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/* Definitions for Linux for S/390.
Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
Contributed by Hartmut Penner (hpenner@de.ibm.com) and
Ulrich Weigand (uweigand@de.ibm.com).
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
GCC 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 General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#ifndef _LINUX_H
#define _LINUX_H
/* Target specific version string. */
#ifdef DEFAULT_TARGET_64BIT
#undef TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (Linux for zSeries)");
#else
#undef TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (Linux for S/390)");
#endif
/* Target specific type definitions. */
/* ??? Do we really want long as size_t on 31-bit? */
#undef SIZE_TYPE
#define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "long unsigned int")
#undef PTRDIFF_TYPE
#define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
#undef WCHAR_TYPE
#define WCHAR_TYPE "int"
#undef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE 32
/* Target specific preprocessor settings. */
#define TARGET_OS_CPP_BUILTINS() \
do \
{ \
LINUX_TARGET_OS_CPP_BUILTINS(); \
if (flag_pic) \
{ \
builtin_define ("__PIC__"); \
builtin_define ("__pic__"); \
} \
} \
while (0)
/* Target specific assembler settings. */
#undef ASM_SPEC
#define ASM_SPEC "%{m31&m64}%{mesa&mzarch}%{march=*}"
/* Target specific linker settings. */
#ifdef DEFAULT_TARGET_64BIT
#define MULTILIB_DEFAULTS { "m64" }
#else
#define MULTILIB_DEFAULTS { "m31" }
#endif
#undef LINK_SPEC
#define LINK_SPEC \
"%{m31:-m elf_s390}%{m64:-m elf64_s390} \
%{shared:-shared} \
%{!shared: \
%{static:-static} \
%{!static: \
%{rdynamic:-export-dynamic} \
%{!dynamic-linker: \
%{m31:-dynamic-linker /lib/ld.so.1} \
%{m64:-dynamic-linker /lib/ld64.so.1}}}}"
#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
/* Do code reading to identify a signal frame, and set the frame
state data appropriately. See unwind-dw2.c for the structs. */
#define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \
do { \
unsigned char *pc_ = (CONTEXT)->ra; \
long new_cfa_; \
int i_; \
\
typedef struct \
{ \
unsigned long psw_mask; \
unsigned long psw_addr; \
unsigned long gprs[16]; \
unsigned int acrs[16]; \
unsigned int fpc; \
unsigned int __pad; \
double fprs[16]; \
} __attribute__ ((__aligned__ (8))) sigregs_; \
\
sigregs_ *regs_; \
int *signo_ = NULL; \
\
/* svc $__NR_sigreturn or svc $__NR_rt_sigreturn */ \
if (pc_[0] != 0x0a || (pc_[1] != 119 && pc_[1] != 173)) \
break; \
\
/* New-style RT frame: \
retcode + alignment (8 bytes) \
siginfo (128 bytes) \
ucontext (contains sigregs) */ \
if ((CONTEXT)->ra == (CONTEXT)->cfa) \
{ \
struct ucontext_ \
{ \
unsigned long uc_flags; \
struct ucontext_ *uc_link; \
unsigned long uc_stack[3]; \
sigregs_ uc_mcontext; \
} *uc_ = (CONTEXT)->cfa + 8 + 128; \
\
regs_ = &uc_->uc_mcontext; \
signo_ = (CONTEXT)->cfa + sizeof(long); \
} \
\
/* Old-style RT frame and all non-RT frames: \
old signal mask (8 bytes) \
pointer to sigregs */ \
else \
{ \
regs_ = *(sigregs_ **)((CONTEXT)->cfa + 8); \
\
/* Recent kernels store the signal number immediately after \
the sigregs; old kernels have the return trampoline at \
this location. */ \
if ((void *)(regs_ + 1) != (CONTEXT)->ra) \
signo_ = (int *)(regs_ + 1); \
} \
\
new_cfa_ = regs_->gprs[15] + 16*sizeof(long) + 32; \
(FS)->cfa_how = CFA_REG_OFFSET; \
(FS)->cfa_reg = 15; \
(FS)->cfa_offset = \
new_cfa_ - (long) (CONTEXT)->cfa + 16*sizeof(long) + 32; \
\
for (i_ = 0; i_ < 16; i_++) \
{ \
(FS)->regs.reg[i_].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[i_].loc.offset = \
(long)®s_->gprs[i_] - new_cfa_; \
} \
for (i_ = 0; i_ < 16; i_++) \
{ \
(FS)->regs.reg[16+i_].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[16+i_].loc.offset = \
(long)®s_->fprs[i_] - new_cfa_; \
} \
\
/* Load return addr from PSW into dummy register 32. */ \
\
(FS)->regs.reg[32].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[32].loc.offset = (long)®s_->psw_addr - new_cfa_; \
(FS)->retaddr_column = 32; \
\
/* If we got a SIGSEGV or a SIGBUS, the PSW address points *to* \
the faulting instruction, not after it. This causes the logic \
in unwind-dw2.c that decrements the RA to determine the correct \
CFI region to get confused. To fix that, we *increment* the RA \
here in that case. Note that we cannot modify the RA in place, \
and the frame state wants a *pointer*, not a value; thus we put \
the modified RA value into the unused register 33 slot of FS and \
have the register 32 save address point to that slot. \
\
Unfortunately, for regular signals on old kernels, we don't know \
the signal number. We default to not fiddling with the RA; \
that can fail in rare cases. Upgrade your kernel. */ \
\
if (signo_ && (*signo_ == 11 || *signo_ == 7)) \
{ \
(FS)->regs.reg[33].loc.exp = \
(unsigned char *)regs_->psw_addr + 1; \
(FS)->regs.reg[32].loc.offset = \
(long)&(FS)->regs.reg[33].loc.exp - new_cfa_; \
} \
\
goto SUCCESS; \
} while (0)
#endif
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