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46 lines
1.1 KiB
ArmAsm
46 lines
1.1 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 SIMPLE_SYSCALL(x) SYSCALL(x) ; ret ; .end machdep_sys_##x
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#define XSYSCALL(x) SIMPLE_SYSCALL(x)
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XSYSCALL(SYSCALL_NAME)
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