include/asm-x86_64/calling.h

   1 /*
   2  * Some macros to handle stack frames in assembly.
   3  */
   4
   5 #include <linux/config.h>
   6
   7 #define R15 0
   8 #define R14 8
   9 #define R13 16
  10 #define R12 24
  11 #define RBP 32
  12 #define RBX 40
  13 /* arguments: interrupts/non tracing syscalls only save upto here*/
  14 #define R11 48
  15 #define R10 56
  16 #define R9 64
  17 #define R8 72
  18 #define RAX 80
  19 #define RCX 88
  20 #define RDX 96
  21 #define RSI 104
  22 #define RDI 112
  23 #define ORIG_RAX 120       /* + error_code */
  24 /* end of arguments */
  25 /* cpu exception frame or undefined in case of fast syscall. */
  26 #define RIP 128
  27 #define CS 136
  28 #define EFLAGS 144
  29 #define RSP 152
  30 #define SS 160
  31 #define ARGOFFSET R11
  32 #define SWFRAME ORIG_RAX
  33
  34         .macro SAVE_ARGS addskip=0,norcx=0,nor891011=0
  35         subq  $9*8+\addskip,%rsp
  36         CFI_ADJUST_CFA_OFFSET   9*8+\addskip
  37         movq  %rdi,8*8(%rsp)
  38         CFI_REL_OFFSET  rdi,8*8
  39         movq  %rsi,7*8(%rsp)
  40         CFI_REL_OFFSET  rsi,7*8
  41         movq  %rdx,6*8(%rsp)
  42         CFI_REL_OFFSET  rdx,6*8
  43         .if \norcx
  44         .else
  45         movq  %rcx,5*8(%rsp)
  46         CFI_REL_OFFSET  rcx,5*8
  47         .endif
  48         movq  %rax,4*8(%rsp)
  49         CFI_REL_OFFSET  rax,4*8
  50         .if \nor891011
  51         .else
  52         movq  %r8,3*8(%rsp)
  53         CFI_REL_OFFSET  r8,3*8
  54         movq  %r9,2*8(%rsp)
  55         CFI_REL_OFFSET  r9,2*8
  56         movq  %r10,1*8(%rsp)
  57         CFI_REL_OFFSET  r10,1*8
  58         movq  %r11,(%rsp)
  59         CFI_REL_OFFSET  r11,0*8
  60         .endif
  61         .endm
  62
  63 #define ARG_SKIP 9*8
  64         .macro RESTORE_ARGS skiprax=0,addskip=0,skiprcx=0,skipr11=0,skipr8910=0,skiprdx=0
  65         .if \skipr11
  66         .else
  67         movq (%rsp),%r11
  68         .endif
  69         .if \skipr8910
  70         .else
  71         movq 1*8(%rsp),%r10
  72         movq 2*8(%rsp),%r9
  73         movq 3*8(%rsp),%r8
  74         .endif
  75         .if \skiprax
  76         .else
  77         movq 4*8(%rsp),%rax
  78         .endif
  79         .if \skiprcx
  80         .else
  81         movq 5*8(%rsp),%rcx
  82         .endif
  83         .if \skiprdx
  84         .else
  85         movq 6*8(%rsp),%rdx
  86         .endif
  87         movq 7*8(%rsp),%rsi
  88         movq 8*8(%rsp),%rdi
  89         .if ARG_SKIP+\addskip > 0
  90         addq $ARG_SKIP+\addskip,%rsp
  91         CFI_ADJUST_CFA_OFFSET   -(ARG_SKIP+\addskip)
  92         .endif
  93         .endm
  94
  95         .macro LOAD_ARGS offset
  96         movq \offset(%rsp),%r11
  97         movq \offset+8(%rsp),%r10
  98         movq \offset+16(%rsp),%r9
  99         movq \offset+24(%rsp),%r8
 100         movq \offset+40(%rsp),%rcx
 101         movq \offset+48(%rsp),%rdx
 102         movq \offset+56(%rsp),%rsi
 103         movq \offset+64(%rsp),%rdi
 104         movq \offset+72(%rsp),%rax
 105         .endm
 106
 107 #define REST_SKIP 6*8
 108         .macro SAVE_REST
 109         subq $REST_SKIP,%rsp
 110         CFI_ADJUST_CFA_OFFSET   REST_SKIP
 111         movq %rbx,5*8(%rsp)
 112         CFI_REL_OFFSET  rbx,5*8
 113         movq %rbp,4*8(%rsp)
 114         CFI_REL_OFFSET  rbp,4*8
 115         movq %r12,3*8(%rsp)
 116         CFI_REL_OFFSET  r12,3*8
 117         movq %r13,2*8(%rsp)
 118         CFI_REL_OFFSET  r13,2*8
 119         movq %r14,1*8(%rsp)
 120         CFI_REL_OFFSET  r14,1*8
 121         movq %r15,(%rsp)
 122         CFI_REL_OFFSET  r15,0*8
 123         .endm
 124
 125         .macro RESTORE_REST
 126         movq (%rsp),%r15
 127         movq 1*8(%rsp),%r14
 128         movq 2*8(%rsp),%r13
 129         movq 3*8(%rsp),%r12
 130         movq 4*8(%rsp),%rbp
 131         movq 5*8(%rsp),%rbx
 132         addq $REST_SKIP,%rsp
 133         CFI_ADJUST_CFA_OFFSET   -(REST_SKIP)
 134         .endm
 135
 136         .macro SAVE_ALL
 137         SAVE_ARGS
 138         SAVE_REST
 139         .endm
 140
 141         .macro RESTORE_ALL addskip=0
 142         RESTORE_REST
 143         RESTORE_ARGS 0,\addskip
 144         .endm
 145
 146         .macro icebp
 147         .byte 0xf1
 148         .endm
 149
 150 #ifdef CONFIG_FRAME_POINTER
 151 #define ENTER enter
 152 #define LEAVE leave
 153 #else
 154 #define ENTER
 155 #define LEAVE
 156 #endif