| /* |
| * Some macros to handle stack frames in assembly. |
| */ |
| |
| #include <linux/config.h> |
| |
| #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 |
| |
| .macro SAVE_ARGS addskip=0,norcx=0 |
| subq $9*8+\addskip,%rsp |
| movq %rdi,8*8(%rsp) |
| movq %rsi,7*8(%rsp) |
| movq %rdx,6*8(%rsp) |
| .if \norcx |
| .else |
| movq %rcx,5*8(%rsp) |
| .endif |
| movq %rax,4*8(%rsp) |
| movq %r8,3*8(%rsp) |
| movq %r9,2*8(%rsp) |
| movq %r10,1*8(%rsp) |
| movq %r11,(%rsp) |
| .endm |
| |
| #define ARG_SKIP 9*8 |
| .macro RESTORE_ARGS skiprax=0,addskip=0,skiprcx=0 |
| movq (%rsp),%r11 |
| movq 1*8(%rsp),%r10 |
| movq 2*8(%rsp),%r9 |
| movq 3*8(%rsp),%r8 |
| .if \skiprax |
| .else |
| movq 4*8(%rsp),%rax |
| .endif |
| .if \skiprcx |
| .else |
| movq 5*8(%rsp),%rcx |
| .endif |
| movq 6*8(%rsp),%rdx |
| movq 7*8(%rsp),%rsi |
| movq 8*8(%rsp),%rdi |
| .if ARG_SKIP+\addskip > 0 |
| addq $ARG_SKIP+\addskip,%rsp |
| .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 |
| |
| .macro SAVE_REST |
| subq $6*8,%rsp |
| movq %rbx,5*8(%rsp) |
| movq %rbp,4*8(%rsp) |
| movq %r12,3*8(%rsp) |
| movq %r13,2*8(%rsp) |
| movq %r14,1*8(%rsp) |
| movq %r15,(%rsp) |
| .endm |
| |
| #define REST_SKIP 6*8 |
| .macro RESTORE_REST |
| movq (%rsp),%r15 |
| movq 1*8(%rsp),%r14 |
| movq 2*8(%rsp),%r13 |
| movq 3*8(%rsp),%r12 |
| movq 4*8(%rsp),%rbp |
| movq 5*8(%rsp),%rbx |
| addq $REST_SKIP,%rsp |
| .endm |
| |
| .macro SAVE_ALL |
| SAVE_ARGS |
| SAVE_REST |
| .endm |
| |
| .macro RESTORE_ALL addskip=0 |
| RESTORE_REST |
| RESTORE_ARGS 0,\addskip |
| .endm |
| |
| /* push in order ss, rsp, eflags, cs, rip */ |
| .macro FAKE_STACK_FRAME child_rip |
| xorl %eax,%eax |
| subq $6*8,%rsp |
| movq %rax,5*8(%rsp) /* ss */ |
| movq %rax,4*8(%rsp) /* rsp */ |
| movq $(1<<9),3*8(%rsp) /* eflags - enable interrupts */ |
| movq $__KERNEL_CS,2*8(%rsp) /* cs */ |
| movq \child_rip,1*8(%rsp) /* rip */ |
| movq %rax,(%rsp) /* orig_rax */ |
| .endm |
| |
| .macro UNFAKE_STACK_FRAME |
| addq $8*6, %rsp |
| .endm |
| |
| .macro icebp |
| .byte 0xf1 |
| .endm |
| |
| #ifdef CONFIG_FRAME_POINTER |
| #define ENTER enter |
| #define LEAVE leave |
| #else |
| #define ENTER |
| #define LEAVE |
| #endif |
