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Diffstat (limited to 'sysdeps/unix/sysv/linux/hppa/sysdep.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/hppa/sysdep.h | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/hppa/sysdep.h b/sysdeps/unix/sysv/linux/hppa/sysdep.h new file mode 100644 index 0000000000..73d9a38b1a --- /dev/null +++ b/sysdeps/unix/sysv/linux/hppa/sysdep.h @@ -0,0 +1,242 @@ +/* Assembler macros for PA-RISC. + Copyright (C) 1999 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper, <drepper@cygnus.com>, August 1999. + Linux/PA-RISC changes by Philipp Rumpf, <prumpf@tux.org>, March 2000. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <asm/unistd.h> +#include <sysdeps/generic/sysdep.h> +#include <sys/syscall.h> +#include "config.h" + +#ifndef ASM_LINE_SEP +#define ASM_LINE_SEP ; +#endif + +#undef SYS_ify +#define SYS_ify(syscall_name) (__NR_##syscall_name) + + +#ifdef __ASSEMBLER__ + +/* Syntactic details of assembler. */ + +#define ALIGNARG(log2) log2 + +/* For Linux we can use the system call table in the header file + /usr/include/asm/unistd.h + of the kernel. But these symbols do not follow the SYS_* syntax + so we have to redefine the `SYS_ify' macro here. */ +#undef SYS_ify +#define SYS_ify(syscall_name) __NR_##syscall_name + +/* ELF-like local names start with `.L'. */ +#undef L +#define L(name) .L##name + +/* Linux uses a negative return value to indicate syscall errors, + unlike most Unices, which use the condition codes' carry flag. + + Since version 2.1 the return value of a system call might be + negative even if the call succeeded. E.g., the `lseek' system call + might return a large offset. Therefore we must not anymore test + for < 0, but test for a real error by making sure the value in %eax + is a real error number. Linus said he will make sure the no syscall + returns a value in -1 .. -4095 as a valid result so we can safely + test with -4095. */ + +/* We don't want the label for the error handle to be global when we define + it here. */ +#ifdef PIC +# define SYSCALL_ERROR_LABEL 0f +#else +# define SYSCALL_ERROR_LABEL syscall_error +#endif + +/* Define an entry point visible from C. + + There is currently a bug in gdb which prevents us from specifying + incomplete stabs information. Fake some entries here which specify + the current source file. */ +#define ENTRY(name) \ + .text ASM_LINE_SEP \ + .export C_SYMBOL_NAME(name) ASM_LINE_SEP \ + .type C_SYMBOL_NAME(name),@function ASM_LINE_SEP \ + C_LABEL(name) \ + CALL_MCOUNT + +#define ret \ + bv 0(2) ASM_LINE_SEP \ + nop + +#undef END +#define END(name) \ +1: .size C_SYMBOL_NAME(name),1b-C_SYMBOL_NAME(name) + +/* If compiled for profiling, call `mcount' at the start of each function. */ +#ifdef PROF +/* The mcount code relies on a normal frame pointer being on the stack + to locate our caller, so push one just for its benefit. */ +#define CALL_MCOUNT /* XXX */ +#else +#define CALL_MCOUNT /* Do nothing. */ +#endif + +/* syscall wrappers consist of + #include <sysdep.h> + PSEUDO(...) + ret + PSEUDO_END(...) + + which means + ENTRY(name) + DO_CALL(...) + nop + bv 0(2) + nop +*/ + +#define PSEUDO(name, syscall_name, args) \ + ENTRY (name) \ + DO_CALL(args, syscall_name) ASM_LINE_SEP \ + nop + +#undef PSEUDO_END +#define PSEUDO_END(name) \ + END (name) + +#define JUMPTARGET(name) name +#define SYSCALL_PIC_SETUP /* Nothing. */ + +/* Linux takes system call arguments in registers: + syscall number gr20 + arg 1 gr26 + arg 2 gr25 + arg 3 gr24 + arg 4 gr23 + arg 5 gr22 + arg 6 gr21 + + The compiler calls us by the C convention: + syscall number in the DO_CALL macro + arg 1 gr26 + arg 2 gr25 + arg 3 gr24 + arg 4 gr23 + arg 5 -52(gr30) + arg 6 -56(gr30) + + gr22 and gr21 are caller-saves, so we can just load the arguments + there and generally be happy. */ + +/* the cmpb...no_error code below inside DO_CALL + * is intended to mimic the if (__sys_res...) + * code inside INLINE_SYSCALL + */ + +#undef DO_CALL +#define DO_CALL(args, syscall_name) \ + DOARGS_##args \ + ble 0x100(%sr2,%r0) ASM_LINE_SEP \ + ldi SYS_ify (syscall_name), %r20 ASM_LINE_SEP \ + ldi -0x1000,%r1 ASM_LINE_SEP \ + cmpb,>>=,n %r1,%ret0,0f ASM_LINE_SEP \ + stw %rp, -20(%sr0,%r30) ASM_LINE_SEP \ + stw %ret0, -24(%sr0,%r30) ASM_LINE_SEP \ + .import __errno_location,code ASM_LINE_SEP \ + bl __errno_location,%rp ASM_LINE_SEP \ + ldo 64(%r30), %r30 ASM_LINE_SEP \ + ldo -64(%r30), %r30 ASM_LINE_SEP \ + ldw -24(%r30), %r26 ASM_LINE_SEP \ + sub %r0, %r26, %r26 ASM_LINE_SEP \ + stw %r26, 0(%sr0,%ret0) ASM_LINE_SEP \ + ldo -1(%r0), %ret0 ASM_LINE_SEP \ + ldw -20(%r30), %rp ASM_LINE_SEP \ +0: ASM_LINE_SEP \ + UNDOARGS_##args + +#define DOARGS_0 /* nothing */ +#define DOARGS_1 /* nothing */ +#define DOARGS_2 /* nothing */ +#define DOARGS_3 /* nothing */ +#define DOARGS_4 /* nothing */ +#define DOARGS_5 ldw -52(%r30), %r22 ASM_LINE_SEP +#define DOARGS_6 ldw -52(%r30), %r22 ASM_LINE_SEP \ + ldw -56(%r30), %r21 ASM_LINE_SEP + + +#define UNDOARGS_0 /* nothing */ +#define UNDOARGS_1 /* nothing */ +#define UNDOARGS_2 /* nothing */ +#define UNDOARGS_3 /* nothing */ +#define UNDOARGS_4 /* nothing */ +#define UNDOARGS_5 /* nothing */ +#define UNDOARGS_6 /* nothing */ + +#else + +#undef INLINE_SYSCALL +#define INLINE_SYSCALL(name, nr, args...) ({ \ + unsigned long __sys_res; \ + { \ + register unsigned long __res asm("r28"); \ + LOAD_ARGS_##nr(args) \ + asm volatile( \ + "ble 0x100(%%sr2, %%r0)\n\t" \ + " ldi %1, %%r20" \ + : "=r" (__res) \ + : "i" (SYS_ify(name)) ASM_ARGS_##nr \ + ); \ + __sys_res = __res; \ + } \ + if (__sys_res >= (unsigned long)-4095) { \ + __set_errno(-__sys_res); \ + __sys_res == (unsigned long)-1; \ + } \ + __sys_res; \ +}) + +#define LOAD_ARGS_0() +#define LOAD_ARGS_1(r26) \ + register unsigned long __r26 __asm__("r26") = (unsigned long)r26; \ + LOAD_ARGS_0() +#define LOAD_ARGS_2(r26,r25) \ + register unsigned long __r25 __asm__("r25") = (unsigned long)r25; \ + LOAD_ARGS_1(r26) +#define LOAD_ARGS_3(r26,r25,r24) \ + register unsigned long __r24 __asm__("r24") = (unsigned long)r24; \ + LOAD_ARGS_2(r26,r25) +#define LOAD_ARGS_4(r26,r25,r24,r23) \ + register unsigned long __r23 __asm__("r23") = (unsigned long)r23; \ + LOAD_ARGS_3(r26,r25,r24) +#define LOAD_ARGS_5(r26,r25,r24,r23,r22) \ + register unsigned long __r22 __asm__("r22") = (unsigned long)r22; \ + LOAD_ARGS_4(r26,r25,r24,r23) +#define LOAD_ARGS_6(r26,r25,r24,r23,r22,r21) \ + register unsigned long __r21 __asm__("r21") = (unsigned long)r21; \ + LOAD_ARGS_5(r26,r25,r24,r23,r22) + +#define ASM_ARGS_0 +#define ASM_ARGS_1 , "r" (__r26) +#define ASM_ARGS_2 , "r" (__r26), "r" (__r25) +#define ASM_ARGS_3 , "r" (__r26), "r" (__r25), "r" (__r24) +#define ASM_ARGS_4 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23) +#define ASM_ARGS_5 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23), "r" (__r22) +#define ASM_ARGS_6 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23), "r" (__r22), "r" (__r21) + +#endif /* __ASSEMBLER__ */ |