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.section ".data"
.globl linux_errno
linux_errno: .int 0
.section ".text"
.code64
.globl linux_syscall
.type linux_syscall, @function
linux_syscall:
movq %rdi, %rax // C arg1 -> syscall number
movq %rsi, %rdi // C arg2 -> syscall arg1
movq %rdx, %rsi // C arg3 -> syscall arg2
movq %rcx, %rdx // C arg4 -> syscall arg3
movq %r8, %r10 // C arg5 -> syscall arg4
movq %r9, %r8 // C arg6 -> syscall arg5
movq 8(%rsp), %r9 // C arg7 -> syscall arg6
syscall
cmpq $-4095, %rax
jae 1f
ret
1:
negq %rax
movl %eax, linux_errno
movq $-1, %rax
ret
.size linux_syscall, . - linux_syscall
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