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mit-pthreads/machdep/syscall-template-alpha-osf1.S

 

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#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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