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#include <sys.s>
#include <sys/regdef.h>
/*
Kernel syscall interface:
Input:
v0 syscall number
Output:
This macro is similar to SYSCALL in sys/syscall.h, but not completely.
There's room for optimization, if we assume this will continue to
be assembled as one file.
Compile with -DPIC for pic code.
*/
#ifdef PIC
#define PICOPT .option pic2
#else
#define PICOPT
#endif
#define YSYSCALL(x) \
PICOPT; \
.globl machdep_sys_##x; \
.ent machdep_sys_##x, 0; \
machdep_sys_##x:; \
.frame sp,0,ra; \
.set noreorder; \
li v0, SYS_##x; \
syscall; \
bne a3, zero, 1b; \
nop; \
j ra; \
nop; \
.end machdep_sys_##x
/* ==========================================================================
* error code for all syscalls. The error value is returned as the negative
* of the errno value.
*/
1:
subu v0,zero,v0;
j ra;
/* ==========================================================================
* lstat
*/
PICOPT;
.globl machdep_sys_lstat;
.ent machdep_sys_lstat, 0;
machdep_sys_lstat:;
.frame sp,0,ra;
.set noreorder;
move a2, a1
move a1, a0
li a0, 2
li v0, SYS_lxstat;
syscall;
bne a3, zero, 1b;
nop;
j ra;
nop;
.end machdep_sys_lstat
/* ==========================================================================
* fstat
*/
PICOPT;
.globl machdep_sys_fstat;
.ent machdep_sys_fstat, 0;
machdep_sys_fstat:;
.frame sp,0,ra;
.set noreorder;
move a2, a1
move a1, a0
li a0, 2
li v0, SYS_fxstat;
syscall;
bne a3, zero, 1b;
nop;
j ra;
nop;
.end machdep_sys_fstat
/* ==========================================================================
* stat
*/
PICOPT;
.globl machdep_sys_stat;
.ent machdep_sys_stat, 0;
machdep_sys_stat:;
.frame sp,0,ra;
.set noreorder;
move a2, a1
move a1, a0
li a0, 2
li v0, SYS_xstat;
syscall;
bne a3, zero, 1b;
nop;
j ra;
nop;
.end machdep_sys_stat
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