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