155 lines
5.1 KiB
C
155 lines
5.1 KiB
C
/* Definitions of target machine for GNU compiler,
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for powerpc machines running Linux.
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Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003
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Free Software Foundation, Inc.
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Contributed by Michael Meissner (meissner@cygnus.com).
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Don't assume anything about the header files. */
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#define NO_IMPLICIT_EXTERN_C
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#undef MD_EXEC_PREFIX
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#undef MD_STARTFILE_PREFIX
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#undef CPP_PREDEFINES
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#define CPP_PREDEFINES \
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"-DPPC -D__ELF__ -Dpowerpc -Acpu=powerpc -Amachine=powerpc"
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#undef CPP_OS_DEFAULT_SPEC
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#define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
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/* The GNU C++ standard library currently requires _GNU_SOURCE being
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defined on glibc-based systems. This temporary hack accomplishes this,
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it should go away as soon as libstdc++-v3 has a real fix. */
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#undef CPLUSPLUS_CPP_SPEC
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#define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
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#undef LINK_SHLIB_SPEC
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#define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
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#undef LIB_DEFAULT_SPEC
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#define LIB_DEFAULT_SPEC "%(lib_linux)"
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#undef STARTFILE_DEFAULT_SPEC
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#define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
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#undef ENDFILE_DEFAULT_SPEC
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#define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
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#undef LINK_START_DEFAULT_SPEC
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#define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
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#undef LINK_OS_DEFAULT_SPEC
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#define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
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#undef TARGET_VERSION
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#define TARGET_VERSION fprintf (stderr, " (PowerPC GNU/Linux)");
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/* Override rs6000.h definition. */
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#undef ASM_APP_ON
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#define ASM_APP_ON "#APP\n"
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/* Override rs6000.h definition. */
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#undef ASM_APP_OFF
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#define ASM_APP_OFF "#NO_APP\n"
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/* For backward compatibility, we must continue to use the AIX
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structure return convention. */
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#undef DRAFT_V4_STRUCT_RET
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#define DRAFT_V4_STRUCT_RET 1
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/* Do code reading to identify a signal frame, and set the frame
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state data appropriately. See unwind-dw2.c for the structs. */
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#ifdef IN_LIBGCC2
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#include <signal.h>
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#include <sys/ucontext.h>
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enum { SIGNAL_FRAMESIZE = 64 };
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#endif
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#define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \
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do { \
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unsigned char *pc_ = (CONTEXT)->ra; \
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struct sigcontext *sc_; \
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long new_cfa_; \
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int i_; \
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\
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/* li r0, 0x7777; sc (sigreturn old) */ \
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/* li r0, 0x0077; sc (sigreturn new) */ \
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/* li r0, 0x6666; sc (rt_sigreturn old) */ \
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/* li r0, 0x00AC; sc (rt_sigreturn new) */ \
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if (*(unsigned int *) (pc_+4) != 0x44000002) \
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break; \
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if (*(unsigned int *) (pc_+0) == 0x38007777 \
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|| *(unsigned int *) (pc_+0) == 0x38000077) \
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{ \
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struct sigframe { \
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char gap[SIGNAL_FRAMESIZE]; \
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struct sigcontext sigctx; \
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} *rt_ = (CONTEXT)->cfa; \
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sc_ = &rt_->sigctx; \
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} \
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else if (*(unsigned int *) (pc_+0) == 0x38006666 \
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|| *(unsigned int *) (pc_+0) == 0x380000AC) \
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{ \
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struct rt_sigframe { \
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char gap[SIGNAL_FRAMESIZE]; \
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unsigned long _unused[2]; \
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struct siginfo *pinfo; \
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void *puc; \
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struct siginfo info; \
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struct ucontext uc; \
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} *rt_ = (CONTEXT)->cfa; \
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sc_ = &rt_->uc.uc_mcontext; \
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} \
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else \
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break; \
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\
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new_cfa_ = sc_->regs->gpr[STACK_POINTER_REGNUM]; \
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(FS)->cfa_how = CFA_REG_OFFSET; \
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(FS)->cfa_reg = STACK_POINTER_REGNUM; \
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(FS)->cfa_offset = new_cfa_ - (long) (CONTEXT)->cfa; \
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\
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for (i_ = 0; i_ < 32; i_++) \
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if (i_ != STACK_POINTER_REGNUM) \
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{ \
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(FS)->regs.reg[i_].how = REG_SAVED_OFFSET; \
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(FS)->regs.reg[i_].loc.offset \
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= (long)&(sc_->regs->gpr[i_]) - new_cfa_; \
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} \
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\
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(FS)->regs.reg[LINK_REGISTER_REGNUM].how = REG_SAVED_OFFSET; \
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(FS)->regs.reg[LINK_REGISTER_REGNUM].loc.offset \
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= (long)&(sc_->regs->link) - new_cfa_; \
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\
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/* The unwinder expects the IP to point to the following insn, \
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whereas the kernel returns the address of the actual \
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faulting insn. We store NIP+4 in an unused register slot to \
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get the same result for multiple evaluation of the same signal \
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frame. */ \
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sc_->regs->gpr[47] = sc_->regs->nip + 4; \
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(FS)->regs.reg[CR0_REGNO].how = REG_SAVED_OFFSET; \
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(FS)->regs.reg[CR0_REGNO].loc.offset \
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= (long)&(sc_->regs->gpr[47]) - new_cfa_; \
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(FS)->retaddr_column = CR0_REGNO; \
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goto SUCCESS; \
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} while (0)
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