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kernel-aes67/arch/loongarch/kernel/mcount.S

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LoongArch/ftrace: Add basic support This patch contains basic ftrace support for LoongArch. Specifically, function tracer (HAVE_FUNCTION_TRACER), function graph tracer (HAVE_ FUNCTION_GRAPH_TRACER) are implemented following the instructions in Documentation/trace/ftrace-design.txt. Use `-pg` makes stub like a child function `void _mcount(void *ra)`. Thus, it can be seen store RA and alloc stack before `call _mcount`. Find `alloc stack` at first, and then find `store RA`. Note that the functions in both inst.c and time.c should not be hooked with the compiler's -pg option: to prevent infinite self-referencing for the former, and to ignore early setup stuff for the latter. Co-developed-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-12-10 09:40:15 -05:00
/* SPDX-License-Identifier: GPL-2.0 */
/*
* LoongArch specific _mcount support
*
* Copyright (C) 2022 Loongson Technology Corporation Limited
*/
LoongArch: Replace #include <asm/export.h> with #include <linux/export.h> Commit ddb5cdbafaaad ("kbuild: generate KSYMTAB entries by modpost") deprecated <asm/export.h>, which is now a wrapper of <linux/export.h>. Replace #include <asm/export.h> with #include <linux/export.h>. After all the <asm/export.h> lines are converted, <asm/export.h> and <asm-generic/export.h> will be removed. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2023-08-25 11:40:26 -04:00
#include <linux/export.h>
LoongArch/ftrace: Add basic support This patch contains basic ftrace support for LoongArch. Specifically, function tracer (HAVE_FUNCTION_TRACER), function graph tracer (HAVE_ FUNCTION_GRAPH_TRACER) are implemented following the instructions in Documentation/trace/ftrace-design.txt. Use `-pg` makes stub like a child function `void _mcount(void *ra)`. Thus, it can be seen store RA and alloc stack before `call _mcount`. Find `alloc stack` at first, and then find `store RA`. Note that the functions in both inst.c and time.c should not be hooked with the compiler's -pg option: to prevent infinite self-referencing for the former, and to ignore early setup stuff for the latter. Co-developed-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-12-10 09:40:15 -05:00
#include <asm/ftrace.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
.text
#define MCOUNT_S0_OFFSET (0)
#define MCOUNT_RA_OFFSET (SZREG)
#define MCOUNT_STACK_SIZE (2 * SZREG)
.macro MCOUNT_SAVE_REGS
PTR_ADDI sp, sp, -MCOUNT_STACK_SIZE
PTR_S s0, sp, MCOUNT_S0_OFFSET
PTR_S ra, sp, MCOUNT_RA_OFFSET
move s0, a0
.endm
.macro MCOUNT_RESTORE_REGS
move a0, s0
PTR_L ra, sp, MCOUNT_RA_OFFSET
PTR_L s0, sp, MCOUNT_S0_OFFSET
PTR_ADDI sp, sp, MCOUNT_STACK_SIZE
.endm
SYM_FUNC_START(_mcount)
la.pcrel t1, ftrace_stub
la.pcrel t2, ftrace_trace_function /* Prepare t2 for (1) */
PTR_L t2, t2, 0
beq t1, t2, fgraph_trace
MCOUNT_SAVE_REGS
move a0, ra /* arg0: self return address */
move a1, s0 /* arg1: parent's return address */
jirl ra, t2, 0 /* (1) call *ftrace_trace_function */
MCOUNT_RESTORE_REGS
fgraph_trace:
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
la.pcrel t1, ftrace_stub
la.pcrel t3, ftrace_graph_return
PTR_L t3, t3, 0
bne t1, t3, ftrace_graph_caller
la.pcrel t1, ftrace_graph_entry_stub
la.pcrel t3, ftrace_graph_entry
PTR_L t3, t3, 0
bne t1, t3, ftrace_graph_caller
#endif
SYM_INNER_LABEL(ftrace_stub, SYM_L_GLOBAL)
jr ra
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
SYM_INNER_LABEL(ftrace_graph_func, SYM_L_GLOBAL)
bl ftrace_stub
#endif
SYM_FUNC_END(_mcount)
EXPORT_SYMBOL(_mcount)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
SYM_FUNC_START(ftrace_graph_caller)
MCOUNT_SAVE_REGS
PTR_ADDI a0, ra, -4 /* arg0: Callsite self return addr */
PTR_ADDI a1, sp, MCOUNT_STACK_SIZE /* arg1: Callsite sp */
move a2, s0 /* arg2: Callsite parent ra */
bl prepare_ftrace_return
MCOUNT_RESTORE_REGS
jr ra
SYM_FUNC_END(ftrace_graph_caller)
SYM_FUNC_START(return_to_handler)
LoongArch: ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL The previous patch ("function_graph: Support recording and printing the return value of function") has laid the groundwork for the for the funcgraph-retval, and this modification makes it available on the LoongArch platform. We introduce a new structure called fgraph_ret_regs for the LoongArch platform to hold return registers and the frame pointer. We then fill its content in the return_to_handler and pass its address to the function ftrace_return_to_handler to record the return value. Link: https://lkml.kernel.org/r/c5462255e435fab363895c2d7433bc0f5a140411.1680954589.git.pengdonglin@sangfor.com.cn Reviewed-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: Donglin Peng <pengdonglin@sangfor.com.cn> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2023-04-08 08:42:21 -04:00
PTR_ADDI sp, sp, -FGRET_REGS_SIZE
PTR_S a0, sp, FGRET_REGS_A0
PTR_S a1, sp, FGRET_REGS_A1
PTR_S zero, sp, FGRET_REGS_FP
LoongArch/ftrace: Add basic support This patch contains basic ftrace support for LoongArch. Specifically, function tracer (HAVE_FUNCTION_TRACER), function graph tracer (HAVE_ FUNCTION_GRAPH_TRACER) are implemented following the instructions in Documentation/trace/ftrace-design.txt. Use `-pg` makes stub like a child function `void _mcount(void *ra)`. Thus, it can be seen store RA and alloc stack before `call _mcount`. Find `alloc stack` at first, and then find `store RA`. Note that the functions in both inst.c and time.c should not be hooked with the compiler's -pg option: to prevent infinite self-referencing for the former, and to ignore early setup stuff for the latter. Co-developed-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-12-10 09:40:15 -05:00
LoongArch: ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL The previous patch ("function_graph: Support recording and printing the return value of function") has laid the groundwork for the for the funcgraph-retval, and this modification makes it available on the LoongArch platform. We introduce a new structure called fgraph_ret_regs for the LoongArch platform to hold return registers and the frame pointer. We then fill its content in the return_to_handler and pass its address to the function ftrace_return_to_handler to record the return value. Link: https://lkml.kernel.org/r/c5462255e435fab363895c2d7433bc0f5a140411.1680954589.git.pengdonglin@sangfor.com.cn Reviewed-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: Donglin Peng <pengdonglin@sangfor.com.cn> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2023-04-08 08:42:21 -04:00
move a0, sp
LoongArch/ftrace: Add basic support This patch contains basic ftrace support for LoongArch. Specifically, function tracer (HAVE_FUNCTION_TRACER), function graph tracer (HAVE_ FUNCTION_GRAPH_TRACER) are implemented following the instructions in Documentation/trace/ftrace-design.txt. Use `-pg` makes stub like a child function `void _mcount(void *ra)`. Thus, it can be seen store RA and alloc stack before `call _mcount`. Find `alloc stack` at first, and then find `store RA`. Note that the functions in both inst.c and time.c should not be hooked with the compiler's -pg option: to prevent infinite self-referencing for the former, and to ignore early setup stuff for the latter. Co-developed-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-12-10 09:40:15 -05:00
bl ftrace_return_to_handler
/* Restore the real parent address: a0 -> ra */
move ra, a0
LoongArch: ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL The previous patch ("function_graph: Support recording and printing the return value of function") has laid the groundwork for the for the funcgraph-retval, and this modification makes it available on the LoongArch platform. We introduce a new structure called fgraph_ret_regs for the LoongArch platform to hold return registers and the frame pointer. We then fill its content in the return_to_handler and pass its address to the function ftrace_return_to_handler to record the return value. Link: https://lkml.kernel.org/r/c5462255e435fab363895c2d7433bc0f5a140411.1680954589.git.pengdonglin@sangfor.com.cn Reviewed-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: Donglin Peng <pengdonglin@sangfor.com.cn> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2023-04-08 08:42:21 -04:00
PTR_L a0, sp, FGRET_REGS_A0
PTR_L a1, sp, FGRET_REGS_A1
PTR_ADDI sp, sp, FGRET_REGS_SIZE
LoongArch/ftrace: Add basic support This patch contains basic ftrace support for LoongArch. Specifically, function tracer (HAVE_FUNCTION_TRACER), function graph tracer (HAVE_ FUNCTION_GRAPH_TRACER) are implemented following the instructions in Documentation/trace/ftrace-design.txt. Use `-pg` makes stub like a child function `void _mcount(void *ra)`. Thus, it can be seen store RA and alloc stack before `call _mcount`. Find `alloc stack` at first, and then find `store RA`. Note that the functions in both inst.c and time.c should not be hooked with the compiler's -pg option: to prevent infinite self-referencing for the former, and to ignore early setup stuff for the latter. Co-developed-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-12-10 09:40:15 -05:00
jr ra
SYM_FUNC_END(return_to_handler)
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */