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512 lines (354 loc) · 5.02 KB
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Copy pathwrapper.S
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512 lines (354 loc) · 5.02 KB
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#include<asm.h>
ENTRY(write)
pushl %ebp
movl %esp, %ebp
// Save edx and ecx
pushl %edx
pushl %ecx
pushl %ebx
pushl %esi
movl 8(%ebp), %ebx
movl 12(%ebp), %ecx
movl 16(%ebp), %edx
movl $4, %eax
// Save return address
leal write_ret, %esi
pushl %esi
// Prepare stack frame for the syscall
pushl %ebp
movl %esp, %ebp
sysenter
write_ret:
movl %ebp, %esp
popl %ebp
test %eax, %eax
jns end_write
neg %eax
movl %eax, errno
movl $-1, %eax
end_write:
popl %esi
popl %esi
popl %ebx
popl %ecx
popl %edx
movl %ebp, %esp
popl %ebp
ret
ENTRY(gettime)
pushl %ebp
movl %esp, %ebp
movl $10, %eax
pushl %edx
pushl %ecx
pushl %esi
leal gettime_ret, %esi
pushl %esi
pushl %ebp
movl %esp, %ebp
sysenter
gettime_ret:
movl %ebp, %esp
popl %ebp
popl %esi
// error check
popl %esi
popl %ecx
popl %edx
movl %ebp, %esp
popl %ebp
ret
ENTRY(read)
pushl %ebp
movl %esp, %ebp
// Save edx and ecx
pushl %edx
pushl %ecx
pushl %ebx
pushl %esi
movl 8(%ebp), %ebx
movl 12(%ebp), %ecx
movl 16(%ebp), %edx
movl $3, %eax
// Save return address
leal read_ret, %esi
pushl %esi
// Prepare stack frame for the syscall
pushl %ebp
movl %esp, %ebp
sysenter
read_ret:
movl %ebp, %esp
popl %ebp
test %eax, %eax
jns end_read
neg %eax
movl %eax, errno
movl $-1, %eax
end_read:
popl %esi
popl %esi
popl %ebx
popl %ecx
popl %edx
movl %ebp, %esp
popl %ebp
ret
ENTRY(getpid)
pushl %ebp
movl %esp, %ebp
pushl %ecx
pushl %edx
pushl %esi
movl $20, %eax
leal getpid_ret, %esi
pushl %esi
pushl %ebp
movl %esp, %ebp
sysenter
getpid_ret:
movl %ebp, %esp
popl %ebp
popl %esi
// error check
popl %esi
popl %edx
popl %ecx
movl %ebp, %esp
popl %ebp
ret
ENTRY(fork)
pushl %ebp
movl %esp, %ebp
pushl %ecx
pushl %edx
pushl %esi
movl $2, %eax
leal fork_ret, %esi
pushl %esi
pushl %ebp
movl %esp, %ebp
sysenter
fork_ret:
movl %ebp, %esp
popl %ebp
popl %esi
test %eax, %eax
jns fork_end
neg %eax
movl %eax, errno
movl $-1, %eax
fork_end:
popl %esi
popl %edx
popl %ecx
movl %ebp, %esp
popl %ebp
ret
ENTRY(exit)
pushl %ebp
movl %esp, %ebp
movl $1, %eax
pushl %edx
pushl %ecx
pushl %esi
leal exit_ret, %esi
pushl %esi
pushl %ebp
movl %esp, %ebp
sysenter
exit_ret:
movl %ebp, %esp
popl %ebp
popl %esi
// error check
popl %esi
popl %ecx
popl %edx
movl %ebp, %esp
popl %ebp
ret
ENTRY(get_stats)
pushl %ebp
movl %esp, %ebp
movl $35, %eax
pushl %ebx
pushl %edx
pushl %ecx
pushl %esi
movl 8(%ebp), %ebx
movl 12(%ebp), %ecx
leal getstats_ret, %esi
pushl %esi
pushl %ebp
movl %esp, %ebp
sysenter
getstats_ret:
movl %ebp, %esp
popl %ebp
popl %esi
// error check
popl %esi
popl %ecx
popl %edx
popl %ebx
movl %ebp, %esp
popl %ebp
ret
ENTRY(clone)
pushl %ebp
movl %esp, %ebp
movl $19, %eax
pushl %ebx
pushl %edx
pushl %ecx
pushl %esi
movl 8(%ebp), %ebx
movl 12(%ebp), %ecx
leal clone_ret, %esi
pushl %esi
pushl %ebp
movl %esp, %ebp
sysenter
clone_ret:
movl %ebp, %esp
popl %ebp
test %eax, %eax
jns end_clone
neg %eax
movl %eax, errno
movl $-1, %eax
end_clone:
popl %esi
popl %esi
popl %ecx
popl %edx
popl %ebx
movl %ebp, %esp
popl %ebp
ret
ENTRY(sem_init)
pushl %ebp
movl %esp, %ebp
movl $21, %eax
pushl %ebx
pushl %edx
pushl %ecx
pushl %esi
movl 8(%ebp), %ebx
movl 12(%ebp), %ecx
leal sem_init_ret, %esi
pushl %esi
pushl %ebp
movl %esp, %ebp
sysenter
sem_init_ret:
movl %ebp, %esp
popl %ebp
test %eax, %eax
jns end_sem_init
neg %eax
movl %eax, errno
movl $-1, %eax
end_sem_init:
popl %esi
popl %esi
popl %ecx
popl %edx
popl %ebx
movl %ebp, %esp
popl %ebp
ret
ENTRY(sem_wait)
pushl %ebp
movl %esp, %ebp
movl $22, %eax
pushl %ebx
pushl %edx
pushl %ecx
pushl %esi
movl 8(%ebp), %ebx
leal sem_wait_ret, %esi
pushl %esi
pushl %ebp
movl %esp, %ebp
sysenter
sem_wait_ret:
movl %ebp, %esp
popl %ebp
test %eax, %eax
jns end_sem_wait
neg %eax
movl %eax, errno
movl $-1, %eax
end_sem_wait:
popl %esi
popl %esi
popl %ecx
popl %edx
popl %ebx
movl %ebp, %esp
popl %ebp
ret
ENTRY(sem_signal)
pushl %ebp
movl %esp, %ebp
movl $23, %eax
pushl %ebx
pushl %edx
pushl %ecx
pushl %esi
movl 8(%ebp), %ebx
leal sem_signal_ret, %esi
pushl %esi
pushl %ebp
movl %esp, %ebp
sysenter
sem_signal_ret:
movl %ebp, %esp
popl %ebp
test %eax, %eax
jns end_sem_signal
neg %eax
movl %eax, errno
movl $-1, %eax
end_sem_signal:
popl %esi
popl %esi
popl %ecx
popl %edx
popl %ebx
movl %ebp, %esp
popl %ebp
ret
ENTRY(sem_destroy)
pushl %ebp
movl %esp, %ebp
movl $24, %eax
pushl %ebx
pushl %edx
pushl %ecx
pushl %esi
movl 8(%ebp), %ebx
leal sem_destroy_ret, %esi
pushl %esi
pushl %ebp
movl %esp, %ebp
sysenter
sem_destroy_ret:
movl %ebp, %esp
popl %ebp
test %eax, %eax
jns end_sem_destroy
neg %eax
movl %eax, errno
movl $-1, %eax
end_sem_destroy:
popl %esi
popl %esi
popl %ecx
popl %edx
popl %ebx
movl %ebp, %esp
popl %ebp
ret