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/* SPDX-License-Identifier: GPL-2.0-only */
.text
.code64
.section ".text.protected_mode_call", "ax", @progbits
.globl protected_mode_call_narg
protected_mode_call_narg:
push %rbp
mov %rsp, %rbp
/* Preserve registers */
push %rbx
push %r12
push %r13
push %r14
push %r15
/* Backup gs to stack */
movl %gs, %eax
push %rax
/* Arguments to stack */
push %rdi
push %rsi
push %rdx
push %rcx
#include <cpu/x86/64bit/exit32.inc>
movl -56(%ebp), %eax /* Argument count */
movl -72(%ebp), %edx /* Argument 0 */
movl -80(%ebp), %ecx /* Argument 1 */
/* Align the stack */
andl $0xFFFFFFF0, %esp
test %eax, %eax
je 1f /* Zero arguments */
subl $1, %eax
test %eax, %eax
je 2f /* One argument */
/* Two arguments */
subl $8, %esp
pushl %ecx /* Argument 1 */
pushl %edx /* Argument 0 */
jmp 1f
2:
subl $12, %esp
pushl %edx /* Argument 0 */
1:
movl -64(%ebp), %ebx /* Function to call */
call *%ebx
movl %eax, %ebx
/* Preserves ebx */
#include <cpu/x86/64bit/entry64.inc>
/* Place return value in rax */
movl %ebx, %eax
/* Restore registers */
mov -48(%rbp), %rbx
movl %ebx, %gs
mov -40(%rbp), %r15
mov -32(%rbp), %r14
mov -24(%rbp), %r13
mov -16(%rbp), %r12
mov -8(%rbp), %rbx
/* Restore stack pointer */
mov %rbp, %rsp
pop %rbp
ret
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