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/*
* 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 36
#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
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