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884961618e
The vdso32 sigreturn.S contains open-coded DWARF bytecode, which includes a hack for gdb to not try to step back to a previous call instruction when backtracing from a signal handler. Neither of those are necessary anymore: the backtracing issue is handled by ".cfi_entry simple" and ".cfi_signal_frame", both of which have been supported for a very long time now, which allows the remaining frame to be built using regular .cfi annotations. Add a few more register offsets to the signal frame just for good measure. Replace the nop on fallthrough of the system call (which should never, ever happen) with a ud2a trap. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://patch.msgid.link/20251216212606.1325678-7-hpa@zytor.com
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_DWARF2_H
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#define _ASM_X86_DWARF2_H
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#ifndef __ASSEMBLER__
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#warning "asm/dwarf2.h should be only included in pure assembly files"
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#endif
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#define CFI_STARTPROC .cfi_startproc
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#define CFI_ENDPROC .cfi_endproc
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#define CFI_DEF_CFA .cfi_def_cfa
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#define CFI_DEF_CFA_REGISTER .cfi_def_cfa_register
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#define CFI_DEF_CFA_OFFSET .cfi_def_cfa_offset
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#define CFI_ADJUST_CFA_OFFSET .cfi_adjust_cfa_offset
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#define CFI_OFFSET .cfi_offset
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#define CFI_REL_OFFSET .cfi_rel_offset
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#define CFI_REGISTER .cfi_register
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#define CFI_RESTORE .cfi_restore
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#define CFI_REMEMBER_STATE .cfi_remember_state
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#define CFI_RESTORE_STATE .cfi_restore_state
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#define CFI_UNDEFINED .cfi_undefined
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#define CFI_ESCAPE .cfi_escape
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#define CFI_SIGNAL_FRAME .cfi_signal_frame
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#ifndef BUILD_VDSO
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/*
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* Emit CFI data in .debug_frame sections, not .eh_frame sections.
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* The latter we currently just discard since we don't do DWARF
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* unwinding at runtime. So only the offline DWARF information is
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* useful to anyone. Note we should not use this directive if we
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* ever decide to enable DWARF unwinding at runtime.
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*/
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.cfi_sections .debug_frame
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#else
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/*
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* For the vDSO, emit both runtime unwind information and debug
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* symbols for the .dbg file.
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*/
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.cfi_sections .eh_frame, .debug_frame
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#endif
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#endif /* _ASM_X86_DWARF2_H */
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