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calling.h
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calling.h
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/*
* Some macros to handle stack frames in assembly.
*/
#define R15 0
#define R14 8
#define R13 16
#define R12 24
#define RBP 32
#define RBX 40
/* arguments: interrupts/non tracing syscalls only save upto here*/
#define R11 48
#define R10 56
#define R9 64
#define R8 72
#define RAX 80
#define RCX 88
#define RDX 96
#define RSI 104
#define RDI 112
#define ORIG_RAX 120 /* + error_code */
/* end of arguments */
/* cpu exception frame or undefined in case of fast syscall. */
#define RIP 128
#define CS 136
#define EFLAGS 144
#define RSP 152
#define SS 160
#define ARGOFFSET R11
#define SWFRAME ORIG_RAX
.macro SAVE_ARGS addskip=0,norcx=0,nor891011=0
subq $9*8+\addskip,%rsp
CFI_ADJUST_CFA_OFFSET 9*8+\addskip
movq %rdi,8*8(%rsp)
CFI_REL_OFFSET rdi,8*8
movq %rsi,7*8(%rsp)
CFI_REL_OFFSET rsi,7*8
movq %rdx,6*8(%rsp)
CFI_REL_OFFSET rdx,6*8
.if \norcx
.else
movq %rcx,5*8(%rsp)
CFI_REL_OFFSET rcx,5*8
.endif
movq %rax,4*8(%rsp)
CFI_REL_OFFSET rax,4*8
.if \nor891011
.else
movq %r8,3*8(%rsp)
CFI_REL_OFFSET r8,3*8
movq %r9,2*8(%rsp)
CFI_REL_OFFSET r9,2*8
movq %r10,1*8(%rsp)
CFI_REL_OFFSET r10,1*8
movq %r11,(%rsp)
CFI_REL_OFFSET r11,0*8
.endif
.endm
#define ARG_SKIP 9*8
.macro RESTORE_ARGS skiprax=0,addskip=0,skiprcx=0,skipr11=0,skipr8910=0,skiprdx=0
.if \skipr11
.else
movq (%rsp),%r11
CFI_RESTORE r11
.endif
.if \skipr8910
.else
movq 1*8(%rsp),%r10
CFI_RESTORE r10
movq 2*8(%rsp),%r9
CFI_RESTORE r9
movq 3*8(%rsp),%r8
CFI_RESTORE r8
.endif
.if \skiprax
.else
movq 4*8(%rsp),%rax
CFI_RESTORE rax
.endif
.if \skiprcx
.else
movq 5*8(%rsp),%rcx
CFI_RESTORE rcx
.endif
.if \skiprdx
.else
movq 6*8(%rsp),%rdx
CFI_RESTORE rdx
.endif
movq 7*8(%rsp),%rsi
CFI_RESTORE rsi
movq 8*8(%rsp),%rdi
CFI_RESTORE rdi
.if ARG_SKIP+\addskip > 0
addq $ARG_SKIP+\addskip,%rsp
CFI_ADJUST_CFA_OFFSET -(ARG_SKIP+\addskip)
.endif
.endm
.macro LOAD_ARGS offset
movq \offset(%rsp),%r11
movq \offset+8(%rsp),%r10
movq \offset+16(%rsp),%r9
movq \offset+24(%rsp),%r8
movq \offset+40(%rsp),%rcx
movq \offset+48(%rsp),%rdx
movq \offset+56(%rsp),%rsi
movq \offset+64(%rsp),%rdi
movq \offset+72(%rsp),%rax
.endm
#define REST_SKIP 6*8
.macro SAVE_REST
subq $REST_SKIP,%rsp
CFI_ADJUST_CFA_OFFSET REST_SKIP
movq %rbx,5*8(%rsp)
CFI_REL_OFFSET rbx,5*8
movq %rbp,4*8(%rsp)
CFI_REL_OFFSET rbp,4*8
movq %r12,3*8(%rsp)
CFI_REL_OFFSET r12,3*8
movq %r13,2*8(%rsp)
CFI_REL_OFFSET r13,2*8
movq %r14,1*8(%rsp)
CFI_REL_OFFSET r14,1*8
movq %r15,(%rsp)
CFI_REL_OFFSET r15,0*8
.endm
.macro RESTORE_REST
movq (%rsp),%r15
CFI_RESTORE r15
movq 1*8(%rsp),%r14
CFI_RESTORE r14
movq 2*8(%rsp),%r13
CFI_RESTORE r13
movq 3*8(%rsp),%r12
CFI_RESTORE r12
movq 4*8(%rsp),%rbp
CFI_RESTORE rbp
movq 5*8(%rsp),%rbx
CFI_RESTORE rbx
addq $REST_SKIP,%rsp
CFI_ADJUST_CFA_OFFSET -(REST_SKIP)
.endm
.macro SAVE_ALL
SAVE_ARGS
SAVE_REST
.endm
.macro RESTORE_ALL addskip=0
RESTORE_REST
RESTORE_ARGS 0,\addskip
.endm
.macro icebp
.byte 0xf1
.endm