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.global __syscall
__syscall:
mov %rdi, %rax
mov %rsi, %rdi
mov %rdx, %rsi
mov %rcx, %rdx
mov %r8, %r10
mov %r9, %r8
mov 8(%rsp), %r9
syscall
ret
.global __setjmp
__setjmp:
/* setjmp() in C sets env[0] to 0 */
mov %rbx, 0x08(%rdi)
mov %rcx, 0x10(%rdi)
mov %rdx, 0x18(%rdi)
mov %rsp, 0x20(%rdi)
mov %rbp, 0x28(%rdi)
mov %rsi, 0x30(%rdi)
mov %rdi, 0x38(%rdi)
mov %r8, 0x40(%rdi)
mov %r9, 0x48(%rdi)
mov %r10, 0x50(%rdi)
mov %r11, 0x58(%rdi)
mov %r12, 0x60(%rdi)
mov %r13, 0x68(%rdi)
mov %r14, 0x70(%rdi)
mov %r15, 0x78(%rdi)
mov 0x00(%rbp), %rax
mov %rax, 0x80(%rdi)
mov 0x08(%rbp), %rax
mov %rax, 0x88(%rdi)
mov 0x00(%rsp), %rax
mov %rax, 0x90(%rdi)
xor %rax, %rax
ret
.global __longjmp
__longjmp:
mov %rdi, %rax
mov 0x08(%rax), %rbx
mov 0x18(%rax), %rdx
mov 0x20(%rax), %rsp
mov 0x28(%rax), %rbp
mov 0x30(%rax), %rsi
mov 0x38(%rax), %rdi
mov 0x40(%rax), %r8
mov 0x48(%rax), %r9
mov 0x50(%rax), %r10
mov 0x58(%rax), %r11
mov 0x60(%rax), %r12
mov 0x68(%rax), %r13
mov 0x70(%rax), %r14
mov 0x78(%rax), %r15
mov 0x80(%rax), %rcx
mov %rcx, 0x00(%rbp)
mov 0x88(%rax), %rcx
mov %rcx, 0x08(%rbp)
mov 0x90(%rax), %rcx
mov %rcx, 0x00(%rsp)
mov 0x10(%rax), %rcx
mov 0x00(%rax), %rax
ret
/* FIXME: this seems to be unpossible to put in a shared library */
/* FIXME: it may be worthwhile to separate this into crt1.s */
.global _start
_start:
popq %rdi
movq %rsp, %rsi
call __libc_start
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