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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [sparc64/] [sys/] [syscallasm.h] - Blame information for rev 207

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Line No. Rev Author Line
1 207 jeremybenn
#ifndef _SYSCALLASM_H_
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#define _SYSCALLASM_H_
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/*
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 * This file defines the system calls for SPARC for the assembler.
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 * Anything C-ish is not allowed in this file.
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 * C files should include syscall.h.
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 */
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#include <sys/syscall.h>
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/* Some macros for writing assember syscall stubs.  */
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#ifdef __svr4__
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#define TEXT_SECTION    .section ".text"
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#define DATA_SECTION    .section ".data"
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#define ALIGN(x)        .align x
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#define GLOBAL(sym)     .global sym
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#define WORD(x)         .long x
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#define ASM_SYMBOL(name) name
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#define ASM_PRIVATE_SYMBOL(name) _##name
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#define SYSCALL_TRAP    8
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#else
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#define TEXT_SECTION    .text
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#define DATA_SECTION    .data
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#define ALIGN(x)        .align x
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#define GLOBAL(sym)     .global sym
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#define WORD(x)         .word x
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#define ASM_SYMBOL(name) _##name
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#define ASM_PRIVATE_SYMBOL(name) name
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#define SYSCALL_TRAP    0
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#endif
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#define defsyscall(name, n) \
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        TEXT_SECTION ;                  \
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        ALIGN (4) ;                     \
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        GLOBAL (ASM_SYMBOL (name)) ;    \
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ASM_SYMBOL (name):                      \
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        mov     n,%g1 ;                 \
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        ta      %icc,SYSCALL_TRAP ;     \
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        bcc     noerr ;                 \
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        sethi   %hi (ASM_PRIVATE_SYMBOL (cerror)),%g1 ;         \
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        or      %g1,%lo (ASM_PRIVATE_SYMBOL (cerror)),%g1 ;     \
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        jmpl    %g1+%g0,%g0 ;           \
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        nop ;                           \
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noerr:                                  \
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        jmpl    %o7+8,%g0 ;             \
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        nop
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/* Support for reentrant syscalls.  The "struct _reent *" arg is always the
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   the first one.  After that we allow up to four additional args.  We could
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   allow more, but that's all we need for now.
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   It may seem inefficient to have the reent arg be the first one as it means
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   copying all the other args into place (as opposed to making the reent arg
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   the last one in which case there wouldn't be any copying).  I chose a clean
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   design over an extra four instructions in a system call.  All other
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   reentrant functions use the first arg this way.  */
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#define defsyscall_r(name, n) \
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        TEXT_SECTION ;                  \
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        ALIGN (4) ;                     \
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        GLOBAL (ASM_SYMBOL (name)) ;    \
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ASM_SYMBOL (name):                      \
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        mov     n,%g1 ;                 \
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        mov     %o0,%o5 ;               \
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        mov     %o1,%o0 ;               \
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        mov     %o2,%o1 ;               \
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        mov     %o3,%o2 ;               \
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        mov     %o4,%o3 ;               \
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        ta      %icc,SYSCALL_TRAP ;     \
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        bcc     noerr ;                 \
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        sethi   %hi (ASM_PRIVATE_SYMBOL (cerror_r)),%g1 ;       \
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        or      %g1,%lo (ASM_PRIVATE_SYMBOL (cerror_r)),%g1 ;   \
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        jmpl    %g1+%g0,%g0 ;           \
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        mov     %o5,%o1 ;               \
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noerr:                                  \
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        jmpl    %o7+8,%g0 ;             \
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        nop
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#define seterrno() \
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        sethi   %hi (ASM_PRIVATE_SYMBOL (cerror)),%g1 ;         \
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        or      %g1,%lo (ASM_PRIVATE_SYMBOL (cerror)),%g1 ;     \
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        jmpl    %g1+%g0,%g0 ;           \
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        nop
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#endif /* _SYSCALLASM_H_ */

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