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98b8aebb14
The SYM_SIGFUNC_START definition should match sigcontext that the length
of GPRs are 8 bytes for both 32BIT and 64BIT. So replace SZREG with 8 to
fix it.
Cc: stable@vger.kernel.org
Fixes: e4878c37f6 ("LoongArch: vDSO: Emit GNU_EH_FRAME correctly")
Suggested-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_LINKAGE_H
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#define __ASM_LINKAGE_H
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#define __ALIGN .align 2
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#define __ALIGN_STR __stringify(__ALIGN)
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#define SYM_FUNC_START(name) \
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SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) \
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.cfi_startproc;
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#define SYM_FUNC_START_NOALIGN(name) \
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SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE) \
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.cfi_startproc;
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#define SYM_FUNC_START_LOCAL(name) \
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SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN) \
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.cfi_startproc;
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#define SYM_FUNC_START_LOCAL_NOALIGN(name) \
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SYM_START(name, SYM_L_LOCAL, SYM_A_NONE) \
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.cfi_startproc;
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#define SYM_FUNC_START_WEAK(name) \
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SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN) \
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.cfi_startproc;
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#define SYM_FUNC_START_WEAK_NOALIGN(name) \
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SYM_START(name, SYM_L_WEAK, SYM_A_NONE) \
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.cfi_startproc;
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#define SYM_FUNC_END(name) \
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.cfi_endproc; \
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SYM_END(name, SYM_T_FUNC)
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#define SYM_CODE_START(name) \
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SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) \
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.cfi_startproc;
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#define SYM_CODE_END(name) \
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.cfi_endproc; \
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SYM_END(name, SYM_T_NONE)
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/*
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* This is for the signal handler trampoline, which is used as the return
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* address of the signal handlers in userspace instead of called normally.
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* The long standing libgcc bug https://gcc.gnu.org/PR124050 requires a
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* nop between .cfi_startproc and the actual address of the trampoline, so
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* we cannot simply use SYM_FUNC_START.
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*
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* This wrapper also contains all the .cfi_* directives for recovering
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* the content of the GPRs and the "return address" (where the rt_sigreturn
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* syscall will jump to), assuming there is a struct rt_sigframe (where
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* a struct sigcontext containing those information we need to recover) at
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* $sp. The "DWARF for the LoongArch(TM) Architecture" manual states
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* column 0 is for $zero, but it does not make too much sense to
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* save/restore the hardware zero register. Repurpose this column here
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* for the return address (here it's not the content of $ra we cannot use
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* the default column 3).
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*/
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#define SYM_SIGFUNC_START(name) \
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.cfi_startproc; \
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.cfi_signal_frame; \
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.cfi_def_cfa 3, RT_SIGFRAME_SC; \
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.cfi_return_column 0; \
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.cfi_offset 0, SC_PC; \
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\
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.irp num, 1, 2, 3, 4, 5, 6, 7, 8, \
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9, 10, 11, 12, 13, 14, 15, 16, \
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17, 18, 19, 20, 21, 22, 23, 24, \
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25, 26, 27, 28, 29, 30, 31; \
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.cfi_offset \num, SC_REGS + \num * 8; \
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.endr; \
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\
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nop; \
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SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)
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#define SYM_SIGFUNC_END(name) SYM_FUNC_END(name)
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#endif
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