len -= sizeof(u32);
}
if (len & sizeof(u16)) {

3
arch/loongarch/include/asm/Kbuild
View File

@ -1,9 +1,12 @@
# SPDX-License-Identifier: GPL-2.0
generated-y += orc_hash.h
generic-y += dma-contiguous.h
generic-y += mcs_spinlock.h
generic-y += parport.h
generic-y += early_ioremap.h
generic-y += qrwlock.h
generic-y += qspinlock.h
generic-y += rwsem.h
generic-y += segment.h
generic-y += user.h

1
arch/loongarch/include/asm/bug.h
View File

@ -44,6 +44,7 @@
do { \
instrumentation_begin(); \
__BUG_FLAGS(BUGFLAG_WARNING|(flags)); \
annotate_reachable(); \
instrumentation_end(); \
} while (0)

3
arch/loongarch/include/asm/cacheflush.h
View File

@ -37,8 +37,6 @@ void local_flush_icache_range(unsigned long start, unsigned long end);
#define flush_icache_range local_flush_icache_range
#define flush_icache_user_range local_flush_icache_range
#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
#define flush_cache_all() do { } while (0)
#define flush_cache_mm(mm) do { } while (0)
#define flush_cache_dup_mm(mm) do { } while (0)
@ -47,7 +45,6 @@ void local_flush_icache_range(unsigned long start, unsigned long end);
#define flush_cache_vmap(start, end) do { } while (0)
#define flush_cache_vunmap(start, end) do { } while (0)
#define flush_icache_user_page(vma, page, addr, len) do { } while (0)
#define flush_dcache_page(page) do { } while (0)
#define flush_dcache_mmap_lock(mapping) do { } while (0)
#define flush_dcache_mmap_unlock(mapping) do { } while (0)

2
arch/loongarch/include/asm/exception.h
View File

@ -6,6 +6,8 @@
#include <asm/ptrace.h>
#include <linux/kprobes.h>
extern void *exception_table[];
void show_registers(struct pt_regs *regs);
asmlinkage void cache_parity_error(void);

2
arch/loongarch/include/asm/io.h
View File

@ -71,6 +71,8 @@ extern void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t
#define memcpy_fromio(a, c, l) __memcpy_fromio((a), (c), (l))
#define memcpy_toio(c, a, l) __memcpy_toio((c), (a), (l))
#define __io_aw() mmiowb()
#include <asm-generic/io.h>
#define ARCH_HAS_VALID_PHYS_ADDR_RANGE

7
arch/loongarch/include/asm/module.h
View File

@ -6,6 +6,7 @@
#define _ASM_MODULE_H
#include <asm/inst.h>
#include <asm/orc_types.h>
#include <asm-generic/module.h>
#define RELA_STACK_DEPTH 16
@ -21,6 +22,12 @@ struct mod_arch_specific {
struct mod_section plt;
struct mod_section plt_idx;
#ifdef CONFIG_UNWINDER_ORC
unsigned int num_orcs;
int *orc_unwind_ip;
struct orc_entry *orc_unwind;
#endif
/* For CONFIG_DYNAMIC_FTRACE */
struct plt_entry *ftrace_trampolines;
};

18
arch/loongarch/include/asm/orc_header.h Normal file
View File

@ -0,0 +1,18 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ORC_HEADER_H
#define _ORC_HEADER_H
#include <linux/types.h>
#include <linux/compiler.h>
#include <asm/orc_hash.h>
/*
* The header is currently a 20-byte hash of the ORC entry definition; see
* scripts/orc_hash.sh.
*/
#define ORC_HEADER \
__used __section(".orc_header") __aligned(4) \
static const u8 orc_header[] = { ORC_HASH }
#endif /* _ORC_HEADER_H */

31
arch/loongarch/include/asm/orc_lookup.h Normal file
View File

@ -0,0 +1,31 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ORC_LOOKUP_H
#define _ORC_LOOKUP_H
/*
* This is a lookup table for speeding up access to the .orc_unwind table.
* Given an input address offset, the corresponding lookup table entry
* specifies a subset of the .orc_unwind table to search.
*
* Each block represents the end of the previous range and the start of the
* next range. An extra block is added to give the last range an end.
*
* The block size should be a power of 2 to avoid a costly 'div' instruction.
*
* A block size of 256 was chosen because it roughly doubles unwinder
* performance while only adding ~5% to the ORC data footprint.
*/
#define LOOKUP_BLOCK_ORDER 8
#define LOOKUP_BLOCK_SIZE (1 << LOOKUP_BLOCK_ORDER)
#ifndef LINKER_SCRIPT
extern unsigned int orc_lookup[];
extern unsigned int orc_lookup_end[];
#define LOOKUP_START_IP (unsigned long)_stext
#define LOOKUP_STOP_IP (unsigned long)_etext
#endif /* LINKER_SCRIPT */
#endif /* _ORC_LOOKUP_H */

58
arch/loongarch/include/asm/orc_types.h Normal file
View File

@ -0,0 +1,58 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ORC_TYPES_H
#define _ORC_TYPES_H
#include <linux/types.h>
/*
* The ORC_REG_* registers are base registers which are used to find other
* registers on the stack.
*
* ORC_REG_PREV_SP, also known as DWARF Call Frame Address (CFA), is the
* address of the previous frame: the caller's SP before it called the current
* function.
*
* ORC_REG_UNDEFINED means the corresponding register's value didn't change in
* the current frame.
*
* The most commonly used base registers are SP and FP -- which the previous SP
* is usually based on -- and PREV_SP and UNDEFINED -- which the previous FP is
* usually based on.
*
* The rest of the base registers are needed for special cases like entry code
* and GCC realigned stacks.
*/
#define ORC_REG_UNDEFINED 0
#define ORC_REG_PREV_SP 1
#define ORC_REG_SP 2
#define ORC_REG_FP 3
#define ORC_REG_MAX 4
#define ORC_TYPE_UNDEFINED 0
#define ORC_TYPE_END_OF_STACK 1
#define ORC_TYPE_CALL 2
#define ORC_TYPE_REGS 3
#define ORC_TYPE_REGS_PARTIAL 4
#ifndef __ASSEMBLY__
/*
* This struct is more or less a vastly simplified version of the DWARF Call
* Frame Information standard. It contains only the necessary parts of DWARF
* CFI, simplified for ease of access by the in-kernel unwinder. It tells the
* unwinder how to find the previous SP and FP (and sometimes entry regs) on
* the stack for a given code address. Each instance of the struct corresponds
* to one or more code locations.
*/
struct orc_entry {
s16 sp_offset;
s16 fp_offset;
s16 ra_offset;
unsigned int sp_reg:4;
unsigned int fp_reg:4;
unsigned int ra_reg:4;
unsigned int type:3;
unsigned int signal:1;
};
#endif /* __ASSEMBLY__ */
#endif /* _ORC_TYPES_H */

3
arch/loongarch/include/asm/page.h
View File

@ -75,6 +75,9 @@ typedef struct { unsigned long pgprot; } pgprot_t;
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
#define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
struct page *dmw_virt_to_page(unsigned long kaddr);
struct page *tlb_virt_to_page(unsigned long kaddr);
#define virt_to_pfn(kaddr) PFN_DOWN(PHYSADDR(kaddr))
#define virt_to_page(kaddr) \

7
arch/loongarch/include/asm/percpu.h
View File

@ -29,7 +29,12 @@ static inline void set_my_cpu_offset(unsigned long off)
__my_cpu_offset = off;
csr_write64(off, PERCPU_BASE_KS);
}
#define __my_cpu_offset __my_cpu_offset
#define __my_cpu_offset \
({ \
__asm__ __volatile__("":"+r"(__my_cpu_offset)); \
__my_cpu_offset; \
})
#define PERCPU_OP(op, asm_op, c_op) \
static __always_inline unsigned long __percpu_##op(void *ptr, \

3
arch/loongarch/include/asm/pgtable.h
View File

@ -363,9 +363,6 @@ static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *pt
extern pgd_t swapper_pg_dir[];
extern pgd_t invalid_pg_dir[];
struct page *dmw_virt_to_page(unsigned long kaddr);
struct page *tlb_virt_to_page(unsigned long kaddr);
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..

18
arch/loongarch/include/asm/qspinlock.h
View File

@ -1,18 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_QSPINLOCK_H
#define _ASM_QSPINLOCK_H
#include <asm-generic/qspinlock_types.h>
#define queued_spin_unlock queued_spin_unlock
static inline void queued_spin_unlock(struct qspinlock *lock)
{
compiletime_assert_atomic_type(lock->locked);
c_sync();
WRITE_ONCE(lock->locked, 0);
}
#include <asm-generic/qspinlock.h>
#endif /* _ASM_QSPINLOCK_H */

3
arch/loongarch/include/asm/stackframe.h
View File

@ -13,6 +13,7 @@
#include <asm/asm-offsets.h>
#include <asm/loongarch.h>
#include <asm/thread_info.h>
#include <asm/unwind_hints.h>
/* Make the addition of cfi info a little easier. */
.macro cfi_rel_offset reg offset=0 docfi=0
@ -162,6 +163,7 @@
li.w t0, CSR_CRMD_WE
csrxchg t0, t0, LOONGARCH_CSR_CRMD
#endif
UNWIND_HINT_REGS
.endm
.macro SAVE_ALL docfi=0
@ -219,6 +221,7 @@
.macro RESTORE_SP_AND_RET docfi=0
cfi_ld sp, PT_R3, \docfi
UNWIND_HINT_FUNC
ertn
.endm

2
arch/loongarch/include/asm/thread_info.h
View File

@ -86,6 +86,7 @@ register unsigned long current_stack_pointer __asm__("$sp");
#define TIF_LASX_CTX_LIVE 18 /* LASX context must be preserved */
#define TIF_USEDLBT 19 /* LBT was used by this task this quantum (SMP) */
#define TIF_LBT_CTX_LIVE 20 /* LBT context must be preserved */
#define TIF_PATCH_PENDING 21 /* pending live patching update */
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
@ -105,6 +106,7 @@ register unsigned long current_stack_pointer __asm__("$sp");
#define _TIF_LASX_CTX_LIVE (1<<TIF_LASX_CTX_LIVE)
#define _TIF_USEDLBT (1<<TIF_USEDLBT)
#define _TIF_LBT_CTX_LIVE (1<<TIF_LBT_CTX_LIVE)
#define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING)
#endif /* __KERNEL__ */
#endif /* _ASM_THREAD_INFO_H */

20
arch/loongarch/include/asm/unwind.h
View File

@ -16,6 +16,7 @@
enum unwinder_type {
UNWINDER_GUESS,
UNWINDER_PROLOGUE,
UNWINDER_ORC,
};
struct unwind_state {
@ -24,7 +25,7 @@ struct unwind_state {
struct task_struct *task;
bool first, error, reset;
int graph_idx;
unsigned long sp, pc, ra;
unsigned long sp, fp, pc, ra;
};
bool default_next_frame(struct unwind_state *state);
@ -61,14 +62,17 @@ static __always_inline void __unwind_start(struct unwind_state *state,
state->sp = regs->regs[3];
state->pc = regs->csr_era;
state->ra = regs->regs[1];
state->fp = regs->regs[22];
} else if (task && task != current) {
state->sp = thread_saved_fp(task);
state->pc = thread_saved_ra(task);
state->ra = 0;
state->fp = 0;
} else {
state->sp = (unsigned long)__builtin_frame_address(0);
state->pc = (unsigned long)__builtin_return_address(0);
state->ra = 0;
state->fp = 0;
}
state->task = task;
get_stack_info(state->sp, state->task, &state->stack_info);
@ -77,6 +81,18 @@ static __always_inline void __unwind_start(struct unwind_state *state,
static __always_inline unsigned long __unwind_get_return_address(struct unwind_state *state)
{
return unwind_done(state) ? 0 : state->pc;
if (unwind_done(state))
return 0;
return __kernel_text_address(state->pc) ? state->pc : 0;
}
#ifdef CONFIG_UNWINDER_ORC
void unwind_init(void);
void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, void *orc, size_t orc_size);
#else
static inline void unwind_init(void) {}
static inline void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, void *orc, size_t orc_size) {}
#endif
#endif /* _ASM_UNWIND_H */

28
arch/loongarch/include/asm/unwind_hints.h Normal file
View File

@ -0,0 +1,28 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_LOONGARCH_UNWIND_HINTS_H
#define _ASM_LOONGARCH_UNWIND_HINTS_H
#include <linux/objtool.h>
#include <asm/orc_types.h>
#ifdef __ASSEMBLY__
.macro UNWIND_HINT_UNDEFINED
UNWIND_HINT type=UNWIND_HINT_TYPE_UNDEFINED
.endm
.macro UNWIND_HINT_END_OF_STACK
UNWIND_HINT type=UNWIND_HINT_TYPE_END_OF_STACK
.endm
.macro UNWIND_HINT_REGS
UNWIND_HINT sp_reg=ORC_REG_SP type=UNWIND_HINT_TYPE_REGS
.endm
.macro UNWIND_HINT_FUNC
UNWIND_HINT sp_reg=ORC_REG_SP type=UNWIND_HINT_TYPE_CALL
.endm
#endif /* __ASSEMBLY__ */
#endif /* _ASM_LOONGARCH_UNWIND_HINTS_H */

4
arch/loongarch/kernel/Makefile
View File

@ -3,6 +3,8 @@
# Makefile for the Linux/LoongArch kernel.
#
OBJECT_FILES_NON_STANDARD_head.o := y
extra-y := vmlinux.lds
obj-y += head.o cpu-probe.o cacheinfo.o env.o setup.o entry.o genex.o \
@ -21,6 +23,7 @@ obj-$(CONFIG_ARCH_STRICT_ALIGN) += unaligned.o
CFLAGS_module.o += $(call cc-option,-Wno-override-init,)
CFLAGS_syscall.o += $(call cc-option,-Wno-override-init,)
CFLAGS_traps.o += $(call cc-option,-Wno-override-init,)
CFLAGS_perf_event.o += $(call cc-option,-Wno-override-init,)
ifdef CONFIG_FUNCTION_TRACER
@ -62,6 +65,7 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_UNWINDER_GUESS) += unwind_guess.o
obj-$(CONFIG_UNWINDER_PROLOGUE) += unwind_prologue.o
obj-$(CONFIG_UNWINDER_ORC) += unwind_orc.o
obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_regs.o
obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o

5
arch/loongarch/kernel/entry.S
View File

@ -14,11 +14,13 @@
#include <asm/regdef.h>
#include <asm/stackframe.h>
#include <asm/thread_info.h>
#include <asm/unwind_hints.h>
.text
.cfi_sections .debug_frame
.align 5
SYM_CODE_START(handle_syscall)
UNWIND_HINT_UNDEFINED
csrrd t0, PERCPU_BASE_KS
la.pcrel t1, kernelsp
add.d t1, t1, t0
@ -57,6 +59,7 @@ SYM_CODE_START(handle_syscall)
cfi_st fp, PT_R22
SAVE_STATIC
UNWIND_HINT_REGS
#ifdef CONFIG_KGDB
li.w t1, CSR_CRMD_WE
@ -75,6 +78,7 @@ SYM_CODE_END(handle_syscall)
_ASM_NOKPROBE(handle_syscall)
SYM_CODE_START(ret_from_fork)
UNWIND_HINT_REGS
bl schedule_tail # a0 = struct task_struct *prev
move a0, sp
bl syscall_exit_to_user_mode
@ -84,6 +88,7 @@ SYM_CODE_START(ret_from_fork)
SYM_CODE_END(ret_from_fork)
SYM_CODE_START(ret_from_kernel_thread)
UNWIND_HINT_REGS
bl schedule_tail # a0 = struct task_struct *prev
move a0, s1
jirl ra, s0, 0

7
arch/loongarch/kernel/fpu.S
View File

@ -15,6 +15,7 @@
#include <asm/fpregdef.h>
#include <asm/loongarch.h>
#include <asm/regdef.h>
#include <asm/unwind_hints.h>
#define FPU_REG_WIDTH 8
#define LSX_REG_WIDTH 16
@ -526,3 +527,9 @@ SYM_FUNC_END(_restore_lasx_context)
.L_fpu_fault:
li.w a0, -EFAULT # failure
jr ra
#ifdef CONFIG_CPU_HAS_LBT
STACK_FRAME_NON_STANDARD _restore_fp
STACK_FRAME_NON_STANDARD _restore_lsx
STACK_FRAME_NON_STANDARD _restore_lasx
#endif

6
arch/loongarch/kernel/genex.S
View File

@ -32,6 +32,7 @@ SYM_FUNC_START(__arch_cpu_idle)
SYM_FUNC_END(__arch_cpu_idle)
SYM_CODE_START(handle_vint)
UNWIND_HINT_UNDEFINED
BACKUP_T0T1
SAVE_ALL
la_abs t1, __arch_cpu_idle
@ -49,6 +50,7 @@ SYM_CODE_START(handle_vint)
SYM_CODE_END(handle_vint)
SYM_CODE_START(except_vec_cex)
UNWIND_HINT_UNDEFINED
b cache_parity_error
SYM_CODE_END(except_vec_cex)
@ -67,6 +69,7 @@ SYM_CODE_END(except_vec_cex)
.macro BUILD_HANDLER exception handler prep
.align 5
SYM_CODE_START(handle_\exception)
UNWIND_HINT_UNDEFINED
666:
BACKUP_T0T1
SAVE_ALL
@ -77,7 +80,9 @@ SYM_CODE_END(except_vec_cex)
668:
RESTORE_ALL_AND_RET
SYM_CODE_END(handle_\exception)
.pushsection ".data", "aw", %progbits
SYM_DATA(unwind_hint_\exception, .word 668b - 666b)
.popsection
.endm
BUILD_HANDLER ade ade badv
@ -94,6 +99,7 @@ SYM_CODE_END(except_vec_cex)
BUILD_HANDLER reserved reserved none /* others */
SYM_CODE_START(handle_sys)
UNWIND_HINT_UNDEFINED
la_abs t0, handle_syscall
jr t0
SYM_CODE_END(handle_sys)

3
arch/loongarch/kernel/lbt.S
View File

@ -11,6 +11,7 @@
#include <asm/asm-offsets.h>
#include <asm/errno.h>
#include <asm/regdef.h>
#include <asm/unwind_hints.h>
#define SCR_REG_WIDTH 8
@ -153,3 +154,5 @@ SYM_FUNC_END(_restore_ftop_context)
.L_lbt_fault:
li.w a0, -EFAULT # failure
jr ra
STACK_FRAME_NON_STANDARD _restore_ftop_context

6
arch/loongarch/kernel/mcount_dyn.S
View File

@ -73,6 +73,7 @@ SYM_FUNC_START(ftrace_stub)
SYM_FUNC_END(ftrace_stub)
SYM_CODE_START(ftrace_common)
UNWIND_HINT_UNDEFINED
PTR_ADDI a0, ra, -8 /* arg0: ip */
move a1, t0 /* arg1: parent_ip */
la.pcrel t1, function_trace_op
@ -113,12 +114,14 @@ ftrace_common_return:
SYM_CODE_END(ftrace_common)
SYM_CODE_START(ftrace_caller)
UNWIND_HINT_UNDEFINED
ftrace_regs_entry allregs=0
b ftrace_common
SYM_CODE_END(ftrace_caller)
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
SYM_CODE_START(ftrace_regs_caller)
UNWIND_HINT_UNDEFINED
ftrace_regs_entry allregs=1
b ftrace_common
SYM_CODE_END(ftrace_regs_caller)
@ -126,6 +129,7 @@ SYM_CODE_END(ftrace_regs_caller)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
SYM_CODE_START(ftrace_graph_caller)
UNWIND_HINT_UNDEFINED
PTR_L a0, sp, PT_ERA
PTR_ADDI a0, a0, -8 /* arg0: self_addr */
PTR_ADDI a1, sp, PT_R1 /* arg1: parent */
@ -134,6 +138,7 @@ SYM_CODE_START(ftrace_graph_caller)
SYM_CODE_END(ftrace_graph_caller)
SYM_CODE_START(return_to_handler)
UNWIND_HINT_UNDEFINED
/* Save return value regs */
PTR_ADDI sp, sp, -FGRET_REGS_SIZE
PTR_S a0, sp, FGRET_REGS_A0
@ -155,6 +160,7 @@ SYM_CODE_END(return_to_handler)
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
SYM_CODE_START(ftrace_stub_direct_tramp)
UNWIND_HINT_UNDEFINED
jr t0
SYM_CODE_END(ftrace_stub_direct_tramp)
#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */

22
arch/loongarch/kernel/module.c
View File

@ -20,6 +20,7 @@
#include <linux/kernel.h>
#include <asm/alternative.h>
#include <asm/inst.h>
#include <asm/unwind.h>
static int rela_stack_push(s64 stack_value, s64 *rela_stack, size_t *rela_stack_top)
{
@ -515,15 +516,28 @@ static void module_init_ftrace_plt(const Elf_Ehdr *hdr,
int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs, struct module *mod)
{
const Elf_Shdr *s, *se;
const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
const Elf_Shdr *s, *alt = NULL, *orc = NULL, *orc_ip = NULL, *ftrace = NULL;
for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++) {
for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
if (!strcmp(".altinstructions", secstrs + s->sh_name))
apply_alternatives((void *)s->sh_addr, (void *)s->sh_addr + s->sh_size);
alt = s;
if (!strcmp(".orc_unwind", secstrs + s->sh_name))
orc = s;
if (!strcmp(".orc_unwind_ip", secstrs + s->sh_name))
orc_ip = s;
if (!strcmp(".ftrace_trampoline", secstrs + s->sh_name))
module_init_ftrace_plt(hdr, s, mod);
ftrace = s;
}
if (alt)
apply_alternatives((void *)alt->sh_addr, (void *)alt->sh_addr + alt->sh_size);
if (orc && orc_ip)
unwind_module_init(mod, (void *)orc_ip->sh_addr, orc_ip->sh_size, (void *)orc->sh_addr, orc->sh_size);
if (ftrace)
module_init_ftrace_plt(hdr, ftrace, mod);
return 0;
}

7
arch/loongarch/kernel/relocate_kernel.S
View File

@ -15,6 +15,7 @@
#include <asm/addrspace.h>
SYM_CODE_START(relocate_new_kernel)
UNWIND_HINT_UNDEFINED
/*
* a0: EFI boot flag for the new kernel
* a1: Command line pointer for the new kernel
@ -90,6 +91,7 @@ SYM_CODE_END(relocate_new_kernel)
* then start at the entry point from LOONGARCH_IOCSR_MBUF0.
*/
SYM_CODE_START(kexec_smp_wait)
UNWIND_HINT_UNDEFINED
1: li.w t0, 0x100 /* wait for init loop */
2: addi.w t0, t0, -1 /* limit mailbox access */
bnez t0, 2b
@ -106,6 +108,5 @@ SYM_CODE_END(kexec_smp_wait)
relocate_new_kernel_end:
SYM_DATA_START(relocate_new_kernel_size)
PTR relocate_new_kernel_end - relocate_new_kernel
SYM_DATA_END(relocate_new_kernel_size)
.section ".data"
SYM_DATA(relocate_new_kernel_size, .long relocate_new_kernel_end - relocate_new_kernel)

1
arch/loongarch/kernel/rethook_trampoline.S
View File

@ -76,6 +76,7 @@
.endm
SYM_CODE_START(arch_rethook_trampoline)
UNWIND_HINT_UNDEFINED
addi.d sp, sp, -PT_SIZE
save_all_base_regs

2
arch/loongarch/kernel/setup.c
View File

@ -47,6 +47,7 @@
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/time.h>
#include <asm/unwind.h>
#define SMBIOS_BIOSSIZE_OFFSET 0x09
#define SMBIOS_BIOSEXTERN_OFFSET 0x13
@ -587,6 +588,7 @@ static void __init prefill_possible_map(void)
void __init setup_arch(char **cmdline_p)
{
cpu_probe();
unwind_init();
init_environ();
efi_init();

41
arch/loongarch/kernel/stacktrace.c
View File

@ -29,6 +29,7 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
regs->csr_era = thread_saved_ra(task);
}
regs->regs[1] = 0;
regs->regs[22] = 0;
}
for (unwind_start(&state, task, regs);
@ -39,6 +40,46 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
}
}
int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
void *cookie, struct task_struct *task)
{
unsigned long addr;
struct pt_regs dummyregs;
struct pt_regs *regs = &dummyregs;
struct unwind_state state;
if (task == current) {
regs->regs[3] = (unsigned long)__builtin_frame_address(0);
regs->csr_era = (unsigned long)__builtin_return_address(0);
} else {
regs->regs[3] = thread_saved_fp(task);
regs->csr_era = thread_saved_ra(task);
}
regs->regs[1] = 0;
regs->regs[22] = 0;
for (unwind_start(&state, task, regs);
!unwind_done(&state) && !unwind_error(&state); unwind_next_frame(&state)) {
addr = unwind_get_return_address(&state);
/*
* A NULL or invalid return address probably means there's some
* generated code which __kernel_text_address() doesn't know about.
*/
if (!addr)
return -EINVAL;
if (!consume_entry(cookie, addr))
return -EINVAL;
}
/* Check for stack corruption */
if (unwind_error(&state))
return -EINVAL;
return 0;
}
static int
copy_stack_frame(unsigned long fp, struct stack_frame *frame)
{

42
arch/loongarch/kernel/traps.c
View File

@ -53,6 +53,32 @@
#include "access-helper.h"
void *exception_table[EXCCODE_INT_START] = {
[0 ... EXCCODE_INT_START - 1] = handle_reserved,
[EXCCODE_TLBI] = handle_tlb_load,
[EXCCODE_TLBL] = handle_tlb_load,
[EXCCODE_TLBS] = handle_tlb_store,
[EXCCODE_TLBM] = handle_tlb_modify,
[EXCCODE_TLBNR] = handle_tlb_protect,
[EXCCODE_TLBNX] = handle_tlb_protect,
[EXCCODE_TLBPE] = handle_tlb_protect,
[EXCCODE_ADE] = handle_ade,
[EXCCODE_ALE] = handle_ale,
[EXCCODE_BCE] = handle_bce,
[EXCCODE_SYS] = handle_sys,
[EXCCODE_BP] = handle_bp,
[EXCCODE_INE] = handle_ri,
[EXCCODE_IPE] = handle_ri,
[EXCCODE_FPDIS] = handle_fpu,
[EXCCODE_LSXDIS] = handle_lsx,
[EXCCODE_LASXDIS] = handle_lasx,
[EXCCODE_FPE] = handle_fpe,
[EXCCODE_WATCH] = handle_watch,
[EXCCODE_BTDIS] = handle_lbt,
};
EXPORT_SYMBOL_GPL(exception_table);
static void show_backtrace(struct task_struct *task, const struct pt_regs *regs,
const char *loglvl, bool user)
{
@ -1150,19 +1176,9 @@ void __init trap_init(void)
for (i = EXCCODE_INT_START; i <= EXCCODE_INT_END; i++)
set_handler(i * VECSIZE, handle_vint, VECSIZE);
set_handler(EXCCODE_ADE * VECSIZE, handle_ade, VECSIZE);
set_handler(EXCCODE_ALE * VECSIZE, handle_ale, VECSIZE);
set_handler(EXCCODE_BCE * VECSIZE, handle_bce, VECSIZE);
set_handler(EXCCODE_SYS * VECSIZE, handle_sys, VECSIZE);
set_handler(EXCCODE_BP * VECSIZE, handle_bp, VECSIZE);
set_handler(EXCCODE_INE * VECSIZE, handle_ri, VECSIZE);
set_handler(EXCCODE_IPE * VECSIZE, handle_ri, VECSIZE);
set_handler(EXCCODE_FPDIS * VECSIZE, handle_fpu, VECSIZE);
set_handler(EXCCODE_LSXDIS * VECSIZE, handle_lsx, VECSIZE);
set_handler(EXCCODE_LASXDIS * VECSIZE, handle_lasx, VECSIZE);
set_handler(EXCCODE_FPE * VECSIZE, handle_fpe, VECSIZE);
set_handler(EXCCODE_BTDIS * VECSIZE, handle_lbt, VECSIZE);
set_handler(EXCCODE_WATCH * VECSIZE, handle_watch, VECSIZE);
/* Set exception vector handler */
for (i = EXCCODE_ADE; i <= EXCCODE_BTDIS; i++)
set_handler(i * VECSIZE, exception_table[i], VECSIZE);
cache_error_setup();

528
arch/loongarch/kernel/unwind_orc.c Normal file
View File

@ -0,0 +1,528 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/objtool.h>
#include <linux/module.h>
#include <linux/sort.h>
#include <asm/exception.h>
#include <asm/orc_header.h>
#include <asm/orc_lookup.h>
#include <asm/orc_types.h>
#include <asm/ptrace.h>
#include <asm/setup.h>
#include <asm/stacktrace.h>
#include <asm/tlb.h>
#include <asm/unwind.h>
ORC_HEADER;
#define orc_warn(fmt, ...) \
printk_deferred_once(KERN_WARNING "WARNING: " fmt, ##__VA_ARGS__)
extern int __start_orc_unwind_ip[];
extern int __stop_orc_unwind_ip[];
extern struct orc_entry __start_orc_unwind[];
extern struct orc_entry __stop_orc_unwind[];
static bool orc_init __ro_after_init;
static unsigned int lookup_num_blocks __ro_after_init;
/* Fake frame pointer entry -- used as a fallback for generated code */
static struct orc_entry orc_fp_entry = {
.sp_reg = ORC_REG_FP,
.sp_offset = 16,
.fp_reg = ORC_REG_PREV_SP,
.fp_offset = -16,
.ra_reg = ORC_REG_PREV_SP,
.ra_offset = -8,
.type = ORC_TYPE_CALL
};
/*
* If we crash with IP==0, the last successfully executed instruction
* was probably an indirect function call with a NULL function pointer,
* and we don't have unwind information for NULL.
* This hardcoded ORC entry for IP==0 allows us to unwind from a NULL function
* pointer into its parent and then continue normally from there.
*/
static struct orc_entry orc_null_entry = {
.sp_reg = ORC_REG_SP,
.sp_offset = sizeof(long),
.fp_reg = ORC_REG_UNDEFINED,
.type = ORC_TYPE_CALL
};
static inline unsigned long orc_ip(const int *ip)
{
return (unsigned long)ip + *ip;
}
static struct orc_entry *__orc_find(int *ip_table, struct orc_entry *u_table,
unsigned int num_entries, unsigned long ip)
{
int *first = ip_table;
int *mid = first, *found = first;
int *last = ip_table + num_entries - 1;
if (!num_entries)
return NULL;
/*
* Do a binary range search to find the rightmost duplicate of a given
* starting address. Some entries are section terminators which are
* "weak" entries for ensuring there are no gaps. They should be
* ignored when they conflict with a real entry.
*/
while (first <= last) {
mid = first + ((last - first) / 2);
if (orc_ip(mid) <= ip) {
found = mid;
first = mid + 1;
} else
last = mid - 1;
}
return u_table + (found - ip_table);
}
#ifdef CONFIG_MODULES
static struct orc_entry *orc_module_find(unsigned long ip)
{
struct module *mod;
mod = __module_address(ip);
if (!mod || !mod->arch.orc_unwind || !mod->arch.orc_unwind_ip)
return NULL;
return __orc_find(mod->arch.orc_unwind_ip, mod->arch.orc_unwind, mod->arch.num_orcs, ip);
}
#else
static struct orc_entry *orc_module_find(unsigned long ip)
{
return NULL;
}
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
static struct orc_entry *orc_find(unsigned long ip);
/*
* Ftrace dynamic trampolines do not have orc entries of their own.
* But they are copies of the ftrace entries that are static and
* defined in ftrace_*.S, which do have orc entries.
*
* If the unwinder comes across a ftrace trampoline, then find the
* ftrace function that was used to create it, and use that ftrace
* function's orc entry, as the placement of the return code in
* the stack will be identical.
*/
static struct orc_entry *orc_ftrace_find(unsigned long ip)
{
struct ftrace_ops *ops;
unsigned long tramp_addr, offset;
ops = ftrace_ops_trampoline(ip);
if (!ops)
return NULL;
/* Set tramp_addr to the start of the code copied by the trampoline */
if (ops->flags & FTRACE_OPS_FL_SAVE_REGS)
tramp_addr = (unsigned long)ftrace_regs_caller;
else
tramp_addr = (unsigned long)ftrace_caller;
/* Now place tramp_addr to the location within the trampoline ip is at */
offset = ip - ops->trampoline;
tramp_addr += offset;
/* Prevent unlikely recursion */
if (ip == tramp_addr)
return NULL;
return orc_find(tramp_addr);
}
#else
static struct orc_entry *orc_ftrace_find(unsigned long ip)
{
return NULL;
}
#endif
static struct orc_entry *orc_find(unsigned long ip)
{
static struct orc_entry *orc;
if (ip == 0)
return &orc_null_entry;
/* For non-init vmlinux addresses, use the fast lookup table: */
if (ip >= LOOKUP_START_IP && ip < LOOKUP_STOP_IP) {
unsigned int idx, start, stop;
idx = (ip - LOOKUP_START_IP) / LOOKUP_BLOCK_SIZE;
if (unlikely((idx >= lookup_num_blocks-1))) {
orc_warn("WARNING: bad lookup idx: idx=%u num=%u ip=%pB\n",
idx, lookup_num_blocks, (void *)ip);
return NULL;
}
start = orc_lookup[idx];
stop = orc_lookup[idx + 1] + 1;
if (unlikely((__start_orc_unwind + start >= __stop_orc_unwind) ||
(__start_orc_unwind + stop > __stop_orc_unwind))) {
orc_warn("WARNING: bad lookup value: idx=%u num=%u start=%u stop=%u ip=%pB\n",
idx, lookup_num_blocks, start, stop, (void *)ip);
return NULL;
}
return __orc_find(__start_orc_unwind_ip + start,
__start_orc_unwind + start, stop - start, ip);
}
/* vmlinux .init slow lookup: */
if (is_kernel_inittext(ip))
return __orc_find(__start_orc_unwind_ip, __start_orc_unwind,
__stop_orc_unwind_ip - __start_orc_unwind_ip, ip);
/* Module lookup: */
orc = orc_module_find(ip);
if (orc)
return orc;
return orc_ftrace_find(ip);
}
#ifdef CONFIG_MODULES
static DEFINE_MUTEX(sort_mutex);
static int *cur_orc_ip_table = __start_orc_unwind_ip;
static struct orc_entry *cur_orc_table = __start_orc_unwind;
static void orc_sort_swap(void *_a, void *_b, int size)
{
int delta = _b - _a;
int *a = _a, *b = _b, tmp;
struct orc_entry *orc_a, *orc_b;
/* Swap the .orc_unwind_ip entries: */
tmp = *a;
*a = *b + delta;
*b = tmp - delta;
/* Swap the corresponding .orc_unwind entries: */
orc_a = cur_orc_table + (a - cur_orc_ip_table);
orc_b = cur_orc_table + (b - cur_orc_ip_table);
swap(*orc_a, *orc_b);
}
static int orc_sort_cmp(const void *_a, const void *_b)
{
const int *a = _a, *b = _b;
unsigned long a_val = orc_ip(a);
unsigned long b_val = orc_ip(b);
struct orc_entry *orc_a;
if (a_val > b_val)
return 1;
if (a_val < b_val)
return -1;
/*
* The "weak" section terminator entries need to always be first
* to ensure the lookup code skips them in favor of real entries.
* These terminator entries exist to handle any gaps created by
* whitelisted .o files which didn't get objtool generation.
*/
orc_a = cur_orc_table + (a - cur_orc_ip_table);
return orc_a->type == ORC_TYPE_UNDEFINED ? -1 : 1;
}
void unwind_module_init(struct module *mod, void *_orc_ip, size_t orc_ip_size,
void *_orc, size_t orc_size)
{
int *orc_ip = _orc_ip;
struct orc_entry *orc = _orc;
unsigned int num_entries = orc_ip_size / sizeof(int);
WARN_ON_ONCE(orc_ip_size % sizeof(int) != 0 ||
orc_size % sizeof(*orc) != 0 ||
num_entries != orc_size / sizeof(*orc));
/*
* The 'cur_orc_*' globals allow the orc_sort_swap() callback to
* associate an .orc_unwind_ip table entry with its corresponding
* .orc_unwind entry so they can both be swapped.
*/
mutex_lock(&sort_mutex);
cur_orc_ip_table = orc_ip;
cur_orc_table = orc;
sort(orc_ip, num_entries, sizeof(int), orc_sort_cmp, orc_sort_swap);
mutex_unlock(&sort_mutex);
mod->arch.orc_unwind_ip = orc_ip;
mod->arch.orc_unwind = orc;
mod->arch.num_orcs = num_entries;
}
#endif
void __init unwind_init(void)
{
int i;
size_t orc_size = (void *)__stop_orc_unwind - (void *)__start_orc_unwind;
size_t orc_ip_size = (void *)__stop_orc_unwind_ip - (void *)__start_orc_unwind_ip;
size_t num_entries = orc_ip_size / sizeof(int);
struct orc_entry *orc;
if (!num_entries || orc_ip_size % sizeof(int) != 0 ||
orc_size % sizeof(struct orc_entry) != 0 ||
num_entries != orc_size / sizeof(struct orc_entry)) {
orc_warn("WARNING: Bad or missing .orc_unwind table. Disabling unwinder.\n");
return;
}
/*
* Note, the orc_unwind and orc_unwind_ip tables were already
* sorted at build time via the 'sorttable' tool.
* It's ready for binary search straight away, no need to sort it.
*/
/* Initialize the fast lookup table: */
lookup_num_blocks = orc_lookup_end - orc_lookup;
for (i = 0; i < lookup_num_blocks-1; i++) {
orc = __orc_find(__start_orc_unwind_ip, __start_orc_unwind,
num_entries, LOOKUP_START_IP + (LOOKUP_BLOCK_SIZE * i));
if (!orc) {
orc_warn("WARNING: Corrupt .orc_unwind table. Disabling unwinder.\n");
return;
}
orc_lookup[i] = orc - __start_orc_unwind;
}
/* Initialize the ending block: */
orc = __orc_find(__start_orc_unwind_ip, __start_orc_unwind, num_entries, LOOKUP_STOP_IP);
if (!orc) {
orc_warn("WARNING: Corrupt .orc_unwind table. Disabling unwinder.\n");
return;
}
orc_lookup[lookup_num_blocks-1] = orc - __start_orc_unwind;
orc_init = true;
}
static inline bool on_stack(struct stack_info *info, unsigned long addr, size_t len)
{
unsigned long begin = info->begin;
unsigned long end = info->end;
return (info->type != STACK_TYPE_UNKNOWN &&
addr >= begin && addr < end && addr + len > begin && addr + len <= end);
}
static bool stack_access_ok(struct unwind_state *state, unsigned long addr, size_t len)
{
struct stack_info *info = &state->stack_info;
if (on_stack(info, addr, len))
return true;
return !get_stack_info(addr, state->task, info) && on_stack(info, addr, len);
}
unsigned long unwind_get_return_address(struct unwind_state *state)
{
return __unwind_get_return_address(state);
}
EXPORT_SYMBOL_GPL(unwind_get_return_address);
void unwind_start(struct unwind_state *state, struct task_struct *task,
struct pt_regs *regs)
{
__unwind_start(state, task, regs);
state->type = UNWINDER_ORC;
if (!unwind_done(state) && !__kernel_text_address(state->pc))
unwind_next_frame(state);
}
EXPORT_SYMBOL_GPL(unwind_start);
static bool is_entry_func(unsigned long addr)
{
extern u32 kernel_entry;
extern u32 kernel_entry_end;
return addr >= (unsigned long)&kernel_entry && addr < (unsigned long)&kernel_entry_end;
}
static inline unsigned long bt_address(unsigned long ra)
{
extern unsigned long eentry;
if (__kernel_text_address(ra))
return ra;
if (__module_text_address(ra))
return ra;
if (ra >= eentry && ra < eentry + EXCCODE_INT_END * VECSIZE) {
unsigned long func;
unsigned long type = (ra - eentry) / VECSIZE;
unsigned long offset = (ra - eentry) % VECSIZE;
switch (type) {
case 0 ... EXCCODE_INT_START - 1:
func = (unsigned long)exception_table[type];
break;
case EXCCODE_INT_START ... EXCCODE_INT_END:
func = (unsigned long)handle_vint;
break;
default:
func = (unsigned long)handle_reserved;
break;
}
return func + offset;
}
return ra;
}
bool unwind_next_frame(struct unwind_state *state)
{
unsigned long *p, pc;
struct pt_regs *regs;
struct orc_entry *orc;
struct stack_info *info = &state->stack_info;
if (unwind_done(state))
return false;
/* Don't let modules unload while we're reading their ORC data. */
preempt_disable();
if (is_entry_func(state->pc))
goto end;
orc = orc_find(state->pc);
if (!orc) {
/*
* As a fallback, try to assume this code uses a frame pointer.
* This is useful for generated code, like BPF, which ORC
* doesn't know about. This is just a guess, so the rest of
* the unwind is no longer considered reliable.
*/
orc = &orc_fp_entry;
state->error = true;
} else {
if (orc->type == ORC_TYPE_UNDEFINED)
goto err;
if (orc->type == ORC_TYPE_END_OF_STACK)
goto end;
}
switch (orc->sp_reg) {
case ORC_REG_SP:
if (info->type == STACK_TYPE_IRQ && state->sp == info->end)
orc->type = ORC_TYPE_REGS;
else
state->sp = state->sp + orc->sp_offset;
break;
case ORC_REG_FP:
state->sp = state->fp;
break;
default:
orc_warn("unknown SP base reg %d at %pB\n", orc->sp_reg, (void *)state->pc);
goto err;
}
switch (orc->fp_reg) {
case ORC_REG_PREV_SP:
p = (unsigned long *)(state->sp + orc->fp_offset);
if (!stack_access_ok(state, (unsigned long)p, sizeof(unsigned long)))
goto err;
state->fp = *p;
break;
case ORC_REG_UNDEFINED:
/* Nothing. */
break;
default:
orc_warn("unknown FP base reg %d at %pB\n", orc->fp_reg, (void *)state->pc);
goto err;
}
switch (orc->type) {
case ORC_TYPE_CALL:
if (orc->ra_reg == ORC_REG_PREV_SP) {
p = (unsigned long *)(state->sp + orc->ra_offset);
if (!stack_access_ok(state, (unsigned long)p, sizeof(unsigned long)))
goto err;
pc = unwind_graph_addr(state, *p, state->sp);
pc -= LOONGARCH_INSN_SIZE;
} else if (orc->ra_reg == ORC_REG_UNDEFINED) {
if (!state->ra || state->ra == state->pc)
goto err;
pc = unwind_graph_addr(state, state->ra, state->sp);
pc -= LOONGARCH_INSN_SIZE;
state->ra = 0;
} else {
orc_warn("unknown ra base reg %d at %pB\n", orc->ra_reg, (void *)state->pc);
goto err;
}
break;
case ORC_TYPE_REGS:
if (info->type == STACK_TYPE_IRQ && state->sp == info->end)
regs = (struct pt_regs *)info->next_sp;
else
regs = (struct pt_regs *)state->sp;
if (!stack_access_ok(state, (unsigned long)regs, sizeof(*regs)))
goto err;
if ((info->end == (unsigned long)regs + sizeof(*regs)) &&
!regs->regs[3] && !regs->regs[1])
goto end;
if (user_mode(regs))
goto end;
pc = regs->csr_era;
if (!__kernel_text_address(pc))
goto err;
state->sp = regs->regs[3];
state->ra = regs->regs[1];
state->fp = regs->regs[22];
get_stack_info(state->sp, state->task, info);
break;
default:
orc_warn("unknown .orc_unwind entry type %d at %pB\n", orc->type, (void *)state->pc);
goto err;
}
state->pc = bt_address(pc);
if (!state->pc) {
pr_err("cannot find unwind pc at %pK\n", (void *)pc);
goto err;
}
if (!__kernel_text_address(state->pc))
goto err;
preempt_enable();
return true;
err:
state->error = true;
end:
preempt_enable();
state->stack_info.type = STACK_TYPE_UNKNOWN;
return false;
}
EXPORT_SYMBOL_GPL(unwind_next_frame);

3
arch/loongarch/kernel/vmlinux.lds.S
View File

@ -2,6 +2,7 @@
#include <linux/sizes.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/orc_lookup.h>
#define PAGE_SIZE _PAGE_SIZE
#define RO_EXCEPTION_TABLE_ALIGN 4
@ -122,6 +123,8 @@ SECTIONS
}
#endif
ORC_UNWIND_TABLE
.sdata : {
*(.sdata)
}

9
arch/loongarch/kvm/switch.S
View File

@ -8,7 +8,7 @@
#include <asm/asmmacro.h>
#include <asm/loongarch.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
#include <asm/unwind_hints.h>
#define HGPR_OFFSET(x) (PT_R0 + 8*x)
#define GGPR_OFFSET(x) (KVM_ARCH_GGPR + 8*x)
@ -112,6 +112,7 @@
.text
.cfi_sections .debug_frame
SYM_CODE_START(kvm_exc_entry)
UNWIND_HINT_UNDEFINED
csrwr a2, KVM_TEMP_KS
csrrd a2, KVM_VCPU_KS
addi.d a2, a2, KVM_VCPU_ARCH
@ -273,3 +274,9 @@ SYM_FUNC_END(kvm_restore_lasx)
.section ".rodata"
SYM_DATA(kvm_exception_size, .quad kvm_exc_entry_end - kvm_exc_entry)
SYM_DATA(kvm_enter_guest_size, .quad kvm_enter_guest_end - kvm_enter_guest)
#ifdef CONFIG_CPU_HAS_LBT
STACK_FRAME_NON_STANDARD kvm_restore_fpu
STACK_FRAME_NON_STANDARD kvm_restore_lsx
STACK_FRAME_NON_STANDARD kvm_restore_lasx
#endif

3
arch/loongarch/lib/clear_user.S
View File

@ -10,6 +10,7 @@
#include <asm/asm-extable.h>
#include <asm/cpu.h>
#include <asm/regdef.h>
#include <asm/unwind_hints.h>
SYM_FUNC_START(__clear_user)
/*
@ -204,3 +205,5 @@ SYM_FUNC_START(__clear_user_fast)
_asm_extable 28b, .Lsmall_fixup
_asm_extable 29b, .Lexit
SYM_FUNC_END(__clear_user_fast)
STACK_FRAME_NON_STANDARD __clear_user_fast

3
arch/loongarch/lib/copy_user.S
View File

@ -10,6 +10,7 @@
#include <asm/asm-extable.h>
#include <asm/cpu.h>
#include <asm/regdef.h>
#include <asm/unwind_hints.h>
SYM_FUNC_START(__copy_user)
/*
@ -278,3 +279,5 @@ SYM_FUNC_START(__copy_user_fast)
_asm_extable 58b, .Lexit
_asm_extable 59b, .Lexit
SYM_FUNC_END(__copy_user_fast)
STACK_FRAME_NON_STANDARD __copy_user_fast

3
arch/loongarch/lib/memcpy.S
View File

@ -9,6 +9,7 @@
#include <asm/asmmacro.h>
#include <asm/cpu.h>
#include <asm/regdef.h>
#include <asm/unwind_hints.h>
.section .noinstr.text, "ax"
@ -197,3 +198,5 @@ SYM_FUNC_START(__memcpy_fast)
jr ra
SYM_FUNC_END(__memcpy_fast)
_ASM_NOKPROBE(__memcpy_fast)
STACK_FRAME_NON_STANDARD __memcpy_small

3
arch/loongarch/lib/memset.S
View File

@ -9,6 +9,7 @@
#include <asm/asmmacro.h>
#include <asm/cpu.h>
#include <asm/regdef.h>
#include <asm/unwind_hints.h>
.macro fill_to_64 r0
bstrins.d \r0, \r0, 15, 8
@ -166,3 +167,5 @@ SYM_FUNC_START(__memset_fast)
jr ra
SYM_FUNC_END(__memset_fast)
_ASM_NOKPROBE(__memset_fast)
STACK_FRAME_NON_STANDARD __memset_fast

27
arch/loongarch/mm/tlb.c
View File

@ -9,8 +9,9 @@
#include <linux/hugetlb.h>
#include <linux/export.h>
#include <asm/cpu.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
#include <asm/exception.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/tlb.h>
@ -266,24 +267,20 @@ static void setup_tlb_handler(int cpu)
setup_ptwalker();
local_flush_tlb_all();
if (cpu_has_ptw) {
exception_table[EXCCODE_TLBI] = handle_tlb_load_ptw;
exception_table[EXCCODE_TLBL] = handle_tlb_load_ptw;
exception_table[EXCCODE_TLBS] = handle_tlb_store_ptw;
exception_table[EXCCODE_TLBM] = handle_tlb_modify_ptw;
}
/* The tlb handlers are generated only once */
if (cpu == 0) {
memcpy((void *)tlbrentry, handle_tlb_refill, 0x80);
local_flush_icache_range(tlbrentry, tlbrentry + 0x80);
if (!cpu_has_ptw) {
set_handler(EXCCODE_TLBI * VECSIZE, handle_tlb_load, VECSIZE);
set_handler(EXCCODE_TLBL * VECSIZE, handle_tlb_load, VECSIZE);
set_handler(EXCCODE_TLBS * VECSIZE, handle_tlb_store, VECSIZE);
set_handler(EXCCODE_TLBM * VECSIZE, handle_tlb_modify, VECSIZE);
} else {
set_handler(EXCCODE_TLBI * VECSIZE, handle_tlb_load_ptw, VECSIZE);
set_handler(EXCCODE_TLBL * VECSIZE, handle_tlb_load_ptw, VECSIZE);
set_handler(EXCCODE_TLBS * VECSIZE, handle_tlb_store_ptw, VECSIZE);
set_handler(EXCCODE_TLBM * VECSIZE, handle_tlb_modify_ptw, VECSIZE);
}
set_handler(EXCCODE_TLBNR * VECSIZE, handle_tlb_protect, VECSIZE);
set_handler(EXCCODE_TLBNX * VECSIZE, handle_tlb_protect, VECSIZE);
set_handler(EXCCODE_TLBPE * VECSIZE, handle_tlb_protect, VECSIZE);
for (int i = EXCCODE_TLBL; i <= EXCCODE_TLBPE; i++)
set_handler(i * VECSIZE, exception_table[i], VECSIZE);
} else {
int vec_sz __maybe_unused;
void *addr __maybe_unused;

9
arch/loongarch/mm/tlbex.S
View File

@ -18,6 +18,7 @@
.macro tlb_do_page_fault, write
SYM_CODE_START(tlb_do_page_fault_\write)
UNWIND_HINT_UNDEFINED
SAVE_ALL
csrrd a2, LOONGARCH_CSR_BADV
move a0, sp
@ -32,6 +33,7 @@
tlb_do_page_fault 1
SYM_CODE_START(handle_tlb_protect)
UNWIND_HINT_UNDEFINED
BACKUP_T0T1
SAVE_ALL
move a0, sp
@ -44,6 +46,7 @@ SYM_CODE_START(handle_tlb_protect)
SYM_CODE_END(handle_tlb_protect)
SYM_CODE_START(handle_tlb_load)
UNWIND_HINT_UNDEFINED
csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1
csrwr ra, EXCEPTION_KS2
@ -190,6 +193,7 @@ nopage_tlb_load:
SYM_CODE_END(handle_tlb_load)
SYM_CODE_START(handle_tlb_load_ptw)
UNWIND_HINT_UNDEFINED
csrwr t0, LOONGARCH_CSR_KS0
csrwr t1, LOONGARCH_CSR_KS1
la_abs t0, tlb_do_page_fault_0
@ -197,6 +201,7 @@ SYM_CODE_START(handle_tlb_load_ptw)
SYM_CODE_END(handle_tlb_load_ptw)
SYM_CODE_START(handle_tlb_store)
UNWIND_HINT_UNDEFINED
csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1
csrwr ra, EXCEPTION_KS2
@ -346,6 +351,7 @@ nopage_tlb_store:
SYM_CODE_END(handle_tlb_store)
SYM_CODE_START(handle_tlb_store_ptw)
UNWIND_HINT_UNDEFINED
csrwr t0, LOONGARCH_CSR_KS0
csrwr t1, LOONGARCH_CSR_KS1
la_abs t0, tlb_do_page_fault_1
@ -353,6 +359,7 @@ SYM_CODE_START(handle_tlb_store_ptw)
SYM_CODE_END(handle_tlb_store_ptw)
SYM_CODE_START(handle_tlb_modify)
UNWIND_HINT_UNDEFINED
csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1
csrwr ra, EXCEPTION_KS2
@ -500,6 +507,7 @@ nopage_tlb_modify:
SYM_CODE_END(handle_tlb_modify)
SYM_CODE_START(handle_tlb_modify_ptw)
UNWIND_HINT_UNDEFINED
csrwr t0, LOONGARCH_CSR_KS0
csrwr t1, LOONGARCH_CSR_KS1
la_abs t0, tlb_do_page_fault_1
@ -507,6 +515,7 @@ SYM_CODE_START(handle_tlb_modify_ptw)
SYM_CODE_END(handle_tlb_modify_ptw)
SYM_CODE_START(handle_tlb_refill)
UNWIND_HINT_UNDEFINED
csrwr t0, LOONGARCH_CSR_TLBRSAVE
csrrd t0, LOONGARCH_CSR_PGD
lddir t0, t0, 3

1
arch/loongarch/vdso/Makefile
View File

@ -4,6 +4,7 @@
KASAN_SANITIZE := n
UBSAN_SANITIZE := n
KCOV_INSTRUMENT := n
OBJECT_FILES_NON_STANDARD := y
# Include the generic Makefile to check the built vdso.
include $(srctree)/lib/vdso/Makefile

9
include/linux/compiler.h
View File

@ -116,6 +116,14 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
*/
#define __stringify_label(n) #n
#define __annotate_reachable(c) ({ \
asm volatile(__stringify_label(c) ":\n\t" \
".pushsection .discard.reachable\n\t" \
".long " __stringify_label(c) "b - .\n\t" \
".popsection\n\t"); \
})
#define annotate_reachable() __annotate_reachable(__COUNTER__)
#define __annotate_unreachable(c) ({ \
asm volatile(__stringify_label(c) ":\n\t" \
".pushsection .discard.unreachable\n\t" \
@ -128,6 +136,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
#define __annotate_jump_table __section(".rodata..c_jump_table")
#else /* !CONFIG_OBJTOOL */
#define annotate_reachable()
#define annotate_unreachable()
#define __annotate_jump_table
#endif /* CONFIG_OBJTOOL */

7
scripts/Makefile
View File

@ -33,9 +33,12 @@ HOSTLDLIBS_sign-file = $(shell $(HOSTPKG_CONFIG) --libs libcrypto 2> /dev/null |
ifdef CONFIG_UNWINDER_ORC
ifeq ($(ARCH),x86_64)
ARCH := x86
SRCARCH := x86
endif
HOSTCFLAGS_sorttable.o += -I$(srctree)/tools/arch/x86/include
ifeq ($(ARCH),loongarch)
SRCARCH := loongarch
endif
HOSTCFLAGS_sorttable.o += -I$(srctree)/tools/arch/$(SRCARCH)/include
HOSTCFLAGS_sorttable.o += -DUNWINDER_ORC_ENABLED
endif

161
tools/arch/loongarch/include/asm/inst.h Normal file
View File

@ -0,0 +1,161 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_INST_H
#define _ASM_INST_H
#include <linux/bitops.h>
#define LOONGARCH_INSN_NOP 0x03400000
enum reg0i15_op {
break_op = 0x54,
};
enum reg0i26_op {
b_op = 0x14,
bl_op = 0x15,
};
enum reg1i21_op {
beqz_op = 0x10,
bnez_op = 0x11,
bceqz_op = 0x12, /* bits[9:8] = 0x00 */
bcnez_op = 0x12, /* bits[9:8] = 0x01 */
};
enum reg2_op {
ertn_op = 0x1920e,
};
enum reg2i12_op {
addid_op = 0x0b,
andi_op = 0x0d,
ldd_op = 0xa3,
std_op = 0xa7,
};
enum reg2i14_op {
ldptrd_op = 0x26,
stptrd_op = 0x27,
};
enum reg2i16_op {
jirl_op = 0x13,
beq_op = 0x16,
bne_op = 0x17,
blt_op = 0x18,
bge_op = 0x19,
bltu_op = 0x1a,
bgeu_op = 0x1b,
};
struct reg0i15_format {
unsigned int immediate : 15;
unsigned int opcode : 17;
};
struct reg0i26_format {
unsigned int immediate_h : 10;
unsigned int immediate_l : 16;
unsigned int opcode : 6;
};
struct reg1i21_format {
unsigned int immediate_h : 5;
unsigned int rj : 5;
unsigned int immediate_l : 16;
unsigned int opcode : 6;
};
struct reg2_format {
unsigned int rd : 5;
unsigned int rj : 5;
unsigned int opcode : 22;
};
struct reg2i12_format {
unsigned int rd : 5;
unsigned int rj : 5;
unsigned int immediate : 12;
unsigned int opcode : 10;
};
struct reg2i14_format {
unsigned int rd : 5;
unsigned int rj : 5;
unsigned int immediate : 14;
unsigned int opcode : 8;
};
struct reg2i16_format {
unsigned int rd : 5;
unsigned int rj : 5;
unsigned int immediate : 16;
unsigned int opcode : 6;
};
union loongarch_instruction {
unsigned int word;
struct reg0i15_format reg0i15_format;
struct reg0i26_format reg0i26_format;
struct reg1i21_format reg1i21_format;
struct reg2_format reg2_format;
struct reg2i12_format reg2i12_format;
struct reg2i14_format reg2i14_format;
struct reg2i16_format reg2i16_format;
};
#define LOONGARCH_INSN_SIZE sizeof(union loongarch_instruction)
enum loongarch_gpr {
LOONGARCH_GPR_ZERO = 0,
LOONGARCH_GPR_RA = 1,
LOONGARCH_GPR_TP = 2,
LOONGARCH_GPR_SP = 3,
LOONGARCH_GPR_A0 = 4, /* Reused as V0 for return value */
LOONGARCH_GPR_A1, /* Reused as V1 for return value */
LOONGARCH_GPR_A2,
LOONGARCH_GPR_A3,
LOONGARCH_GPR_A4,
LOONGARCH_GPR_A5,
LOONGARCH_GPR_A6,
LOONGARCH_GPR_A7,
LOONGARCH_GPR_T0 = 12,
LOONGARCH_GPR_T1,
LOONGARCH_GPR_T2,
LOONGARCH_GPR_T3,
LOONGARCH_GPR_T4,
LOONGARCH_GPR_T5,
LOONGARCH_GPR_T6,
LOONGARCH_GPR_T7,
LOONGARCH_GPR_T8,
LOONGARCH_GPR_FP = 22,
LOONGARCH_GPR_S0 = 23,
LOONGARCH_GPR_S1,
LOONGARCH_GPR_S2,
LOONGARCH_GPR_S3,
LOONGARCH_GPR_S4,
LOONGARCH_GPR_S5,
LOONGARCH_GPR_S6,
LOONGARCH_GPR_S7,
LOONGARCH_GPR_S8,
LOONGARCH_GPR_MAX
};
#define DEF_EMIT_REG2I16_FORMAT(NAME, OP) \
static inline void emit_##NAME(union loongarch_instruction *insn, \
enum loongarch_gpr rj, \
enum loongarch_gpr rd, \
int offset) \
{ \
insn->reg2i16_format.opcode = OP; \
insn->reg2i16_format.immediate = offset; \
insn->reg2i16_format.rj = rj; \
insn->reg2i16_format.rd = rd; \
}
DEF_EMIT_REG2I16_FORMAT(jirl, jirl_op)
#endif /* _ASM_INST_H */

58
tools/arch/loongarch/include/asm/orc_types.h Normal file
View File

@ -0,0 +1,58 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ORC_TYPES_H
#define _ORC_TYPES_H
#include <linux/types.h>
/*
* The ORC_REG_* registers are base registers which are used to find other
* registers on the stack.
*
* ORC_REG_PREV_SP, also known as DWARF Call Frame Address (CFA), is the
* address of the previous frame: the caller's SP before it called the current
* function.
*
* ORC_REG_UNDEFINED means the corresponding register's value didn't change in
* the current frame.
*
* The most commonly used base registers are SP and FP -- which the previous SP
* is usually based on -- and PREV_SP and UNDEFINED -- which the previous FP is
* usually based on.
*
* The rest of the base registers are needed for special cases like entry code
* and GCC realigned stacks.
*/
#define ORC_REG_UNDEFINED 0
#define ORC_REG_PREV_SP 1
#define ORC_REG_SP 2
#define ORC_REG_FP 3
#define ORC_REG_MAX 4
#define ORC_TYPE_UNDEFINED 0
#define ORC_TYPE_END_OF_STACK 1
#define ORC_TYPE_CALL 2
#define ORC_TYPE_REGS 3
#define ORC_TYPE_REGS_PARTIAL 4
#ifndef __ASSEMBLY__
/*
* This struct is more or less a vastly simplified version of the DWARF Call
* Frame Information standard. It contains only the necessary parts of DWARF
* CFI, simplified for ease of access by the in-kernel unwinder. It tells the
* unwinder how to find the previous SP and FP (and sometimes entry regs) on
* the stack for a given code address. Each instance of the struct corresponds
* to one or more code locations.
*/
struct orc_entry {
s16 sp_offset;
s16 fp_offset;
s16 ra_offset;
unsigned int sp_reg:4;
unsigned int fp_reg:4;
unsigned int ra_reg:4;
unsigned int type:3;
unsigned int signal:1;
};
#endif /* __ASSEMBLY__ */
#endif /* _ORC_TYPES_H */

11
tools/include/linux/bitops.h
View File

@ -87,4 +87,15 @@ static inline __u32 rol32(__u32 word, unsigned int shift)
return (word << shift) | (word >> ((-shift) & 31));
}
/**
* sign_extend64 - sign extend a 64-bit value using specified bit as sign-bit
* @value: value to sign extend
* @index: 0 based bit index (0<=index<64) to sign bit
*/
static __always_inline __s64 sign_extend64(__u64 value, int index)
{
__u8 shift = 63 - index;
return (__s64)(value << shift) >> shift;
}
#endif

4
tools/objtool/Makefile
View File

@ -57,6 +57,10 @@ ifeq ($(SRCARCH),x86)
BUILD_ORC := y
endif
ifeq ($(SRCARCH),loongarch)
BUILD_ORC := y
endif
export BUILD_ORC
export srctree OUTPUT CFLAGS SRCARCH AWK
include $(srctree)/tools/build/Makefile.include

3
tools/objtool/arch/loongarch/Build Normal file
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objtool-y += decode.o
objtool-y += special.o
objtool-y += orc.o

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// SPDX-License-Identifier: GPL-2.0-or-later
#include <string.h>
#include <objtool/check.h>
#include <objtool/warn.h>
#include <asm/inst.h>
#include <asm/orc_types.h>
#include <linux/objtool_types.h>
#ifndef EM_LOONGARCH
#define EM_LOONGARCH 258
#endif
int arch_ftrace_match(char *name)
{
return !strcmp(name, "_mcount");
}
unsigned long arch_jump_destination(struct instruction *insn)
{
return insn->offset + (insn->immediate << 2);
}
unsigned long arch_dest_reloc_offset(int addend)
{
return addend;
}
bool arch_pc_relative_reloc(struct reloc *reloc)
{
return false;
}
bool arch_callee_saved_reg(unsigned char reg)
{
switch (reg) {
case CFI_RA:
case CFI_FP:
case CFI_S0 ... CFI_S8:
return true;
default:
return false;
}
}
int arch_decode_hint_reg(u8 sp_reg, int *base)
{
switch (sp_reg) {
case ORC_REG_UNDEFINED:
*base = CFI_UNDEFINED;
break;
case ORC_REG_SP:
*base = CFI_SP;
break;
case ORC_REG_FP:
*base = CFI_FP;
break;
default:
return -1;
}
return 0;
}
static bool is_loongarch(const struct elf *elf)
{
if (elf->ehdr.e_machine == EM_LOONGARCH)
return true;
WARN("unexpected ELF machine type %d", elf->ehdr.e_machine);
return false;
}
#define ADD_OP(op) \
if (!(op = calloc(1, sizeof(*op)))) \
return -1; \
else for (*ops_list = op, ops_list = &op->next; op; op = NULL)
static bool decode_insn_reg0i26_fomat(union loongarch_instruction inst,
struct instruction *insn)
{
switch (inst.reg0i26_format.opcode) {
case b_op:
insn->type = INSN_JUMP_UNCONDITIONAL;
insn->immediate = sign_extend64(inst.reg0i26_format.immediate_h << 16 |
inst.reg0i26_format.immediate_l, 25);
break;
case bl_op:
insn->type = INSN_CALL;
insn->immediate = sign_extend64(inst.reg0i26_format.immediate_h << 16 |
inst.reg0i26_format.immediate_l, 25);
break;
default:
return false;
}
return true;
}
static bool decode_insn_reg1i21_fomat(union loongarch_instruction inst,
struct instruction *insn)
{
switch (inst.reg1i21_format.opcode) {
case beqz_op:
case bnez_op:
case bceqz_op:
insn->type = INSN_JUMP_CONDITIONAL;
insn->immediate = sign_extend64(inst.reg1i21_format.immediate_h << 16 |
inst.reg1i21_format.immediate_l, 20);
break;
default:
return false;
}
return true;
}
static bool decode_insn_reg2i12_fomat(union loongarch_instruction inst,
struct instruction *insn,
struct stack_op **ops_list,
struct stack_op *op)
{
switch (inst.reg2i12_format.opcode) {
case addid_op:
if ((inst.reg2i12_format.rd == CFI_SP) || (inst.reg2i12_format.rj == CFI_SP)) {
/* addi.d sp,sp,si12 or addi.d fp,sp,si12 */
insn->immediate = sign_extend64(inst.reg2i12_format.immediate, 11);
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = inst.reg2i12_format.rj;
op->src.offset = insn->immediate;
op->dest.type = OP_DEST_REG;
op->dest.reg = inst.reg2i12_format.rd;
}
}
break;
case ldd_op:
if (inst.reg2i12_format.rj == CFI_SP) {
/* ld.d rd,sp,si12 */
insn->immediate = sign_extend64(inst.reg2i12_format.immediate, 11);
ADD_OP(op) {
op->src.type = OP_SRC_REG_INDIRECT;
op->src.reg = CFI_SP;
op->src.offset = insn->immediate;
op->dest.type = OP_DEST_REG;
op->dest.reg = inst.reg2i12_format.rd;
}
}
break;
case std_op:
if (inst.reg2i12_format.rj == CFI_SP) {
/* st.d rd,sp,si12 */
insn->immediate = sign_extend64(inst.reg2i12_format.immediate, 11);
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = inst.reg2i12_format.rd;
op->dest.type = OP_DEST_REG_INDIRECT;
op->dest.reg = CFI_SP;
op->dest.offset = insn->immediate;
}
}
break;
case andi_op:
if (inst.reg2i12_format.rd == 0 &&
inst.reg2i12_format.rj == 0 &&
inst.reg2i12_format.immediate == 0)
/* andi r0,r0,0 */
insn->type = INSN_NOP;
break;
default:
return false;
}
return true;
}
static bool decode_insn_reg2i14_fomat(union loongarch_instruction inst,
struct instruction *insn,
struct stack_op **ops_list,
struct stack_op *op)
{
switch (inst.reg2i14_format.opcode) {
case ldptrd_op:
if (inst.reg2i14_format.rj == CFI_SP) {
/* ldptr.d rd,sp,si14 */
insn->immediate = sign_extend64(inst.reg2i14_format.immediate, 13);
ADD_OP(op) {
op->src.type = OP_SRC_REG_INDIRECT;
op->src.reg = CFI_SP;
op->src.offset = insn->immediate;
op->dest.type = OP_DEST_REG;
op->dest.reg = inst.reg2i14_format.rd;
}
}
break;
case stptrd_op:
if (inst.reg2i14_format.rj == CFI_SP) {
/* stptr.d ra,sp,0 */
if (inst.reg2i14_format.rd == LOONGARCH_GPR_RA &&
inst.reg2i14_format.immediate == 0)
break;
/* stptr.d rd,sp,si14 */
insn->immediate = sign_extend64(inst.reg2i14_format.immediate, 13);
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = inst.reg2i14_format.rd;
op->dest.type = OP_DEST_REG_INDIRECT;
op->dest.reg = CFI_SP;
op->dest.offset = insn->immediate;
}
}
break;
default:
return false;
}
return true;
}
static bool decode_insn_reg2i16_fomat(union loongarch_instruction inst,
struct instruction *insn)
{
switch (inst.reg2i16_format.opcode) {
case jirl_op:
if (inst.reg2i16_format.rd == 0 &&
inst.reg2i16_format.rj == CFI_RA &&
inst.reg2i16_format.immediate == 0) {
/* jirl r0,ra,0 */
insn->type = INSN_RETURN;
} else if (inst.reg2i16_format.rd == CFI_RA) {
/* jirl ra,rj,offs16 */
insn->type = INSN_CALL_DYNAMIC;
} else if (inst.reg2i16_format.rd == CFI_A0 &&
inst.reg2i16_format.immediate == 0) {
/*
* jirl a0,t0,0
* this is a special case in loongarch_suspend_enter,
* just treat it as a call instruction.
*/
insn->type = INSN_CALL_DYNAMIC;
} else if (inst.reg2i16_format.rd == 0 &&
inst.reg2i16_format.immediate == 0) {
/* jirl r0,rj,0 */
insn->type = INSN_JUMP_DYNAMIC;
} else if (inst.reg2i16_format.rd == 0 &&
inst.reg2i16_format.immediate != 0) {
/*
* jirl r0,t0,12
* this is a rare case in JUMP_VIRT_ADDR,
* just ignore it due to it is harmless for tracing.
*/
break;
} else {
/* jirl rd,rj,offs16 */
insn->type = INSN_JUMP_UNCONDITIONAL;
insn->immediate = sign_extend64(inst.reg2i16_format.immediate, 15);
}
break;
case beq_op:
case bne_op:
case blt_op:
case bge_op:
case bltu_op:
case bgeu_op:
insn->type = INSN_JUMP_CONDITIONAL;
insn->immediate = sign_extend64(inst.reg2i16_format.immediate, 15);
break;
default:
return false;
}
return true;
}
int arch_decode_instruction(struct objtool_file *file, const struct section *sec,
unsigned long offset, unsigned int maxlen,
struct instruction *insn)
{
struct stack_op **ops_list = &insn->stack_ops;
const struct elf *elf = file->elf;
struct stack_op *op = NULL;
union loongarch_instruction inst;
if (!is_loongarch(elf))
return -1;
if (maxlen < LOONGARCH_INSN_SIZE)
return 0;
insn->len = LOONGARCH_INSN_SIZE;
insn->type = INSN_OTHER;
insn->immediate = 0;
inst = *(union loongarch_instruction *)(sec->data->d_buf + offset);
if (decode_insn_reg0i26_fomat(inst, insn))
return 0;
if (decode_insn_reg1i21_fomat(inst, insn))
return 0;
if (decode_insn_reg2i12_fomat(inst, insn, ops_list, op))
return 0;
if (decode_insn_reg2i14_fomat(inst, insn, ops_list, op))
return 0;
if (decode_insn_reg2i16_fomat(inst, insn))
return 0;
if (inst.word == 0)
insn->type = INSN_NOP;
else if (inst.reg0i15_format.opcode == break_op) {
/* break */
insn->type = INSN_BUG;
} else if (inst.reg2_format.opcode == ertn_op) {
/* ertn */
insn->type = INSN_RETURN;
}
return 0;
}
const char *arch_nop_insn(int len)
{
static u32 nop;
if (len != LOONGARCH_INSN_SIZE)
WARN("invalid NOP size: %d\n", len);
nop = LOONGARCH_INSN_NOP;
return (const char *)&nop;
}
const char *arch_ret_insn(int len)
{
static u32 ret;
if (len != LOONGARCH_INSN_SIZE)
WARN("invalid RET size: %d\n", len);
emit_jirl((union loongarch_instruction *)&ret, LOONGARCH_GPR_RA, LOONGARCH_GPR_ZERO, 0);
return (const char *)&ret;
}
void arch_initial_func_cfi_state(struct cfi_init_state *state)
{
int i;
for (i = 0; i < CFI_NUM_REGS; i++) {
state->regs[i].base = CFI_UNDEFINED;
state->regs[i].offset = 0;
}
/* initial CFA (call frame address) */
state->cfa.base = CFI_SP;
state->cfa.offset = 0;
}

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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _OBJTOOL_ARCH_CFI_REGS_H
#define _OBJTOOL_ARCH_CFI_REGS_H
#define CFI_RA 1
#define CFI_SP 3
#define CFI_A0 4
#define CFI_FP 22
#define CFI_S0 23
#define CFI_S1 24
#define CFI_S2 25
#define CFI_S3 26
#define CFI_S4 27
#define CFI_S5 28
#define CFI_S6 29
#define CFI_S7 30
#define CFI_S8 31
#define CFI_NUM_REGS 32
#define CFI_BP CFI_FP
#endif /* _OBJTOOL_ARCH_CFI_REGS_H */

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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _OBJTOOL_ARCH_ELF_H
#define _OBJTOOL_ARCH_ELF_H
/*
* See the following link for more info about ELF Relocation types:
* https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html#_relocations
*/
#ifndef R_LARCH_NONE
#define R_LARCH_NONE 0
#endif
#ifndef R_LARCH_32
#define R_LARCH_32 1
#endif
#ifndef R_LARCH_64
#define R_LARCH_64 2
#endif
#ifndef R_LARCH_32_PCREL
#define R_LARCH_32_PCREL 99
#endif
#define R_NONE R_LARCH_NONE
#define R_ABS32 R_LARCH_32
#define R_ABS64 R_LARCH_64
#define R_DATA32 R_LARCH_32_PCREL
#define R_DATA64 R_LARCH_32_PCREL
#define R_TEXT32 R_LARCH_32_PCREL
#define R_TEXT64 R_LARCH_32_PCREL
#endif /* _OBJTOOL_ARCH_ELF_H */

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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _OBJTOOL_ARCH_SPECIAL_H
#define _OBJTOOL_ARCH_SPECIAL_H
/*
* See more info about struct exception_table_entry
* in arch/loongarch/include/asm/extable.h
*/
#define EX_ENTRY_SIZE 12
#define EX_ORIG_OFFSET 0
#define EX_NEW_OFFSET 4
/*
* See more info about struct jump_entry
* in include/linux/jump_label.h
*/
#define JUMP_ENTRY_SIZE 16
#define JUMP_ORIG_OFFSET 0
#define JUMP_NEW_OFFSET 4
#define JUMP_KEY_OFFSET 8
/*
* See more info about struct alt_instr
* in arch/loongarch/include/asm/alternative.h
*/
#define ALT_ENTRY_SIZE 12
#define ALT_ORIG_OFFSET 0
#define ALT_NEW_OFFSET 4
#define ALT_FEATURE_OFFSET 8
#define ALT_ORIG_LEN_OFFSET 10
#define ALT_NEW_LEN_OFFSET 11
#endif /* _OBJTOOL_ARCH_SPECIAL_H */

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// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/objtool_types.h>
#include <asm/orc_types.h>
#include <objtool/check.h>
#include <objtool/orc.h>
#include <objtool/warn.h>
#include <objtool/endianness.h>
int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi, struct instruction *insn)
{
struct cfi_reg *fp = &cfi->regs[CFI_FP];
struct cfi_reg *ra = &cfi->regs[CFI_RA];
memset(orc, 0, sizeof(*orc));
if (!cfi) {
/*
* This is usually either unreachable nops/traps (which don't
* trigger unreachable instruction warnings), or
* STACK_FRAME_NON_STANDARD functions.
*/
orc->type = ORC_TYPE_UNDEFINED;
return 0;
}
switch (cfi->type) {
case UNWIND_HINT_TYPE_UNDEFINED:
orc->type = ORC_TYPE_UNDEFINED;
return 0;
case UNWIND_HINT_TYPE_END_OF_STACK:
orc->type = ORC_TYPE_END_OF_STACK;
return 0;
case UNWIND_HINT_TYPE_CALL:
orc->type = ORC_TYPE_CALL;
break;
case UNWIND_HINT_TYPE_REGS:
orc->type = ORC_TYPE_REGS;
break;
case UNWIND_HINT_TYPE_REGS_PARTIAL:
orc->type = ORC_TYPE_REGS_PARTIAL;
break;
default:
WARN_INSN(insn, "unknown unwind hint type %d", cfi->type);
return -1;
}
orc->signal = cfi->signal;
switch (cfi->cfa.base) {
case CFI_SP:
orc->sp_reg = ORC_REG_SP;
break;
case CFI_FP:
orc->sp_reg = ORC_REG_FP;
break;
default:
WARN_INSN(insn, "unknown CFA base reg %d", cfi->cfa.base);
return -1;
}
switch (fp->base) {
case CFI_UNDEFINED:
orc->fp_reg = ORC_REG_UNDEFINED;
orc->fp_offset = 0;
break;
case CFI_CFA:
orc->fp_reg = ORC_REG_PREV_SP;
orc->fp_offset = fp->offset;
break;
case CFI_FP:
orc->fp_reg = ORC_REG_FP;
break;
default:
WARN_INSN(insn, "unknown FP base reg %d", fp->base);
return -1;
}
switch (ra->base) {
case CFI_UNDEFINED:
orc->ra_reg = ORC_REG_UNDEFINED;
orc->ra_offset = 0;
break;
case CFI_CFA:
orc->ra_reg = ORC_REG_PREV_SP;
orc->ra_offset = ra->offset;
break;
case CFI_FP:
orc->ra_reg = ORC_REG_FP;
break;
default:
WARN_INSN(insn, "unknown RA base reg %d", ra->base);
return -1;
}
orc->sp_offset = cfi->cfa.offset;
return 0;
}
int write_orc_entry(struct elf *elf, struct section *orc_sec,
struct section *ip_sec, unsigned int idx,
struct section *insn_sec, unsigned long insn_off,
struct orc_entry *o)
{
struct orc_entry *orc;
/* populate ORC data */
orc = (struct orc_entry *)orc_sec->data->d_buf + idx;
memcpy(orc, o, sizeof(*orc));
/* populate reloc for ip */
if (!elf_init_reloc_text_sym(elf, ip_sec, idx * sizeof(int), idx,
insn_sec, insn_off))
return -1;
return 0;
}
static const char *reg_name(unsigned int reg)
{
switch (reg) {
case ORC_REG_SP:
return "sp";
case ORC_REG_FP:
return "fp";
case ORC_REG_PREV_SP:
return "prevsp";
default:
return "?";
}
}
static const char *orc_type_name(unsigned int type)
{
switch (type) {
case UNWIND_HINT_TYPE_CALL:
return "call";
case UNWIND_HINT_TYPE_REGS:
return "regs";
case UNWIND_HINT_TYPE_REGS_PARTIAL:
return "regs (partial)";
default:
return "?";
}
}
static void print_reg(unsigned int reg, int offset)
{
if (reg == ORC_REG_UNDEFINED)
printf(" (und) ");
else
printf("%s + %3d", reg_name(reg), offset);
}
void orc_print_dump(struct elf *dummy_elf, struct orc_entry *orc, int i)
{
printf("type:%s", orc_type_name(orc[i].type));
printf(" sp:");
print_reg(orc[i].sp_reg, orc[i].sp_offset);
printf(" fp:");
print_reg(orc[i].fp_reg, orc[i].fp_offset);
printf(" ra:");
print_reg(orc[i].ra_reg, orc[i].ra_offset);
printf(" signal:%d\n", orc[i].signal);
}

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// SPDX-License-Identifier: GPL-2.0-or-later
#include <objtool/special.h>
bool arch_support_alt_relocation(struct special_alt *special_alt,
struct instruction *insn,
struct reloc *reloc)
{
return false;
}
struct reloc *arch_find_switch_table(struct objtool_file *file,
struct instruction *insn)
{
return NULL;
}

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tools/objtool/arch/x86/Build
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objtool-y += special.o
objtool-y += decode.o
objtool-y += orc.o
inat_tables_script = ../arch/x86/tools/gen-insn-attr-x86.awk
inat_tables_maps = ../arch/x86/lib/x86-opcode-map.txt

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// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/objtool_types.h>
#include <asm/orc_types.h>
#include <objtool/check.h>
#include <objtool/orc.h>
#include <objtool/warn.h>
#include <objtool/endianness.h>
int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi, struct instruction *insn)
{
struct cfi_reg *bp = &cfi->regs[CFI_BP];
memset(orc, 0, sizeof(*orc));
if (!cfi) {
/*
* This is usually either unreachable nops/traps (which don't
* trigger unreachable instruction warnings), or
* STACK_FRAME_NON_STANDARD functions.
*/
orc->type = ORC_TYPE_UNDEFINED;
return 0;
}
switch (cfi->type) {
case UNWIND_HINT_TYPE_UNDEFINED:
orc->type = ORC_TYPE_UNDEFINED;
return 0;
case UNWIND_HINT_TYPE_END_OF_STACK:
orc->type = ORC_TYPE_END_OF_STACK;
return 0;
case UNWIND_HINT_TYPE_CALL:
orc->type = ORC_TYPE_CALL;
break;
case UNWIND_HINT_TYPE_REGS:
orc->type = ORC_TYPE_REGS;
break;
case UNWIND_HINT_TYPE_REGS_PARTIAL:
orc->type = ORC_TYPE_REGS_PARTIAL;
break;
default:
WARN_INSN(insn, "unknown unwind hint type %d", cfi->type);
return -1;
}
orc->signal = cfi->signal;
switch (cfi->cfa.base) {
case CFI_SP:
orc->sp_reg = ORC_REG_SP;
break;
case CFI_SP_INDIRECT:
orc->sp_reg = ORC_REG_SP_INDIRECT;
break;
case CFI_BP:
orc->sp_reg = ORC_REG_BP;
break;
case CFI_BP_INDIRECT:
orc->sp_reg = ORC_REG_BP_INDIRECT;
break;
case CFI_R10:
orc->sp_reg = ORC_REG_R10;
break;
case CFI_R13:
orc->sp_reg = ORC_REG_R13;
break;
case CFI_DI:
orc->sp_reg = ORC_REG_DI;
break;
case CFI_DX:
orc->sp_reg = ORC_REG_DX;
break;
default:
WARN_INSN(insn, "unknown CFA base reg %d", cfi->cfa.base);
return -1;
}
switch (bp->base) {
case CFI_UNDEFINED:
orc->bp_reg = ORC_REG_UNDEFINED;
break;
case CFI_CFA:
orc->bp_reg = ORC_REG_PREV_SP;
break;
case CFI_BP:
orc->bp_reg = ORC_REG_BP;
break;
default:
WARN_INSN(insn, "unknown BP base reg %d", bp->base);
return -1;
}
orc->sp_offset = cfi->cfa.offset;
orc->bp_offset = bp->offset;
return 0;
}
int write_orc_entry(struct elf *elf, struct section *orc_sec,
struct section *ip_sec, unsigned int idx,
struct section *insn_sec, unsigned long insn_off,
struct orc_entry *o)
{
struct orc_entry *orc;
/* populate ORC data */
orc = (struct orc_entry *)orc_sec->data->d_buf + idx;
memcpy(orc, o, sizeof(*orc));
orc->sp_offset = bswap_if_needed(elf, orc->sp_offset);
orc->bp_offset = bswap_if_needed(elf, orc->bp_offset);
/* populate reloc for ip */
if (!elf_init_reloc_text_sym(elf, ip_sec, idx * sizeof(int), idx,
insn_sec, insn_off))
return -1;
return 0;
}
static const char *reg_name(unsigned int reg)
{
switch (reg) {
case ORC_REG_PREV_SP:
return "prevsp";
case ORC_REG_DX:
return "dx";
case ORC_REG_DI:
return "di";
case ORC_REG_BP:
return "bp";
case ORC_REG_SP:
return "sp";
case ORC_REG_R10:
return "r10";
case ORC_REG_R13:
return "r13";
case ORC_REG_BP_INDIRECT:
return "bp(ind)";
case ORC_REG_SP_INDIRECT:
return "sp(ind)";
default:
return "?";
}
}
static const char *orc_type_name(unsigned int type)
{
switch (type) {
case ORC_TYPE_UNDEFINED:
return "(und)";
case ORC_TYPE_END_OF_STACK:
return "end";
case ORC_TYPE_CALL:
return "call";
case ORC_TYPE_REGS:
return "regs";
case ORC_TYPE_REGS_PARTIAL:
return "regs (partial)";
default:
return "?";
}
}
static void print_reg(unsigned int reg, int offset)
{
if (reg == ORC_REG_BP_INDIRECT)
printf("(bp%+d)", offset);
else if (reg == ORC_REG_SP_INDIRECT)
printf("(sp)%+d", offset);
else if (reg == ORC_REG_UNDEFINED)
printf("(und)");
else
printf("%s%+d", reg_name(reg), offset);
}
void orc_print_dump(struct elf *dummy_elf, struct orc_entry *orc, int i)
{
printf("type:%s", orc_type_name(orc[i].type));
printf(" sp:");
print_reg(orc[i].sp_reg, bswap_if_needed(dummy_elf, orc[i].sp_offset));
printf(" bp:");
print_reg(orc[i].bp_reg, bswap_if_needed(dummy_elf, orc[i].bp_offset));
printf(" signal:%d\n", orc[i].signal);
}

52
tools/objtool/check.c
View File

@ -20,6 +20,7 @@
#include <linux/hashtable.h>
#include <linux/kernel.h>
#include <linux/static_call_types.h>
#include <linux/string.h>
struct alternative {
struct alternative *next;
@ -584,7 +585,7 @@ static int add_dead_ends(struct objtool_file *file)
struct section *rsec;
struct reloc *reloc;
struct instruction *insn;
s64 addend;
unsigned long offset;
/*
* Check for manually annotated dead ends.
@ -594,27 +595,28 @@ static int add_dead_ends(struct objtool_file *file)
goto reachable;
for_each_reloc(rsec, reloc) {
if (reloc->sym->type != STT_SECTION) {
if (reloc->sym->type == STT_SECTION) {
offset = reloc_addend(reloc);
} else if (reloc->sym->local_label) {
offset = reloc->sym->offset;
} else {
WARN("unexpected relocation symbol type in %s", rsec->name);
return -1;
}
addend = reloc_addend(reloc);
insn = find_insn(file, reloc->sym->sec, addend);
insn = find_insn(file, reloc->sym->sec, offset);
if (insn)
insn = prev_insn_same_sec(file, insn);
else if (addend == reloc->sym->sec->sh.sh_size) {
else if (offset == reloc->sym->sec->sh.sh_size) {
insn = find_last_insn(file, reloc->sym->sec);
if (!insn) {
WARN("can't find unreachable insn at %s+0x%" PRIx64,
reloc->sym->sec->name, addend);
reloc->sym->sec->name, offset);
return -1;
}
} else {
WARN("can't find unreachable insn at %s+0x%" PRIx64,
reloc->sym->sec->name, addend);
reloc->sym->sec->name, offset);
return -1;
}
@ -633,27 +635,28 @@ reachable:
return 0;
for_each_reloc(rsec, reloc) {
if (reloc->sym->type != STT_SECTION) {
if (reloc->sym->type == STT_SECTION) {
offset = reloc_addend(reloc);
} else if (reloc->sym->local_label) {
offset = reloc->sym->offset;
} else {
WARN("unexpected relocation symbol type in %s", rsec->name);
return -1;
}
addend = reloc_addend(reloc);
insn = find_insn(file, reloc->sym->sec, addend);
insn = find_insn(file, reloc->sym->sec, offset);
if (insn)
insn = prev_insn_same_sec(file, insn);
else if (addend == reloc->sym->sec->sh.sh_size) {
else if (offset == reloc->sym->sec->sh.sh_size) {
insn = find_last_insn(file, reloc->sym->sec);
if (!insn) {
WARN("can't find reachable insn at %s+0x%" PRIx64,
reloc->sym->sec->name, addend);
reloc->sym->sec->name, offset);
return -1;
}
} else {
WARN("can't find reachable insn at %s+0x%" PRIx64,
reloc->sym->sec->name, addend);
reloc->sym->sec->name, offset);
return -1;
}
@ -2224,6 +2227,7 @@ static int read_unwind_hints(struct objtool_file *file)
struct unwind_hint *hint;
struct instruction *insn;
struct reloc *reloc;
unsigned long offset;
int i;
sec = find_section_by_name(file->elf, ".discard.unwind_hints");
@ -2251,7 +2255,16 @@ static int read_unwind_hints(struct objtool_file *file)
return -1;
}
insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
if (reloc->sym->type == STT_SECTION) {
offset = reloc_addend(reloc);
} else if (reloc->sym->local_label) {
offset = reloc->sym->offset;
} else {
WARN("unexpected relocation symbol type in %s", sec->rsec->name);
return -1;
}
insn = find_insn(file, reloc->sym->sec, offset);
if (!insn) {
WARN("can't find insn for unwind_hints[%d]", i);
return -1;
@ -2522,6 +2535,9 @@ static int classify_symbols(struct objtool_file *file)
struct symbol *func;
for_each_sym(file, func) {
if (func->type == STT_NOTYPE && strstarts(func->name, ".L"))
func->local_label = true;
if (func->bind != STB_GLOBAL)
continue;

1
tools/objtool/include/objtool/elf.h
View File

@ -67,6 +67,7 @@ struct symbol {
u8 profiling_func : 1;
u8 warned : 1;
u8 embedded_insn : 1;
u8 local_label : 1;
struct list_head pv_target;
struct reloc *relocs;
};

14
tools/objtool/include/objtool/orc.h Normal file
View File

@ -0,0 +1,14 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _OBJTOOL_ORC_H
#define _OBJTOOL_ORC_H
#include <objtool/check.h>
int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi, struct instruction *insn);
void orc_print_dump(struct elf *dummy_elf, struct orc_entry *orc, int i);
int write_orc_entry(struct elf *elf, struct section *orc_sec,
struct section *ip_sec, unsigned int idx,
struct section *insn_sec, unsigned long insn_off,
struct orc_entry *o);
#endif /* _OBJTOOL_ORC_H */

69
tools/objtool/orc_dump.c
View File

@ -6,65 +6,10 @@
#include <unistd.h>
#include <asm/orc_types.h>
#include <objtool/objtool.h>
#include <objtool/orc.h>
#include <objtool/warn.h>
#include <objtool/endianness.h>
static const char *reg_name(unsigned int reg)
{
switch (reg) {
case ORC_REG_PREV_SP:
return "prevsp";
case ORC_REG_DX:
return "dx";
case ORC_REG_DI:
return "di";
case ORC_REG_BP:
return "bp";
case ORC_REG_SP:
return "sp";
case ORC_REG_R10:
return "r10";
case ORC_REG_R13:
return "r13";
case ORC_REG_BP_INDIRECT:
return "bp(ind)";
case ORC_REG_SP_INDIRECT:
return "sp(ind)";
default:
return "?";
}
}
static const char *orc_type_name(unsigned int type)
{
switch (type) {
case ORC_TYPE_UNDEFINED:
return "(und)";
case ORC_TYPE_END_OF_STACK:
return "end";
case ORC_TYPE_CALL:
return "call";
case ORC_TYPE_REGS:
return "regs";
case ORC_TYPE_REGS_PARTIAL:
return "regs (partial)";
default:
return "?";
}
}
static void print_reg(unsigned int reg, int offset)
{
if (reg == ORC_REG_BP_INDIRECT)
printf("(bp%+d)", offset);
else if (reg == ORC_REG_SP_INDIRECT)
printf("(sp)%+d", offset);
else if (reg == ORC_REG_UNDEFINED)
printf("(und)");
else
printf("%s%+d", reg_name(reg), offset);
}
int orc_dump(const char *_objname)
{
int fd, nr_entries, i, *orc_ip = NULL, orc_size = 0;
@ -205,17 +150,7 @@ int orc_dump(const char *_objname)
printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i]));
}
printf("type:%s", orc_type_name(orc[i].type));
printf(" sp:");
print_reg(orc[i].sp_reg, bswap_if_needed(&dummy_elf, orc[i].sp_offset));
printf(" bp:");
print_reg(orc[i].bp_reg, bswap_if_needed(&dummy_elf, orc[i].bp_offset));
printf(" signal:%d\n", orc[i].signal);
orc_print_dump(&dummy_elf, orc, i);
}
elf_end(elf);

113
tools/objtool/orc_gen.c
View File

@ -10,121 +10,10 @@
#include <asm/orc_types.h>
#include <objtool/check.h>
#include <objtool/orc.h>
#include <objtool/warn.h>
#include <objtool/endianness.h>
static int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi,
struct instruction *insn)
{
struct cfi_reg *bp = &cfi->regs[CFI_BP];
memset(orc, 0, sizeof(*orc));
if (!cfi) {
/*
* This is usually either unreachable nops/traps (which don't
* trigger unreachable instruction warnings), or
* STACK_FRAME_NON_STANDARD functions.
*/
orc->type = ORC_TYPE_UNDEFINED;
return 0;
}
switch (cfi->type) {
case UNWIND_HINT_TYPE_UNDEFINED:
orc->type = ORC_TYPE_UNDEFINED;
return 0;
case UNWIND_HINT_TYPE_END_OF_STACK:
orc->type = ORC_TYPE_END_OF_STACK;
return 0;
case UNWIND_HINT_TYPE_CALL:
orc->type = ORC_TYPE_CALL;
break;
case UNWIND_HINT_TYPE_REGS:
orc->type = ORC_TYPE_REGS;
break;
case UNWIND_HINT_TYPE_REGS_PARTIAL:
orc->type = ORC_TYPE_REGS_PARTIAL;
break;
default:
WARN_INSN(insn, "unknown unwind hint type %d", cfi->type);
return -1;
}
orc->signal = cfi->signal;
switch (cfi->cfa.base) {
case CFI_SP:
orc->sp_reg = ORC_REG_SP;
break;
case CFI_SP_INDIRECT:
orc->sp_reg = ORC_REG_SP_INDIRECT;
break;
case CFI_BP:
orc->sp_reg = ORC_REG_BP;
break;
case CFI_BP_INDIRECT:
orc->sp_reg = ORC_REG_BP_INDIRECT;
break;
case CFI_R10:
orc->sp_reg = ORC_REG_R10;
break;
case CFI_R13:
orc->sp_reg = ORC_REG_R13;
break;
case CFI_DI:
orc->sp_reg = ORC_REG_DI;
break;
case CFI_DX:
orc->sp_reg = ORC_REG_DX;
break;
default:
WARN_INSN(insn, "unknown CFA base reg %d", cfi->cfa.base);
return -1;
}
switch (bp->base) {
case CFI_UNDEFINED:
orc->bp_reg = ORC_REG_UNDEFINED;
break;
case CFI_CFA:
orc->bp_reg = ORC_REG_PREV_SP;
break;
case CFI_BP:
orc->bp_reg = ORC_REG_BP;
break;
default:
WARN_INSN(insn, "unknown BP base reg %d", bp->base);
return -1;
}
orc->sp_offset = cfi->cfa.offset;
orc->bp_offset = bp->offset;
return 0;
}
static int write_orc_entry(struct elf *elf, struct section *orc_sec,
struct section *ip_sec, unsigned int idx,
struct section *insn_sec, unsigned long insn_off,
struct orc_entry *o)
{
struct orc_entry *orc;
/* populate ORC data */
orc = (struct orc_entry *)orc_sec->data->d_buf + idx;
memcpy(orc, o, sizeof(*orc));
orc->sp_offset = bswap_if_needed(elf, orc->sp_offset);
orc->bp_offset = bswap_if_needed(elf, orc->bp_offset);
/* populate reloc for ip */
if (!elf_init_reloc_text_sym(elf, ip_sec, idx * sizeof(int), idx,
insn_sec, insn_off))
return -1;
return 0;
}
struct orc_list_entry {
struct list_head list;
struct orc_entry orc;