Skip to content

R
riscv-gcc-1
Commit bb1835d2 by Richard Kenner
Options

Extensive modifications to use ELF format as default. 

(LIB_SPEC): Don't use libc_p.a for -p. don't use libg.a unless for -ggdb.
(LINUX_DEFAULT_ELF): Defined.

From-SVN: r9256
parent 9e2fc7c0
Showing with 165 additions and 67 deletions
gcc/config/i386/linux.h
/* Definitions for Intel 386 running Linux /* Definitions for Intel 386 running Linux with ELF format
Copyright (C) 1992, 1994 Free Software Foundation, Inc. Copyright (C) 1994, 1995 Free Software Foundation, Inc.
Contributed by H.J. Lu (hjl@nynexst.com) Contributed by Eric Youngdale.
Modified for stabs-in-ELF by H.J. Lu.
This file is part of GNU CC. This file is part of GNU CC.
...@@ -18,35 +19,120 @@ You should have received a copy of the GNU General Public License ...@@ -18,35 +19,120 @@ You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#if 0 /* The FSF has fixed the known bugs. But ....... */ #define LINUX_DEFAULT_ELF
/* Linux has a hacked gas 1.38.1, which can handle repz, repnz /* A lie, I guess, but the general idea behind linux/ELF is that we are
and fildll. */ supposed to be outputting something that will assemble under SVr4.
This gets us pretty close. */
#define GOOD_GAS #include "i386/i386.h" /* Base i386 target machine definitions */
#endif #include "i386/att.h" /* Use the i386 AT&T assembler syntax */
#include "linux.h" /* some common stuff */
/* Don't assume anything about the header files. */
#define NO_IMPLICIT_EXTERN_C #undef TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)");
/* This is tested by i386/gas.h. */
#define YES_UNDERSCORES /* The svr4 ABI for the i386 says that records and unions are returned
in memory. */
#ifndef LINUX_ELF #undef DEFAULT_PCC_STRUCT_RETURN
#include "i386/gstabs.h" #define DEFAULT_PCC_STRUCT_RETURN 1
#endif
/* This is how to output an element of a case-vector that is relative.
/* Specify predefined symbols in preprocessor. */ This is only used for PIC code. See comments by the `casesi' insn in
i386.md for an explanation of the expression this outputs. */
#undef CPP_PREDEFINES #undef ASM_OUTPUT_ADDR_DIFF_ELT
#define CPP_PREDEFINES "-Dunix -Di386 -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(i386) -Amachine(i386)" #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL) \
fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
#undef CPP_SPEC
#if TARGET_CPU_DEFAULT == 2 /* Indicate that jump tables go in the text section. This is
#define CPP_SPEC "%{!m386:-D__i486__} %{posix:-D_POSIX_SOURCE}" necessary when compiling PIC code. */
#else #define JUMP_TABLES_IN_TEXT_SECTION
#define CPP_SPEC "%{m486:-D__i486__} %{posix:-D_POSIX_SOURCE}"
#endif /* Copy this from the svr4 specifications... */
/* Define the register numbers to be used in Dwarf debugging information.
The SVR4 reference port C compiler uses the following register numbers
in its Dwarf output code:
0 for %eax (gnu regno = 0)
1 for %ecx (gnu regno = 2)
2 for %edx (gnu regno = 1)
3 for %ebx (gnu regno = 3)
4 for %esp (gnu regno = 7)
5 for %ebp (gnu regno = 6)
6 for %esi (gnu regno = 4)
7 for %edi (gnu regno = 5)
The following three DWARF register numbers are never generated by
the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4
believes these numbers have these meanings.
8 for %eip (no gnu equivalent)
9 for %eflags (no gnu equivalent)
10 for %trapno (no gnu equivalent)
It is not at all clear how we should number the FP stack registers
for the x86 architecture. If the version of SDB on x86/svr4 were
a bit less brain dead with respect to floating-point then we would
have a precedent to follow with respect to DWARF register numbers
for x86 FP registers, but the SDB on x86/svr4 is so completely
broken with respect to FP registers that it is hardly worth thinking
of it as something to strive for compatibility with.
The verison of x86/svr4 SDB I have at the moment does (partially)
seem to believe that DWARF register number 11 is associated with
the x86 register %st(0), but that's about all. Higher DWARF
register numbers don't seem to be associated with anything in
particular, and even for DWARF regno 11, SDB only seems to under-
stand that it should say that a variable lives in %st(0) (when
asked via an `=' command) if we said it was in DWARF regno 11,
but SDB still prints garbage when asked for the value of the
variable in question (via a `/' command).
(Also note that the labels SDB prints for various FP stack regs
when doing an `x' command are all wrong.)
Note that these problems generally don't affect the native SVR4
C compiler because it doesn't allow the use of -O with -g and
because when it is *not* optimizing, it allocates a memory
location for each floating-point variable, and the memory
location is what gets described in the DWARF AT_location
attribute for the variable in question.
Regardless of the severe mental illness of the x86/svr4 SDB, we
do something sensible here and we use the following DWARF
register numbers. Note that these are all stack-top-relative
numbers.
11 for %st(0) (gnu regno = 8)
12 for %st(1) (gnu regno = 9)
13 for %st(2) (gnu regno = 10)
14 for %st(3) (gnu regno = 11)
15 for %st(4) (gnu regno = 12)
16 for %st(5) (gnu regno = 13)
17 for %st(6) (gnu regno = 14)
18 for %st(7) (gnu regno = 15)
*/
#undef DBX_REGISTER_NUMBER
#define DBX_REGISTER_NUMBER(n) \
((n) == 0 ? 0 \
: (n) == 1 ? 2 \
: (n) == 2 ? 1 \
: (n) == 3 ? 3 \
: (n) == 4 ? 6 \
: (n) == 5 ? 7 \
: (n) == 6 ? 5 \
: (n) == 7 ? 4 \
: ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \
: (-1))
/* Output assembler code to FILE to increment profiler label # LABELNO
for profiling a function entry. */
#undef FUNCTION_PROFILER
#define FUNCTION_PROFILER(FILE, LABELNO) \
{ \
if (flag_pic) \
{ \
fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n", \
LPREFIX, (LABELNO)); \
fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n"); \
} \
else \
{ \
fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO)); \
fprintf (FILE, "\tcall mcount\n"); \
} \
}
#undef SIZE_TYPE #undef SIZE_TYPE
#define SIZE_TYPE "unsigned int" #define SIZE_TYPE "unsigned int"
...@@ -60,53 +146,65 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ ...@@ -60,53 +146,65 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#undef WCHAR_TYPE_SIZE #undef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE BITS_PER_WORD #define WCHAR_TYPE_SIZE BITS_PER_WORD
#undef HAVE_ATEXIT #undef CPP_PREDEFINES
#define HAVE_ATEXIT #define CPP_PREDEFINES "-D__ELF__ -Dunix -Di386 -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(i386) -Amachine(i386)"
/* Linux uses ctype from glibc.a. I am not sure how complete it is.
For now, we play safe. It may change later. */
#if 0 #undef CPP_SPEC
#undef MULTIBYTE_CHARS #if TARGET_CPU_DEFAULT == 2
#define MULTIBYTE_CHARS 1 #define CPP_SPEC "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{!m386:-D__i486__} %{posix:-D_POSIX_SOURCE}"
#else
#define CPP_SPEC "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{m486:-D__i486__} %{posix:-D_POSIX_SOURCE}"
#endif #endif
#undef LIB_SPEC #undef LIB_SPEC
#if 1
/* We no longer link with libc_p.a or libg.a by default. If you
* want to profile or debug the Linux C library, please add
* -lc_p or -ggdb to LDFLAGS at the link time, respectively.
*/
#define LIB_SPEC \ #define LIB_SPEC \
"%{mieee-fp:-lieee} %{p*:-lgmon} %{!static:-lc} \ "%{!shared: %{mieee-fp:-lieee} %{p:-lgmon} %{pg:-lgmon} \
%{static:%{p*:-lc_p} %{!p:%{!pg:%{!g*:-lc} %{g*:-lg}}}}" %{!ggdb:-lc} %{ggdb:-lg}}"
#else
#undef STARTFILE_SPEC #define LIB_SPEC \
#define STARTFILE_SPEC "%{pg:gcrt0.o%s} %{!pg:%{p:gcrt0.o%s} %{!p:crt0.o%s}} %{static:-static}" "%{!shared: \
%{mieee-fp:-lieee} %{p:-lgmon -lc_p} %{pg:-lgmon -lc_p} \
%{!p:%{!pg:%{!g*:-lc} %{g*:-lg}}}}"
#endif
/* There are conflicting reports about whether this system uses /* Provide a LINK_SPEC appropriate for Linux. Here we provide support
a different assembler syntax. wilson@cygnus.com says # is right. */ for the special GCC options -static and -shared, which allow us to
#undef COMMENT_BEGIN link things in one of these three modes by applying the appropriate
#define COMMENT_BEGIN "#" 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.
#undef ASM_APP_ON I took out %{v:%{!V:-V}}. It is too much :-(. They can use
#define ASM_APP_ON "#APP\n" -Wl,-V.
#undef ASM_APP_OFF When the -shared link option is used a final link is not being
#define ASM_APP_OFF "#NO_APP\n" done. */
/* Don't default to pcc-struct-return, because gcc is the only compiler, and /* If ELF is the default format, we should not use /lib/elf. */
we want to retain compatibility with older gcc versions. */
#ifndef LINUX_ELF
#define DEFAULT_PCC_STRUCT_RETURN 0
#endif
/* We need that too. */
#define HANDLE_SYSV_PRAGMA
#undef LINK_SPEC #undef LINK_SPEC
#ifndef LINUX_DEFAULT_ELF
/* We want to pass -v to linker */ #define LINK_SPEC "-m elf_i386 %{shared:-shared} \
#if TARGET_CPU_DEFAULT == 2 %{!shared: \
#define LINK_SPEC "%{v:-dll-verbose} %{!m386:-m486}" %{!ibcs: \
%{!static: \
%{rdynamic:-export-dynamic} \
%{!dynamic-linker:-dynamic-linker /lib/elf/ld-linux.so.1} \
%{!rpath:-rpath /lib/elf/}} %{static:-static}}}"
#else #else
#define LINK_SPEC "%{v:-dll-verbose} %{m486:-m486}" #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 #endif
/* Get perform_* macros to build libgcc.a. */ /* Get perform_* macros to build libgcc.a. */
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment