URL
https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk
Subversion Repositories openrisc_2011-10-31
[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [sparc/] [libsys/] [syscallasm.h] - Rev 180
Go to most recent revision | Compare with Previous | Blame | View Log
#ifndef _SYSCALLASM_H_ #define _SYSCALLASM_H_ /* * This file defines the system calls for SPARC for the assembler. * Anything C-ish is not allowed in this file. * C files should include syscall.h. */ #include "syscall.h" /* Some macros for writing assember syscall stubs. */ #ifdef SVR4 #define TEXT_SECTION .section ".text" #define DATA_SECTION .section ".data" #define ALIGN(x) .align x #define GLOBAL(sym) .global sym #define WORD(x) .long x #define ASM_SYMBOL(name) name #define ASM_PRIVATE_SYMBOL(name) _##name #define SYSCALL_TRAP 8 #else #define TEXT_SECTION .text #define DATA_SECTION .data #define ALIGN(x) .align x #define GLOBAL(sym) .global sym #define WORD(x) .word x #define ASM_SYMBOL(name) _##name #define ASM_PRIVATE_SYMBOL(name) name #define SYSCALL_TRAP 0 #endif #define defsyscall(name, n) \ TEXT_SECTION ; \ ALIGN (4) ; \ GLOBAL (ASM_SYMBOL (name)) ; \ ASM_SYMBOL (name): \ mov n,%g1 ; \ ta SYSCALL_TRAP ; \ bcc noerr ; \ sethi %hi (ASM_PRIVATE_SYMBOL (cerror)),%g1 ; \ or %g1,%lo (ASM_PRIVATE_SYMBOL (cerror)),%g1 ; \ jmpl %g1+%g0,%g0 ; \ nop ; \ noerr: \ jmpl %o7+8,%g0 ; \ nop /* Support for reentrant syscalls. The "struct _reent *" arg is always the the first one. After that we allow up to four additional args. We could allow more, but that's all we need for now. It may seem inefficient to have the reent arg be the first one as it means copying all the other args into place (as opposed to making the reent arg the last one in which case there wouldn't be any copying). I chose a clean design over an extra four instructions in a system call. All other reentrant functions use the first arg this way. ??? Of course this scheme breaks down if we need to support 6 or more args. And of course the system calls aren't *really* reentrant. The intent is to exercise the reentrancy framework rather than provide/claim real reentrancy for this port. */ #define defsyscall_r(name, n) \ TEXT_SECTION ; \ ALIGN (4) ; \ GLOBAL (ASM_SYMBOL (name)) ; \ ASM_SYMBOL (name): \ mov n,%g1 ; \ mov %o0,%o5 ; \ mov %o1,%o0 ; \ mov %o2,%o1 ; \ mov %o3,%o2 ; \ mov %o4,%o3 ; \ ta SYSCALL_TRAP ; \ bcc noerr ; \ sethi %hi (ASM_PRIVATE_SYMBOL (cerror_r)),%g1 ; \ or %g1,%lo (ASM_PRIVATE_SYMBOL (cerror_r)),%g1 ; \ jmpl %g1+%g0,%g0 ; \ mov %o5,%o1 ; \ noerr: \ jmpl %o7+8,%g0 ; \ nop #define seterrno() \ sethi %hi (ASM_PRIVATE_SYMBOL (cerror)),%g1 ; \ or %g1,%lo (ASM_PRIVATE_SYMBOL (cerror)),%g1 ; \ jmpl %g1+%g0,%g0 ; \ nop #endif /* _SYSCALLASM_H_ */
Go to most recent revision | Compare with Previous | Blame | View Log