diff options
| author | Aleksa Vuckovic <aleksa@vuckovic.cc> | 2023-02-25 05:43:37 +0100 |
|---|---|---|
| committer | Aleksa Vuckovic <aleksa@vuckovic.cc> | 2023-02-25 05:47:59 +0100 |
| commit | aaa23fffd02fb49cdbc56a480dbb5a8fa95bff38 (patch) | |
| tree | cefd59478bb62a2edca523adc9f10cec605f57b0 /kernel/include | |
| parent | 4931f266a72dccfb439badfa1070563003c80ce3 (diff) | |
x86_64_regs.S: (push/pop)_(callee/caller)_regs
Diffstat (limited to 'kernel/include')
| -rw-r--r-- | kernel/include/x86_64_regs.S | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/kernel/include/x86_64_regs.S b/kernel/include/x86_64_regs.S new file mode 100644 index 0000000..7b72d76 --- /dev/null +++ b/kernel/include/x86_64_regs.S @@ -0,0 +1,78 @@ +/* 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 |