include/asm-x86/calling.h

   1 /*
   2  * Some macros to handle stack frames in assembly.
   3  */
   4
   5 #define R15               0
   6 #define R14               8
   7 #define R13              16
   8 #define R12              24
   9 #define RBP              32
  10 #define RBX              40
  11
  12 /* arguments: interrupts/non tracing syscalls only save upto here*/
  13 #define R11              48
  14 #define R10              56
  15 #define R9               64
  16 #define R8               72
  17 #define RAX              80
  18 #define RCX              88
  19 #define RDX              96
  20 #define RSI             104
  21 #define RDI             112
  22 #define ORIG_RAX        120       /* + error_code */
  23 /* end of arguments */
  24
  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
  32 #define ARGOFFSET       R11
  33 #define SWFRAME         ORIG_RAX
  34
  35         .macro SAVE_ARGS addskip=0, norcx=0, nor891011=0
  36         subq  $9*8+\addskip, %rsp
  37         CFI_ADJUST_CFA_OFFSET   9*8+\addskip
  38         movq  %rdi, 8*8(%rsp)
  39         CFI_REL_OFFSET  rdi, 8*8
  40         movq  %rsi, 7*8(%rsp)
  41         CFI_REL_OFFSET  rsi, 7*8
  42         movq  %rdx, 6*8(%rsp)
  43         CFI_REL_OFFSET  rdx, 6*8
  44         .if \norcx
  45         .else
  46         movq  %rcx, 5*8(%rsp)
  47         CFI_REL_OFFSET  rcx, 5*8
  48         .endif
  49         movq  %rax, 4*8(%rsp)
  50         CFI_REL_OFFSET  rax, 4*8
  51         .if \nor891011
  52         .else
  53         movq  %r8, 3*8(%rsp)
  54         CFI_REL_OFFSET  r8,  3*8
  55         movq  %r9, 2*8(%rsp)
  56         CFI_REL_OFFSET  r9,  2*8
  57         movq  %r10, 1*8(%rsp)
  58         CFI_REL_OFFSET  r10, 1*8
  59         movq  %r11, (%rsp)
  60         CFI_REL_OFFSET  r11, 0*8
  61         .endif
  62         .endm
  63
  64 #define ARG_SKIP        9*8
  65
  66         .macro RESTORE_ARGS skiprax=0, addskip=0, skiprcx=0, skipr11=0, \
  67                             skipr8910=0, skiprdx=0
  68         .if \skipr11
  69         .else
  70         movq (%rsp), %r11
  71         CFI_RESTORE r11
  72         .endif
  73         .if \skipr8910
  74         .else
  75         movq 1*8(%rsp), %r10
  76         CFI_RESTORE r10
  77         movq 2*8(%rsp), %r9
  78         CFI_RESTORE r9
  79         movq 3*8(%rsp), %r8
  80         CFI_RESTORE r8
  81         .endif
  82         .if \skiprax
  83         .else
  84         movq 4*8(%rsp), %rax
  85         CFI_RESTORE rax
  86         .endif
  87         .if \skiprcx
  88         .else
  89         movq 5*8(%rsp), %rcx
  90         CFI_RESTORE rcx
  91         .endif
  92         .if \skiprdx
  93         .else
  94         movq 6*8(%rsp), %rdx
  95         CFI_RESTORE rdx
  96         .endif
  97         movq 7*8(%rsp), %rsi
  98         CFI_RESTORE rsi
  99         movq 8*8(%rsp), %rdi
 100         CFI_RESTORE rdi
 101         .if ARG_SKIP+\addskip > 0
 102         addq $ARG_SKIP+\addskip, %rsp
 103         CFI_ADJUST_CFA_OFFSET   -(ARG_SKIP+\addskip)
 104         .endif
 105         .endm
 106
 107         .macro LOAD_ARGS offset, skiprax=0
 108         movq \offset(%rsp),    %r11
 109         movq \offset+8(%rsp),  %r10
 110         movq \offset+16(%rsp), %r9
 111         movq \offset+24(%rsp), %r8
 112         movq \offset+40(%rsp), %rcx
 113         movq \offset+48(%rsp), %rdx
 114         movq \offset+56(%rsp), %rsi
 115         movq \offset+64(%rsp), %rdi
 116         .if \skiprax
 117         .else
 118         movq \offset+72(%rsp), %rax
 119         .endif
 120         .endm
 121
 122 #define REST_SKIP       6*8
 123
 124         .macro SAVE_REST
 125         subq $REST_SKIP, %rsp
 126         CFI_ADJUST_CFA_OFFSET   REST_SKIP
 127         movq %rbx, 5*8(%rsp)
 128         CFI_REL_OFFSET  rbx, 5*8
 129         movq %rbp, 4*8(%rsp)
 130         CFI_REL_OFFSET  rbp, 4*8
 131         movq %r12, 3*8(%rsp)
 132         CFI_REL_OFFSET  r12, 3*8
 133         movq %r13, 2*8(%rsp)
 134         CFI_REL_OFFSET  r13, 2*8
 135         movq %r14, 1*8(%rsp)
 136         CFI_REL_OFFSET  r14, 1*8
 137         movq %r15, (%rsp)
 138         CFI_REL_OFFSET  r15, 0*8
 139         .endm
 140
 141         .macro RESTORE_REST
 142         movq (%rsp),     %r15
 143         CFI_RESTORE r15
 144         movq 1*8(%rsp),  %r14
 145         CFI_RESTORE r14
 146         movq 2*8(%rsp),  %r13
 147         CFI_RESTORE r13
 148         movq 3*8(%rsp),  %r12
 149         CFI_RESTORE r12
 150         movq 4*8(%rsp),  %rbp
 151         CFI_RESTORE rbp
 152         movq 5*8(%rsp),  %rbx
 153         CFI_RESTORE rbx
 154         addq $REST_SKIP, %rsp
 155         CFI_ADJUST_CFA_OFFSET   -(REST_SKIP)
 156         .endm
 157
 158         .macro SAVE_ALL
 159         SAVE_ARGS
 160         SAVE_REST
 161         .endm
 162
 163         .macro RESTORE_ALL addskip=0
 164         RESTORE_REST
 165         RESTORE_ARGS 0, \addskip
 166         .endm
 167
 168         .macro icebp
 169         .byte 0xf1
 170         .endm