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

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2.2 KiB
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*
* Derived from MIPS:
* Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
* Copyright (C) 2002, 2007 Maciej W. Rozycki
* Copyright (C) 2001, 2012 MIPS Technologies, Inc. All rights reserved.
*/
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/loongarch.h>
#include <asm/regdef.h>
#include <asm/fpregdef.h>
#include <asm/stackframe.h>
#include <asm/thread_info.h>
.align 5
SYM_FUNC_START(__arch_cpu_idle)
/* start of rollback region */
LONG_L t0, tp, TI_FLAGS
nop
andi t0, t0, _TIF_NEED_RESCHED
bnez t0, 1f
nop
nop
nop
idle 0
/* end of rollback region */
1: jr ra
SYM_FUNC_END(__arch_cpu_idle)
SYM_CODE_START(handle_vint)
UNWIND_HINT_UNDEFINED
BACKUP_T0T1
SAVE_ALL
la_abs t1, __arch_cpu_idle
LONG_L t0, sp, PT_ERA
/* 32 byte rollback region */
ori t0, t0, 0x1f
xori t0, t0, 0x1f
bne t0, t1, 1f
LONG_S t0, sp, PT_ERA
1: move a0, sp
move a1, sp
la_abs t0, do_vint
jirl ra, t0, 0
RESTORE_ALL_AND_RET
SYM_CODE_END(handle_vint)
SYM_CODE_START(except_vec_cex)
UNWIND_HINT_UNDEFINED
b cache_parity_error
SYM_CODE_END(except_vec_cex)
.macro build_prep_badv
csrrd t0, LOONGARCH_CSR_BADV
PTR_S t0, sp, PT_BVADDR
.endm
.macro build_prep_fcsr
movfcsr2gr a1, fcsr0
.endm
.macro build_prep_none
.endm
.macro BUILD_HANDLER exception handler prep
.align 5
SYM_CODE_START(handle_\exception)
UNWIND_HINT_UNDEFINED
666:
BACKUP_T0T1
SAVE_ALL
build_prep_\prep
move a0, sp
la_abs t0, do_\handler
jirl ra, t0, 0
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
BUILD_HANDLER ale ale badv
LoongArch: Relay BCE exceptions to userland as SIGSEGV with si_code=SEGV_BNDERR SEGV_BNDERR was introduced initially for supporting the Intel MPX, but fell into disuse after the MPX support was removed. The LoongArch bounds-checking instructions behave very differently than MPX, but overall the interface is still kind of suitable for conveying the information to userland when bounds-checking assertions trigger, so we wouldn't have to invent more UAPI. Specifically, when the BCE triggers, a SEGV_BNDERR is sent to userland, with si_addr set to the out-of-bounds address or value (in asrt{gt,le}'s case), and one of si_lower or si_upper set to the configured bound depending on the faulting instruction. The other bound is set to either 0 or ULONG_MAX to resemble a range with both lower and upper bounds. Note that it is possible to have si_addr == si_lower in case of a failing asrtgt or {ld,st}gt, because those instructions test for strict greater-than relationship. This should not pose a problem for userland, though, because the faulting PC is available for the application to associate back to the exact instruction for figuring out the expectation. Example exception context generated by a faulting `asrtgt.d t0, t1` (assert t0 > t1 or BCE) with t0=100 and t1=200: > pc 00005555558206a4 ra 00007ffff2d854fc tp 00007ffff2f2f180 sp 00007ffffbf9fb80 > a0 0000000000000002 a1 00007ffffbf9fce8 a2 00007ffffbf9fd00 a3 00007ffff2ed4558 > a4 0000000000000000 a5 00007ffff2f044c8 a6 00007ffffbf9fce0 a7 fffffffffffff000 > t0 0000000000000064 t1 00000000000000c8 t2 00007ffffbfa2d5e t3 00007ffff2f12aa0 > t4 00007ffff2ed6158 t5 00007ffff2ed6158 t6 000000000000002e t7 0000000003d8f538 > t8 0000000000000005 u0 0000000000000000 s9 0000000000000000 s0 00007ffffbf9fce8 > s1 0000000000000002 s2 0000000000000000 s3 00007ffff2f2c038 s4 0000555555820610 > s5 00007ffff2ed5000 s6 0000555555827e38 s7 00007ffffbf9fd00 s8 0000555555827e38 > ra: 00007ffff2d854fc > ERA: 00005555558206a4 > CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE) > PRMD: 00000007 (PPLV3 +PIE -PWE) > EUEN: 00000000 (-FPE -SXE -ASXE -BTE) > ECFG: 0007181c (LIE=2-4,11-12 VS=7) > ESTAT: 000a0000 [BCE] (IS= ECode=10 EsubCode=0) > PRID: 0014c010 (Loongson-64bit, Loongson-3A5000) Signed-off-by: WANG Xuerui <git@xen0n.name> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2023-05-01 05:19:27 -04:00
BUILD_HANDLER bce bce none
BUILD_HANDLER bp bp none
BUILD_HANDLER fpe fpe fcsr
BUILD_HANDLER fpu fpu none
BUILD_HANDLER lsx lsx none
BUILD_HANDLER lasx lasx none
BUILD_HANDLER lbt lbt none
BUILD_HANDLER ri ri none
BUILD_HANDLER watch watch none
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)