LXR linux/arch/x86/include/asm/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
 171