| /* Definitions for Intel 386 running Linux-based GNU systems with ELF format. |
| Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2001 Free Software Foundation, Inc. |
| Contributed by Eric Youngdale. |
| Modified for stabs-in-ELF by H.J. Lu. |
| |
| This file is part of GNU CC. |
| |
| GNU CC 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. |
| |
| GNU CC 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 GNU CC; see the file COPYING. If not, write to |
| the Free Software Foundation, 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #define LINUX_DEFAULT_ELF |
| |
| /* Output at beginning of assembler file. */ |
| /* The .file command should always begin the output. */ |
| #undef ASM_FILE_START |
| #define ASM_FILE_START(FILE) \ |
| do { \ |
| output_file_directive (FILE, main_input_filename); \ |
| if (ix86_asm_dialect == ASM_INTEL) \ |
| fputs ("\t.intel_syntax\n", FILE); \ |
| } while (0) |
| |
| #undef TARGET_VERSION |
| #define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)"); |
| |
| /* The svr4 ABI for the i386 says that records and unions are returned |
| in memory. */ |
| #undef DEFAULT_PCC_STRUCT_RETURN |
| #define DEFAULT_PCC_STRUCT_RETURN 1 |
| |
| #undef ASM_COMMENT_START |
| #define ASM_COMMENT_START "#" |
| |
| #undef DBX_REGISTER_NUMBER |
| #define DBX_REGISTER_NUMBER(n) \ |
| (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n]) |
| |
| /* Output assembler code to FILE to call the profiler. |
| To the best of my knowledge, no Linux libc has required the label |
| argument to mcount. */ |
| |
| #define NO_PROFILE_COUNTERS |
| |
| #undef FUNCTION_PROFILER |
| #define FUNCTION_PROFILER(FILE, LABELNO) \ |
| { \ |
| if (flag_pic) \ |
| fprintf (FILE, "\tcall\t*mcount@GOT(%%ebx)\n"); \ |
| else \ |
| fprintf (FILE, "\tcall\tmcount\n"); \ |
| } |
| |
| /* True if it is possible to profile code that does not have a frame |
| pointer. |
| |
| The GLIBC version of mcount for the x86 assumes that there is a |
| frame, so we cannot allow profiling without a frame pointer. */ |
| |
| #undef TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER |
| #define TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER false |
| |
| #undef SIZE_TYPE |
| #define SIZE_TYPE "unsigned int" |
| |
| #undef PTRDIFF_TYPE |
| #define PTRDIFF_TYPE "int" |
| |
| #undef WCHAR_TYPE |
| #define WCHAR_TYPE "long int" |
| |
| #undef WCHAR_TYPE_SIZE |
| #define WCHAR_TYPE_SIZE BITS_PER_WORD |
| |
| #undef CPP_PREDEFINES |
| #define CPP_PREDEFINES "-D__ELF__ -Dunix -Dlinux -Asystem=posix" |
| |
| #undef CPP_SPEC |
| #ifdef USE_GNULIBC_1 |
| #define CPP_SPEC "%(cpp_cpu) %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE}" |
| #else |
| #define CPP_SPEC "%(cpp_cpu) %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}" |
| #endif |
| |
| #undef CC1_SPEC |
| #define CC1_SPEC "%(cc1_cpu) %{profile:-p}" |
| |
| /* Provide a LINK_SPEC appropriate for Linux. Here we provide support |
| for the special GCC options -static and -shared, which allow us to |
| link things in one of these three modes by applying the appropriate |
| combinations of options at link-time. We like to support here for |
| as many of the other GNU linker options as possible. But I don't |
| have the time to search for those flags. I am sure how to add |
| support for -soname shared_object_name. H.J. |
| |
| I took out %{v:%{!V:-V}}. It is too much :-(. They can use |
| -Wl,-V. |
| |
| When the -shared link option is used a final link is not being |
| done. */ |
| |
| /* If ELF is the default format, we should not use /lib/elf. */ |
| |
| #undef LINK_SPEC |
| #ifdef USE_GNULIBC_1 |
| #ifndef LINUX_DEFAULT_ELF |
| #define LINK_SPEC "-m elf_i386 %{shared:-shared} \ |
| %{!shared: \ |
| %{!ibcs: \ |
| %{!static: \ |
| %{rdynamic:-export-dynamic} \ |
| %{!dynamic-linker:-dynamic-linker /lib/elf/ld-linux.so.1} \ |
| %{!rpath:-rpath /lib/elf/}} %{static:-static}}}" |
| #else |
| #define LINK_SPEC "-m elf_i386 %{shared:-shared} \ |
| %{!shared: \ |
| %{!ibcs: \ |
| %{!static: \ |
| %{rdynamic:-export-dynamic} \ |
| %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.1}} \ |
| %{static:-static}}}" |
| #endif |
| #else |
| #define LINK_SPEC "-m elf_i386 %{shared:-shared} \ |
| %{!shared: \ |
| %{!ibcs: \ |
| %{!static: \ |
| %{rdynamic:-export-dynamic} \ |
| %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} \ |
| %{static:-static}}}" |
| #endif |
| |
| /* A C statement (sans semicolon) to output to the stdio stream |
| FILE the assembler definition of uninitialized global DECL named |
| NAME whose size is SIZE bytes and alignment is ALIGN bytes. |
| Try to use asm_output_aligned_bss to implement this macro. */ |
| |
| #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ |
| asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) |
| |
| /* A C statement to output to the stdio stream FILE an assembler |
| command to advance the location counter to a multiple of 1<<LOG |
| bytes if it is within MAX_SKIP bytes. |
| |
| This is used to align code labels according to Intel recommendations. */ |
| |
| #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN |
| #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \ |
| do { \ |
| if ((LOG) != 0) { \ |
| if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ |
| else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ |
| } \ |
| } while (0) |
| #endif |
| |
| #if defined(__PIC__) && defined (USE_GNULIBC_1) |
| /* This is a kludge. The i386 GNU/Linux dynamic linker needs ___brk_addr, |
| __environ and atexit (). We have to make sure they are in the .dynsym |
| section. We accomplish it by making a dummy call here. This |
| code is never reached. */ |
| |
| #define CRT_END_INIT_DUMMY \ |
| do \ |
| { \ |
| extern void *___brk_addr; \ |
| extern char **__environ; \ |
| \ |
| ___brk_addr = __environ; \ |
| atexit (0); \ |
| } \ |
| while (0) |
| #endif |
| |
| /* Handle special EH pointer encodings. Absolute, pc-relative, and |
| indirect are handled automatically. */ |
| #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \ |
| do { \ |
| if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \ |
| { \ |
| fputs (ASM_LONG, FILE); \ |
| assemble_name (FILE, XSTR (ADDR, 0)); \ |
| fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \ |
| goto DONE; \ |
| } \ |
| } while (0) |
| |
| /* Used by crtstuff.c to initialize the base of data-relative relocations. |
| These are GOT relative on x86, so return the pic register. */ |
| #ifdef __PIC__ |
| #define CRT_GET_RFIB_DATA(BASE) \ |
| { \ |
| register void *ebx_ __asm__("ebx"); \ |
| BASE = ebx_; \ |
| } |
| #else |
| #define CRT_GET_RFIB_DATA(BASE) \ |
| __asm__ ("call\t.LPR%=\n" \ |
| ".LPR%=:\n\t" \ |
| "popl\t%0\n\t" \ |
| /* Due to a GAS bug, this cannot use EAX. That encodes \ |
| smaller than the traditional EBX, which results in the \ |
| offset being off by one. */ \ |
| "addl\t$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0" \ |
| : "=d"(BASE)) |
| #endif |
| |
| /* Do code reading to identify a signal frame, and set the frame |
| state data appropriately. See unwind-dw2.c for the structs. */ |
| |
| #ifdef IN_LIBGCC2 |
| #include <signal.h> |
| #include <sys/ucontext.h> |
| #endif |
| |
| #define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \ |
| do { \ |
| unsigned char *pc_ = (CONTEXT)->ra; \ |
| struct sigcontext *sc_; \ |
| long new_cfa_; \ |
| \ |
| /* popl %eax ; movl $__NR_sigreturn,%eax ; int $0x80 */ \ |
| if (*(unsigned short *)(pc_+0) == 0xb858 \ |
| && *(unsigned int *)(pc_+2) == 119 \ |
| && *(unsigned short *)(pc_+6) == 0x80cd) \ |
| sc_ = (CONTEXT)->cfa + 4; \ |
| /* movl $__NR_rt_sigreturn,%eax ; int $0x80 */ \ |
| else if (*(unsigned char *)(pc_+0) == 0xb8 \ |
| && *(unsigned int *)(pc_+1) == 173 \ |
| && *(unsigned short *)(pc_+5) == 0x80cd) \ |
| { \ |
| struct rt_sigframe { \ |
| int sig; \ |
| struct siginfo *pinfo; \ |
| void *puc; \ |
| struct siginfo info; \ |
| struct ucontext uc; \ |
| } *rt_ = (CONTEXT)->cfa; \ |
| sc_ = (struct sigcontext *) &rt_->uc.uc_mcontext; \ |
| } \ |
| else \ |
| break; \ |
| \ |
| new_cfa_ = sc_->esp; \ |
| (FS)->cfa_how = CFA_REG_OFFSET; \ |
| (FS)->cfa_reg = 4; \ |
| (FS)->cfa_offset = new_cfa_ - (long) (CONTEXT)->cfa; \ |
| \ |
| /* The SVR4 register numbering macros aren't usable in libgcc. */ \ |
| (FS)->regs.reg[0].how = REG_SAVED_OFFSET; \ |
| (FS)->regs.reg[0].loc.offset = (long)&sc_->eax - new_cfa_; \ |
| (FS)->regs.reg[3].how = REG_SAVED_OFFSET; \ |
| (FS)->regs.reg[3].loc.offset = (long)&sc_->ebx - new_cfa_; \ |
| (FS)->regs.reg[1].how = REG_SAVED_OFFSET; \ |
| (FS)->regs.reg[1].loc.offset = (long)&sc_->ecx - new_cfa_; \ |
| (FS)->regs.reg[2].how = REG_SAVED_OFFSET; \ |
| (FS)->regs.reg[2].loc.offset = (long)&sc_->edx - new_cfa_; \ |
| (FS)->regs.reg[6].how = REG_SAVED_OFFSET; \ |
| (FS)->regs.reg[6].loc.offset = (long)&sc_->esi - new_cfa_; \ |
| (FS)->regs.reg[7].how = REG_SAVED_OFFSET; \ |
| (FS)->regs.reg[7].loc.offset = (long)&sc_->edi - new_cfa_; \ |
| (FS)->regs.reg[5].how = REG_SAVED_OFFSET; \ |
| (FS)->regs.reg[5].loc.offset = (long)&sc_->ebp - new_cfa_; \ |
| (FS)->regs.reg[8].how = REG_SAVED_OFFSET; \ |
| (FS)->regs.reg[8].loc.offset = (long)&sc_->eip - new_cfa_; \ |
| (FS)->retaddr_column = 8; \ |
| goto SUCCESS; \ |
| } while (0) |