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lampret |
#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 "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 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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??? Of course this scheme breaks down if we need to support 6 or more args.
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And of course the system calls aren't *really* reentrant. The intent
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is to exercise the reentrancy framework rather than provide/claim
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real reentrancy for this port.
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*/
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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 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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