Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 |