mirror of
https://github.com/MariaDB/server.git
synced 2025-01-25 00:04:33 +01:00
98 lines
2 KiB
ArmAsm
98 lines
2 KiB
ArmAsm
#include <asm.h>
|
|||
#include <regdef.h>
|
|||
#define COMPAT_43
|
|||
#include <syscall.h>
|
|||
|
|||
#undef SYSCALL
|
|||
|
|||
/* Kernel syscall interface:
|
|||
Input:
|
|||
v0 - system call number
|
|||
a* - arguments, as in C
|
|||
Output:
|
|||
a3 - zero iff successful
|
|||
v0 - errno value on failure, else result
|
|||
|
|||
This macro is similar to SYSCALL in asm.h, but not completely.
|
|||
There's room for optimization, if we assume this will continue to
|
|||
be assembled as one file.
|
|||
|
|||
This macro expansions does not include the return instruction.
|
|||
If there's no other work to be done, use something like:
|
|||
SYSCALL(foo) ; ret
|
|||
If there is other work to do (in fork, maybe?), do it after the
|
|||
SYSCALL invocation. */
|
|||
|
|||
#define SYSCALL(x) \
|
|||
.align 4 ;\
|
|||
.globl machdep_sys_##x ;\
|
|||
.ent machdep_sys_##x, 0 ;\
|
|||
machdep_sys_##x: ;\
|
|||
.frame sp,0,ra ;\
|
|||
ldiq v0, SYS_##x ;\
|
|||
CHMK() ;\
|
|||
beq a3, 2f ;\
|
|||
br gp, 1f ;\
|
|||
1: ;\
|
|||
/* Load gp so we can find cerror to jump to. */;\
|
|||
ldgp gp, 0(gp) ;\
|
|||
jmp zero, machdep_cerror ;\
|
|||
2:
|
|||
|
|||
#define XSYSCALL(x) SYSCALL(x) ; ret ; .end machdep_sys_##x
|
|||
|
|||
.globl machdep_cerror
|
|||
machdep_cerror:
|
|||
br t0, 1f
|
|||
1:
|
|||
ldgp gp, 0(t0)
|
|||
stl v0, errno
|
|||
#if 0
|
|||
ldiq v0, -1
|
|||
#else
|
|||
subq zero, v0, v0
|
|||
#endif
|
|||
ret
|
|||
|
|||
/* The fork system call is special... */
|
|||
SYSCALL(fork)
|
|||
cmovne a4, 0, v0
|
|||
ret
|
|||
.end machdep_sys_fork
|
|||
|
|||
/* So is the sigsuspend system call */
|
|||
.align 4
|
|||
.globl machdep_sys_sigsuspend
|
|||
.ent machdep_sys_sigsuspend, 0
|
|||
machdep_sys_sigsuspend:
|
|||
.frame sp,0,ra
|
|||
|
|||
bis a0, a0, a1
|
|||
ldq a0, 0(a1)
|
|||
ldiq v0, SYS_sigsuspend
|
|||
CHMK()
|
|||
ret
|
|||
.end machdep_sys_sigsuspend
|
|||
|
|||
/* More stuff ... */
|
|||
.align 4
|
|||
.globl machdep_restore_from_setjmp
|
|||
.ent machdep_restore_from_setjmp, 0
|
|||
machdep_restore_from_setjmp:
|
|||
.frame sp, 16, ra
|
|||
ldgp gp, 0(t12)
|
|||
lda sp, -16(sp)
|
|||
stq ra, 0(sp)
|
|||
ldq v0, 280(a0)
|
|||
subq v0, 0x00000000acedbade, t0
|
|||
bne t0, botch
|
|||
cmoveq a1, 0x1, a1
|
|||
stq a1, 32(a0)
|
|||
ldiq v0, 0x67
|
|||
call_pal 0x83
|
|||
botch:
|
|||
/* This should cause the program to crash. Eventually, fix it
|
|||
up to print a message first. */
|
|||
jsr abort
|
|||
.end machdep_restore_from_setjmp
|
