7effaa882a
Being the foundation for reliable stack unwinding, this fixes CFI unwind annotations in many low-level x86_64 routines, plus a config option (available to all architectures, and also present in the previously sent patch adding such annotations to i386 code) to enable them separatly rather than only along with adding full debug information. Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
164 lines
3 KiB
C
164 lines
3 KiB
C
/*
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* Some macros to handle stack frames in assembly.
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*/
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#include <linux/config.h>
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#define R15 0
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#define R14 8
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#define R13 16
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#define R12 24
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#define RBP 32
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#define RBX 40
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/* arguments: interrupts/non tracing syscalls only save upto here*/
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#define R11 48
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#define R10 56
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#define R9 64
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#define R8 72
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#define RAX 80
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#define RCX 88
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#define RDX 96
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#define RSI 104
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#define RDI 112
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#define ORIG_RAX 120 /* + error_code */
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/* end of arguments */
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/* cpu exception frame or undefined in case of fast syscall. */
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#define RIP 128
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#define CS 136
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#define EFLAGS 144
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#define RSP 152
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#define SS 160
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#define ARGOFFSET R11
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#define SWFRAME ORIG_RAX
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.macro SAVE_ARGS addskip=0,norcx=0,nor891011=0
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subq $9*8+\addskip,%rsp
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CFI_ADJUST_CFA_OFFSET 9*8+\addskip
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movq %rdi,8*8(%rsp)
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CFI_REL_OFFSET rdi,8*8
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movq %rsi,7*8(%rsp)
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CFI_REL_OFFSET rsi,7*8
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movq %rdx,6*8(%rsp)
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CFI_REL_OFFSET rdx,6*8
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.if \norcx
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.else
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movq %rcx,5*8(%rsp)
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CFI_REL_OFFSET rcx,5*8
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.endif
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movq %rax,4*8(%rsp)
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CFI_REL_OFFSET rax,4*8
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.if \nor891011
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.else
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movq %r8,3*8(%rsp)
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CFI_REL_OFFSET r8,3*8
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movq %r9,2*8(%rsp)
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CFI_REL_OFFSET r9,2*8
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movq %r10,1*8(%rsp)
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CFI_REL_OFFSET r10,1*8
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movq %r11,(%rsp)
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CFI_REL_OFFSET r11,0*8
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.endif
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.endm
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#define ARG_SKIP 9*8
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.macro RESTORE_ARGS skiprax=0,addskip=0,skiprcx=0,skipr11=0,skipr8910=0,skiprdx=0
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.if \skipr11
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.else
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movq (%rsp),%r11
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CFI_RESTORE r11
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.endif
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.if \skipr8910
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.else
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movq 1*8(%rsp),%r10
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CFI_RESTORE r10
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movq 2*8(%rsp),%r9
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CFI_RESTORE r9
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movq 3*8(%rsp),%r8
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CFI_RESTORE r8
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.endif
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.if \skiprax
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.else
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movq 4*8(%rsp),%rax
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CFI_RESTORE rax
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.endif
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.if \skiprcx
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.else
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movq 5*8(%rsp),%rcx
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CFI_RESTORE rcx
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.endif
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.if \skiprdx
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.else
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movq 6*8(%rsp),%rdx
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CFI_RESTORE rdx
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.endif
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movq 7*8(%rsp),%rsi
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CFI_RESTORE rsi
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movq 8*8(%rsp),%rdi
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CFI_RESTORE rdi
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.if ARG_SKIP+\addskip > 0
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addq $ARG_SKIP+\addskip,%rsp
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CFI_ADJUST_CFA_OFFSET -(ARG_SKIP+\addskip)
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.endif
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.endm
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.macro LOAD_ARGS offset
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movq \offset(%rsp),%r11
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movq \offset+8(%rsp),%r10
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movq \offset+16(%rsp),%r9
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movq \offset+24(%rsp),%r8
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movq \offset+40(%rsp),%rcx
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movq \offset+48(%rsp),%rdx
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movq \offset+56(%rsp),%rsi
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movq \offset+64(%rsp),%rdi
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movq \offset+72(%rsp),%rax
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.endm
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#define REST_SKIP 6*8
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.macro SAVE_REST
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subq $REST_SKIP,%rsp
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CFI_ADJUST_CFA_OFFSET REST_SKIP
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movq %rbx,5*8(%rsp)
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CFI_REL_OFFSET rbx,5*8
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movq %rbp,4*8(%rsp)
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CFI_REL_OFFSET rbp,4*8
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movq %r12,3*8(%rsp)
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CFI_REL_OFFSET r12,3*8
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movq %r13,2*8(%rsp)
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CFI_REL_OFFSET r13,2*8
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movq %r14,1*8(%rsp)
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CFI_REL_OFFSET r14,1*8
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movq %r15,(%rsp)
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CFI_REL_OFFSET r15,0*8
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.endm
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.macro RESTORE_REST
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movq (%rsp),%r15
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CFI_RESTORE r15
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movq 1*8(%rsp),%r14
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CFI_RESTORE r14
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movq 2*8(%rsp),%r13
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CFI_RESTORE r13
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movq 3*8(%rsp),%r12
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CFI_RESTORE r12
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movq 4*8(%rsp),%rbp
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CFI_RESTORE rbp
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movq 5*8(%rsp),%rbx
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CFI_RESTORE rbx
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addq $REST_SKIP,%rsp
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CFI_ADJUST_CFA_OFFSET -(REST_SKIP)
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.endm
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.macro SAVE_ALL
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SAVE_ARGS
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SAVE_REST
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.endm
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.macro RESTORE_ALL addskip=0
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RESTORE_REST
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RESTORE_ARGS 0,\addskip
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.endm
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.macro icebp
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.byte 0xf1
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.endm
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