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binutils: add support for non-pic handling and use it in the codesourcery based gcc, fixes mips support for this toolchain 

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18070 3c298f89-4303-0410-b956-a3cf2f4a3e73
master
Felix Fietkau 2009-10-19 07:41:33 +00:00
parent 48bba4c0b5
commit db56f6acc3
2 changed files with 202 additions and 23 deletions
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202
toolchain/binutils/patches/2.19.1/200-mips_non_pic.patch Normal file
View File

@ -0,0 +1,202 @@
--- a/bfd/elf32-mips.c
+++ b/bfd/elf32-mips.c
@@ -1662,6 +1662,15 @@ static const struct ecoff_debug_swap mip
#define elf_backend_plt_readonly 1
#define elf_backend_plt_sym_val _bfd_mips_elf_plt_sym_val
+/* Most MIPS ELF files do not contain a traditional PLT; only VxWorks
+ and non-PIC dynamic executables do. These settings only affect
+ _bfd_elf_create_dynamic_sections, which is only called when we
+ do want a traditional PLT. */
+#undef elf_backend_want_plt_sym
+#define elf_backend_want_plt_sym 1
+#undef elf_backend_plt_readonly
+#define elf_backend_plt_readonly 1
+
#define elf_backend_discard_info _bfd_mips_elf_discard_info
#define elf_backend_ignore_discarded_relocs \
_bfd_mips_elf_ignore_discarded_relocs
@@ -1686,6 +1695,8 @@ static const struct ecoff_debug_swap mip
#define bfd_elf32_bfd_print_private_bfd_data \
_bfd_mips_elf_print_private_bfd_data
+#define elf_backend_plt_sym_val _bfd_mips_elf_plt_sym_val
+
/* Support for SGI-ish mips targets. */
#define TARGET_LITTLE_SYM bfd_elf32_littlemips_vec
#define TARGET_LITTLE_NAME "elf32-littlemips"
@@ -1789,6 +1800,7 @@ mips_vxworks_final_write_processing (bfd
#undef elf_backend_additional_program_headers
#undef elf_backend_modify_segment_map
#undef elf_backend_symbol_processing
+#undef elf_backend_plt_sym_val
/* NOTE: elf_backend_rela_normal is not defined for MIPS. */
#include "elf32-target.h"
--- a/bfd/elfxx-mips.c
+++ b/bfd/elfxx-mips.c
@@ -677,6 +677,11 @@ static bfd *reldyn_sorting_bfd;
/* Nonzero if ABFD is using NewABI conventions. */
#define NEWABI_P(abfd) (ABI_N32_P (abfd) || ABI_64_P (abfd))
+/* Nonzero if ABFD is a non-PIC object. */
+#define NON_PIC_P(abfd) \
+ (((elf_elfheader (abfd)->e_flags & EF_MIPS_PIC) == 0) \
+ && ((elf_elfheader (abfd)->e_flags & EF_MIPS_CPIC) == EF_MIPS_CPIC))
+
/* The IRIX compatibility level we are striving for. */
#define IRIX_COMPAT(abfd) \
(get_elf_backend_data (abfd)->elf_backend_mips_irix_compat (abfd))
@@ -689,6 +694,9 @@ static bfd *reldyn_sorting_bfd;
#define MIPS_ELF_OPTIONS_SECTION_NAME(abfd) \
(NEWABI_P (abfd) ? ".MIPS.options" : ".options")
+/* The name of the section holding non-PIC to PIC call stubs. */
+#define NON_PIC_TO_PIC_STUB_SECTION_NAME ".MIPS.pic_stubs"
+
/* True if NAME is the recognized name of any SHT_MIPS_OPTIONS section.
Some IRIX system files do not use MIPS_ELF_OPTIONS_SECTION_NAME. */
#define MIPS_ELF_OPTIONS_SECTION_NAME_P(NAME) \
@@ -7583,7 +7591,9 @@ _bfd_mips_elf_check_relocs (bfd *abfd, s
/* We need a stub, not a plt entry for the undefined
function. But we record it as if it needs plt. See
- _bfd_elf_adjust_dynamic_symbol. */
+ _bfd_elf_adjust_dynamic_symbol. Note that these relocations
+ are always used for PIC calls, even when using the new
+ non-PIC ABI. */
h->needs_plt = 1;
h->type = STT_FUNC;
}
@@ -7689,6 +7699,8 @@ _bfd_mips_elf_check_relocs (bfd *abfd, s
case R_MIPS_32:
case R_MIPS_REL32:
case R_MIPS_64:
+ if (h != NULL)
+ h->non_got_ref = TRUE;
/* In VxWorks executables, references to external symbols
are handled using copy relocs or PLT stubs, so there's
no need to add a .rela.dyn entry for this relocation. */
@@ -7744,11 +7756,21 @@ _bfd_mips_elf_check_relocs (bfd *abfd, s
case R_MIPS_GPREL16:
case R_MIPS_LITERAL:
case R_MIPS_GPREL32:
+ if (h != NULL
+ && (r_type == R_MIPS_GPREL16 || r_type == R_MIPS_GPREL32))
+ h->non_got_ref = TRUE;
+
if (SGI_COMPAT (abfd))
mips_elf_hash_table (info)->compact_rel_size +=
sizeof (Elf32_External_crinfo);
break;
+ case R_MIPS_HI16:
+ case R_MIPS_LO16:
+ if (h != NULL && strcmp (h->root.root.string, "_gp_disp") != 0)
+ h->non_got_ref = TRUE;
+ break;
+
/* This relocation describes the C++ object vtable hierarchy.
Reconstruct it for later use during GC. */
case R_MIPS_GNU_VTINHERIT:
@@ -7771,20 +7793,20 @@ _bfd_mips_elf_check_relocs (bfd *abfd, s
/* We must not create a stub for a symbol that has relocations
related to taking the function's address. This doesn't apply to
- VxWorks, where CALL relocs refer to a .got.plt entry instead of
- a normal .got entry. */
+ VxWorks or the non-PIC ABI, where CALL relocs refer to a
+ .got.plt entry instead of a normal .got entry. */
if (!htab->is_vxworks && h != NULL)
switch (r_type)
{
- default:
- ((struct mips_elf_link_hash_entry *) h)->no_fn_stub = TRUE;
- break;
case R_MIPS16_CALL16:
case R_MIPS_CALL16:
case R_MIPS_CALL_HI16:
case R_MIPS_CALL_LO16:
case R_MIPS_JALR:
break;
+ default:
+ ((struct mips_elf_link_hash_entry *) h)->no_fn_stub = TRUE;
+ break;
}
/* See if this reloc would need to refer to a MIPS16 hard-float stub,
@@ -12458,7 +12480,9 @@ _bfd_mips_elf_merge_private_bfd_data (bf
break;
}
}
- if (null_input_bfd)
+ /* Dynamic objects normally have no sections, and do not reach
+ here - but they might if used as DYNOBJ. */
+ if (null_input_bfd || (ibfd->flags & DYNAMIC) != 0)
return TRUE;
ok = TRUE;
--- a/bfd/elfxx-mips.h
+++ b/bfd/elfxx-mips.h
@@ -63,6 +63,9 @@ extern bfd_boolean _bfd_mips_elf_finish_
extern bfd_boolean _bfd_mips_vxworks_finish_dynamic_symbol
(bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
Elf_Internal_Sym *);
+extern bfd_boolean _bfd_mips_nonpic_finish_dynamic_symbol
+ (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
+ Elf_Internal_Sym *);
extern bfd_boolean _bfd_mips_elf_finish_dynamic_sections
(bfd *, struct bfd_link_info *);
extern void _bfd_mips_elf_final_write_processing
@@ -153,6 +156,15 @@ extern const struct bfd_elf_special_sect
extern bfd_boolean _bfd_mips_elf_common_definition (Elf_Internal_Sym *);
+extern bfd_vma _bfd_mips_elf_plt_sym_val
+ (bfd_vma, const asection *, const arelent *);
+extern void _bfd_mips_elf_begin_write_processing
+ (bfd *abfd, struct bfd_link_info *link_info);
+extern bfd_boolean bfd_mips_elf_maybe_create_non_pic_to_pic_stubs_section
+ (struct bfd_link_info *);
+extern void _bfd_mips_post_process_headers
+ (bfd *abfd, struct bfd_link_info *link_info);
+
#define elf_backend_common_definition _bfd_mips_elf_common_definition
#define elf_backend_name_local_section_symbols \
_bfd_mips_elf_name_local_section_symbols
--- a/gas/config/tc-mips.c
+++ b/gas/config/tc-mips.c
@@ -1874,6 +1874,12 @@ md_begin (void)
as_bad (_("-G may not be used in position-independent code"));
g_switch_value = 0;
}
+ else if (mips_abicalls)
+ {
+ if (g_switch_seen && g_switch_value != 0)
+ as_bad (_("-G may not be used with abicalls"));
+ g_switch_value = 0;
+ }
if (! bfd_set_arch_mach (stdoutput, bfd_arch_mips, file_mips_arch))
as_warn (_("Could not set architecture and machine"));
@@ -11254,6 +11260,8 @@ struct option md_longopts[] =
{"mno-pdr", no_argument, NULL, OPTION_NO_PDR},
#define OPTION_MVXWORKS_PIC (OPTION_ELF_BASE + 12)
{"mvxworks-pic", no_argument, NULL, OPTION_MVXWORKS_PIC},
+#define OPTION_NON_PIC_ABICALLS (OPTION_ELF_BASE + 13)
+ {"mnon-pic-abicalls", no_argument, NULL, OPTION_NON_PIC_ABICALLS},
#endif /* OBJ_ELF */
{NULL, no_argument, NULL, 0}
@@ -11672,6 +11680,11 @@ md_parse_option (int c, char *arg)
case OPTION_MVXWORKS_PIC:
mips_pic = VXWORKS_PIC;
break;
+
+ case OPTION_NON_PIC_ABICALLS:
+ mips_pic = NO_PIC;
+ mips_abicalls = TRUE;
+ break;
#endif /* OBJ_ELF */
default:

23
toolchain/gcc/patches/4.3.3+cs/001-no_mips_nonpic_default.patch
View File

@ -1,23 +0,0 @@
--- a/gcc/config/mips/linux.h
+++ b/gcc/config/mips/linux.h
@@ -75,8 +75,7 @@ along with GCC; see the file COPYING3.
%{static:-static}}}"
#undef SUBTARGET_ASM_SPEC
-#define SUBTARGET_ASM_SPEC \
- "%{mabi=64: -64} %{mabicalls:%{fpic|fPIC|fpie|fPIE:-KPIC;:-mnon-pic-abicalls}}"
+#define SUBTARGET_ASM_SPEC "%{mabi=64: -64} %{!mno-abicalls:-KPIC}"
/* The MIPS assembler has different syntax for .set. We set it to
.dummy to trap any errors. */
--- a/gcc/config/mips/linux64.h
+++ b/gcc/config/mips/linux64.h
@@ -28,7 +28,7 @@ NO_SHARED_SPECS \
#undef SUBTARGET_ASM_SPEC
#define SUBTARGET_ASM_SPEC "\
-%{mabicalls:%{fpic|fPIC|fpie|fPIE:-KPIC;:-mnon-pic-abicalls}} \
+%{!fno-PIC:%{!fno-pic:-KPIC}} \
%{fno-PIC:-non_shared} %{fno-pic:-non_shared}"
#undef LIB_SPEC