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/* isr stack */
/* ss:rsp (original rsp) -> rflags -> cs -> rip */
/* callee saved registers: rbx, rbp, rsp, r12, r13, r14, r15 */
/* isr saved registers: rsp, rip, rflags, cs, ss */
/* if the code will stay on same thread of execution use push/pop_caller_saved
* else use push/pop_callee_saved with push/pop_caller_saved
*/
/* push 0x30 bytes to stack */
.macro push_callee_saved
push %rbx
push %rbp
push %r12
push %r13
push %r14
push %r15
.endm
/* pop 0x30 bytes from stack */
.macro pop_callee_saved
push %rbx
push %rbp
push %r12
push %r13
push %r14
push %r15
.endm
/* push 0x50 bytes to stack */
.macro push_caller_saved
push %rax
push %rcx
push %rdx
push %rsi
push %rdi
push %r8
push %r9
push %r10
push %r11
mov %ds, %ax
shl $16, %rax
mov %es, %ax
shl $16, %rax
mov %fs, %ax
shl $16, %rax
mov %gs, %ax
push %rax
mov $0x10, %ax
mov %ax, %ds
mov %ax, %ss
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
mov 0x48(%rsp), %rax
.endm
/* pop 0x50 bytes from stack */
.macro pop_caller_saved
pop %rax
mov %ax, %gs
shr $16, %rax
mov %ax, %fs
shr $16, %rax
mov %ax, %es
shr $16, %rax
mov %ax, %ds
pop %r11
pop %r10
pop %r9
pop %r8
pop %rdi
pop %rsi
pop %rdx
pop %rcx
pop %rax
.endm
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