Commit Graph

240 Commits

Author SHA1 Message Date
Szabolcs Nagy
71c2578a9b aarch64: add STO_AARCH64_VARIANT_PCS and DT_AARCH64_VARIANT_PCS
STO_AARCH64_VARIANT_PCS is a non-visibility st_other flag for marking
symbols that reference functions that may follow a variant PCS with
different register usage convention from the base PCS.

DT_AARCH64_VARIANT_PCS is a dynamic tag that marks ELF modules that
have R_*_JUMP_SLOT relocations for symbols marked with
STO_AARCH64_VARIANT_PCS (i.e. have variant PCS calls via a PLT).

	* elf/elf.h (STO_AARCH64_VARIANT_PCS): Define.
	(DT_AARCH64_VARIANT_PCS): Define.
2019-07-12 10:50:12 +01:00
Alan Modra
0572433b5b PowerPC64 ELFv2 PPC64_OPT_LOCALENTRY
ELFv2 functions with localentry:0 are those with a single entry point,
ie. global entry == local entry, that have no requirement on r2 or
r12 and guarantee r2 is unchanged on return.  Such an external
function can be called via the PLT without saving r2 or restoring it
on return, avoiding a common load-hit-store for small functions.

This patch implements the ld.so changes necessary for this
optimization.  ld.so needs to check that an optimized plt call
sequence is in fact calling a function implemented with localentry:0,
end emit a fatal error otherwise.

The elf/testobj6.c change is to stop "error while loading shared
libraries: expected localentry:0 `preload'" when running
elf/preloadtest, which we'd get otherwise.

	* elf/elf.h (PPC64_OPT_LOCALENTRY): Define.
	* sysdeps/alpha/dl-machine.h (elf_machine_fixup_plt): Add
	refsym and sym parameters.  Adjust callers.
	* sysdeps/aarch64/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/arm/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/generic/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/hppa/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/i386/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/ia64/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/m68k/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/microblaze/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/mips/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/nios2/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/powerpc/powerpc32/dl-machine.h (elf_machine_fixup_plt):
	Likewise.
	* sysdeps/s390/s390-32/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/s390/s390-64/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/sh/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/sparc/sparc32/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/sparc/sparc64/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/tile/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/x86_64/dl-machine.h (elf_machine_fixup_plt): Likewise.
	* sysdeps/powerpc/powerpc64/dl-machine.c (_dl_error_localentry): New.
	(_dl_reloc_overflow): Increase buffser size.  Formatting.
	* sysdeps/powerpc/powerpc64/dl-machine.h (ppc64_local_entry_offset):
	Delete reloc param, add refsym and sym.  Check optimized plt
	call stubs for localentry:0 functions.  Adjust callers.
	(elf_machine_fixup_plt, elf_machine_plt_conflict): Add refsym
	and sym parameters.  Adjust callers.
	(_dl_reloc_overflow): Move attribute.
	(_dl_error_localentry): Declare.
	* elf/dl-runtime.c (_dl_fixup): Save original sym.  Pass
	refsym and sym to elf_machine_fixup_plt.
	* elf/testobj6.c (preload): Call printf.
2017-06-14 10:47:25 +09:30
Paul Clarke
d031600dd2 Support auxilliary vector components for cache geometries.
Add support to getauxval() for new types to get L1, L2, L3 cache sizes,
cache line sizes, and cache associativities.  The new types for
getauxval() were added in the stream for Linux kernel v4.11 in commit
98a5f361b8625c6f4841d6ba013bbf0e80d08147.

	* elf/elf.h (AT_L1I_CACHESIZE, AT_L1I_CACHEGEOMETRY, AT_L1D_CACHESIZE,
	AT_L1D_CACHEGEOMETRY, AT_L2_CACHESIZE, AT_L2_CACHEGEOMETRY,
	AT_L3_CACHESIZE, AT_L3_CACHEGEOMETRY): New.  Add auxvec
	identifiers from kernel arch/powerpc/include/uapi/asm/auxvec.h.
2017-04-11 14:05:54 -03:00
Joseph Myers
bfff8b1bec Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
Will Newton
2c3d888304 elf/elf.h: Add missing Meta relocations
2016-07-19   Will Newton  <will.newton@gmail.com>

	* elf/elf.h (R_METAG_REL8, R_METAG_REL16, R_METAG_TLS_GD
	R_METAG_TLS_LDM, R_METAG_TLS_LDO_HI16, R_METAG_TLS_LDO_LO16,
	R_METAG_TLS_LDO, R_METAG_TLS_IE, R_METAG_TLS_IENONPIC,
	R_METAG_TLS_IENONPIC_HI16, R_METAG_TLS_IENONPIC_LO16,
	R_METAG_TLS_LE, R_METAG_TLS_LE_HI16, R_METAG_TLS_LE_LO16): New.
2016-07-19 15:53:35 +01:00
Khem Raj
41d0365882 elf: Define missing Meta architecture specific relocations 2016-07-18 21:36:29 +01:00
Richard Henderson
e402823ef3 elf.h: Add declarations for BPF
The EM_BPF number has been officially assigned, though it
has not yet been posted to the gabi webpage yet.

        * elf/elf.h (EM_BPF): New.
        (EM_NUM): Update.
        (R_BPF_NONE, R_BPF_MAP_FD): New.
2016-06-28 09:35:46 -07:00
Richard Henderson
94e73c95d9 elf.h: Sync with the gabi webpage
http://www.sco.com/developers/gabi/latest/ch4.eheader.html

Retrieved 2016-06-20.

        * elf/elf.h (EM_IAMCU, EM_SPU, EM_PDP10, EM_PDP11, EM_ARC_COMPACT,
        EM_VIDEOCORE, EM_TMM_GPP, EM_NS32K, EM_TPC, EM_SNP1K, EM_ST200,
        EM_IP2K, EM_MAX, EM_CR, EM_F2MC16, EM_MSP430, EM_BLACKFIN, EM_SE_C33,
        EM_SEP, EM_ARCA, EM_UNICORE, EM_EXCESS, EM_DXP, EM_ALTERA_NIOS2,
        EM_CRX, EM_XGATE, EM_C166, EM_M16C, EM_DSPIC30F, EM_CE, EM_M32C,
        EM_TSK3000, EM_RS08, EM_SHARC, EM_ECOG2, EM_SCORE7, EM_DSP24,
        EM_VIDEOCORE3, EM_LATTICEMICO32, EM_SE_C17, EM_TI_C6000, EM_TI_C2000,
        EM_TI_C5500, EM_TI_ARP32, EM_TI_PRU, EM_MMDSP_PLUS, EM_CYPRESS_M8C,
        EM_R32C, EM_TRIMEDIA, EM_QDSP6, EM_8051, EM_STXP7X, EM_NDS32,
        EM_ECOG1X, EM_MAXQ30, EM_XIMO16, EM_MANIK, EM_CRAYNV2, EM_RX,
        EM_METAG, EM_MCST_ELBRUS, EM_ECOG16, EM_CR16, EM_ETPU, EM_SLE9X,
        EM_L10M, EM_K10M, EM_AVR32, EM_STM8, EM_TILE64, EM_CUDA,
        EM_CLOUDSHIELD, EM_COREA_1ST, EM_COREA_2ND, EM_ARC_COMPACT2,
        EM_OPEN8, EM_RL78, EM_VIDEOCORE5, EM_78KOR, EM_56800EX, EM_BA1,
        EM_BA2, EM_XCORE, EM_MCHP_PIC, EM_KM32, EM_KMX32, EM_EMX16, EM_EMX8,
        EM_KVARC, EM_CDP, EM_COGE, EM_COOL, EM_NORC, EM_CSR_KALIMBA, EM_Z80,
        EM_VISIUM, EM_FT32, EM_MOXIE, EM_AMDGPU, EM_RISCV): New.
        (EM_NUM): Update.
2016-06-28 09:35:45 -07:00
Mark Wielaard
eab5028860 elf.h: Add NT_ARM_SYSTEM_CALL constant.
Linux kernel 3.18 added the NT_ARM_SYSTEM_CALL regset for aarch64.

	* elf/elf.h: Add NT_ARM_SYSTEM_CALL.
2016-02-19 20:48:22 +01:00
Mark Wielaard
7aa5adfbc3 elf/elf.h: Add new 386 and X86_64 relocations from binutils.
The following new 386 and X86_64 were added to binutils. They are
non-dynamic relocations, so don't need direct handling in glibc.
But other programs, like elfutils, use the glibc elf.h definitions
for the names and numbers when inspecting ET_REL files.

R_386_GOT32X was proposed in
https://groups.google.com/forum/#!topic/ia32-abi/GbJJskkid4I

X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX were proposed in
https://groups.google.com/forum/#!topic/x86-64-abi/n9AWHogmVY0

There also used to be R_X86_64_PC32_BND and R_X86_64_PLT32_BND
but those already got deprecated in
https://groups.google.com/d/msg/x86-64-abi/-hdQyMixt8Y/XFDOvioG85cJ

	* elf/elf.h (R_386_GOT32X): New.
	(R_386_NUM): Update.
	(R_X86_64_GOTPCRELX: New.
	(R_X86_64_REX_GOTPCRELX): New.
	(R_X86_64_NUM): Update.
2016-02-19 20:48:22 +01:00
Mark Wielaard
0f0f4db5b7 Revert "elf/elf.h: Add new 386 and X86_64 relocations from binutils."
This reverts commit 3da75f0881.

glibc 2.23 hard freeze doesn't allow this change at this time.
2016-01-31 18:34:27 +01:00
Mark Wielaard
3da75f0881 elf/elf.h: Add new 386 and X86_64 relocations from binutils.
The following new 386 and X86_64 were added to binutils. They are
non-dynamic relocations, so don't need direct handling in glibc.
But other programs, like elfutils, use the glibc elf.h definitions
for the names and numbers when inspecting ET_REL files.

R_386_GOT32X was proposed in
https://groups.google.com/forum/#!topic/ia32-abi/GbJJskkid4I

X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX were proposed in
https://groups.google.com/forum/#!topic/x86-64-abi/n9AWHogmVY0

There also used to be R_X86_64_PC32_BND and R_X86_64_PLT32_BND
but those already got deprecated in
https://groups.google.com/d/msg/x86-64-abi/-hdQyMixt8Y/XFDOvioG85cJ

	* elf/elf.h (R_386_GOT32X): New.
	(R_386_NUM): Update.
	(R_X86_64_GOTPCRELX: New.
	(R_X86_64_REX_GOTPCRELX): New.
	(R_X86_64_NUM): Update.
2016-01-31 11:44:32 +01:00
Joseph Myers
f7a9f785e5 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Matthew Fortune
a2057c984e Add support for DT_MIPS_RLD_MAP_REL.
This tag allows debugging of MIPS position independent executables
and provides access to shared library information.

	* elf/elf.h (DT_MIPS_RLD_MAP_REL): New macro.
	(DT_MIPS_NUM): Update.
	* sysdeps/mips/dl-machine.h (ELF_MACHINE_DEBUG_SETUP): Handle
	DT_MIPS_RLD_MAP_REL.
2015-06-26 12:03:45 +01:00
Mark Wielaard
b4336ba4f5 elf.h: Add section compression constants and structures.
Add SHF_COMPRESSED section flag, Elf32_Chdr and Elf64_Chdr structs and
ELFCOMPRESS constants to elf/elf.h.
2015-05-01 22:48:19 +02:00
Mark Wielaard
fb4041ae53 elf.h SHF_EXCLUDE signed int 31 bit shift triggers undefined behaviour.
Any use of SHF_EXCLUDE in code that tries to check it against sh_flags
will trigger undefined behaviour because it is defined as a 31 bit shift
against an signed integer. Fix by explicitly using an unsigned int.
2015-04-28 13:56:16 +02:00
Alan Modra
afcd9480fe powerpc __tls_get_addr call optimization
This patch is glibc support for a PowerPC TLS optimization, inspired
by Alexandre Oliva's TLS optimization for other processors,
http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt

In essence, this optimization uses a zero module id in the tls_index
GOT entry to indicate that a TLS variable is allocated space in the
static TLS area.  A special plt call linker stub for __tls_get_addr
checks for such a tls_index and if found, returns the offset
immediately.  The linker communicates the fact that the special
__tls_get_addr stub is used by setting a bit in the dynamic tag
DT_PPC64_OPT/DT_PPC_OPT.  glibc communicates to the linker that this
optimization is available by the presence of __tls_get_addr_opt.

tst-tlsmod2.so is built with -Wl,--no-tls-get-addr-optimize for
tst-tls-dlinfo, which otherwise would fail since it tests that no
static tls is allocated.  The ld option --no-tls-get-addr-optimize has
been available since binutils-2.20 so doesn't need a configure test.

	* NEWS: Advertise TLS optimization.
	* elf/elf.h (R_PPC_TLSGD, R_PPC_TLSLD, DT_PPC_OPT, PPC_OPT_TLS): Define.
	(DT_PPC_NUM): Increment.
	* elf/dynamic-link.h (HAVE_STATIC_TLS): Define.
	(CHECK_STATIC_TLS): Use here.
	* sysdeps/powerpc/powerpc32/dl-machine.h (elf_machine_rela): Optimize
	TLS descriptors.
	* sysdeps/powerpc/powerpc64/dl-machine.h (elf_machine_rela): Likewise.
	* sysdeps/powerpc/dl-tls.c: New file.
	* sysdeps/powerpc/Versions: Add __tls_get_addr_opt.
	* sysdeps/powerpc/tst-tlsopt-powerpc.c: New tls test.
	* sysdeps/unix/sysv/linux/powerpc/Makefile: Add new test.
	Build tst-tlsmod2.so with --no-tls-get-addr-optimize.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/ld.abilist: Update.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/ld.abilist: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/ld-le.abilist: Likewise.
2015-03-25 15:53:47 +10:30
Chung-Lin Tang
1a0a8d152d Add Nios II definitions to elf/elf.h. 2015-01-08 08:02:43 -08:00
Joseph Myers
b168057aaa Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
Matthew Fortune
0bd956720c Add support for MIPS O32 FPXX and .MIPS.abiflags
* elf/elf.h (PT_MIPS_ABIFLAGS): Define.
	(Elf_MIPS_ABIFlags_v0): New structure.
	(EF_MIPS_FP64): Define.
	(MIPS_AFL_REG_NONE, MIPS_AFL_REG_32, MIPS_AFL_REG_64): Likewise.
	(MIPS_AFL_REG_128, MIPS_AFL_ASE_DSP, MIPS_AFL_ASE_DSP64): Likewise.
	(MIPS_AFL_ASE_DSPR2, MIPS_AFL_ASE_EVA, MIPS_AFL_ASE_MCU): Likewise.
	(MIPS_AFL_ASE_MDMX, MIPS_AFL_ASE_MIPS3D, MIPS_AFL_ASE_MT): Likewise.
	(MIPS_AFL_ASE_SMARTMIPS, MIPS_AFL_ASE_VIRT): Likewise.
	(MIPS_AFL_ASE_VIRT64, MIPS_AFL_ASE_MSA, MIPS_AFL_ASE_MSA64): Likewise.
	(MIPS_AFL_ASE_MIPS16, MIPS_AFL_ASE_MICROMIPS): Likewise.
	(MIPS_AFL_ASE_XPA, MIPS_AFL_EXT_XLR, MIPS_AFL_EXT_OCTEON2): Likewise.
	(MIPS_AFL_EXT_OCTEONP, MIPS_AFL_EXT_LOONGSON_3A): Likewise.
	(MIPS_AFL_EXT_OCTEON, MIPS_AFL_EXT_5900, MIPS_AFL_EXT_4010): Likewise.
	(MIPS_AFL_EXT_4100, MIPS_AFL_EXT_3900, MIPS_AFL_EXT_10000): Likewise.
	(MIPS_AFL_EXT_SB1, MIPS_AFL_EXT_4111, MIPS_AFL_EXT_4120): Likewise.
	(MIPS_AFL_EXT_5400, MIPS_AFL_EXT_5500): Likewise.
	(MIPS_AFL_EXT_LOONGSON_2E, MIPS_AFL_EXT_LOONGSON_2F): Likewise.
	(Val_GNU_MIPS_ABI_FP_ANY, Val_GNU_MIPS_ABI_FP_DOUBLE): New enum values.
	(Val_GNU_MIPS_ABI_FP_SINGLE, Val_GNU_MIPS_ABI_FP_SOFT): Likewise.
	(Val_GNU_MIPS_ABI_FP_OLD_64, Val_GNU_MIPS_ABI_FP_XX): Likewise.
	(Val_GNU_MIPS_ABI_FP_64, Val_GNU_MIPS_ABI_FP_64A): Likewise.
	(Val_GNU_MIPS_ABI_FP_MAX): Likewise.
	* sysdeps/mips/Makefile [subdir=elf]: Add tst-abi-interlink,
	tst-mode-switch-1, tst-mode-switch-2, tst-mode-switch-3 tests.
	* sysdeps/mips/bits/linkmap.h (struct link_map_machine): Add fpmode
	field.
	* sysdeps/mips/dl-machine.h (elf_machine_matches_host): Reject
	EF_MIPS_FP64.
	* sysdeps/mips/dl-machine-reject-phdr.h: New file.
	* sysdeps/mips/tst-abi-fp32mod.c: Likewise.
	* sysdeps/mips/tst-abi-fpxxmod.c: Likewise.
	* sysdeps/mips/tst-abi-fpxxomod.c: Likewise.
	* sysdeps/mips/tst-abi-fp64mod.c: Likewise.
	* sysdeps/mips/tst-abi-fp64amod.c: Likewise.
	* sysdeps/mips/tst-abi-interlink.c: Likewise.
	* sysdeps/mips/tst-mode-switch-1.c: Likewise.
	* sysdeps/mips/tst-mode-switch-2.c: Likewise.
	* sysdeps/mips/tst-mode-switch-3.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/configure.ac (o32-fpabi): Define to
	record the current FP ABI extension.
	(mips-mode-switch): Define to show if kernel headers support mode
	switching.
	* sysdeps/unix/sysv/linux/mips/configure: Regenerate.
	* sysdeps/unix/sysv/linux/mips/ldsodefs.h: Increase maximum
	supported SYSV ABI version to 3.
	* sysdeps/unix/sysv/linux/mips/libc-abis: Add new MIPS_O32_FP64
	feature.
2014-12-31 21:09:21 +00:00
Will Newton
8c230039a0 AArch64: Update relocations for ILP32
The latest version of the binutils ELF header defines a new set of
dynamic relocations for ILP32 and renames some to make the naming
more uniform.

ChangeLog:

2014-11-21  Will Newton  <will.newton@linaro.org>
	    Andrew Pinski  <andrew.pinski@caviumnetworks.com>

	* elf/elf.h (R_AARCH64_P32_ABS32, R_AARCH64_P32_COPY,
	R_AARCH64_P32_GLOB_DAT, R_AARCH64_P32_JUMP_SLOT,
	R_AARCH64_P32_RELATIVE, R_AARCH64_P32_TLS_DTPMOD,
	R_AARCH64_P32_TLS_DTPREL, R_AARCH64_P32_TLS_TPREL,
	R_AARCH64_P32_TLSDESC, R_AARCH64_P32_IRELATIVE): Define.
	(R_AARCH64_TLS_DTPMOD64): Rename to ..
	(R_AARCH64_TLS_DTPMOD): This.
	(R_AARCH64_TLS_DTPREL64): Rename to ...
	(R_AARCH64_TLS_DTPREL): This.
	(R_AARCH64_TLS_TPREL64): Rename to ...
	(R_AARCH64_TLS_TPREL): This.
	* sysdeps/aarch64/dl-machine.h (elf_machine_type_class): Update
	R_AARCH64_TLS_DTPMOD64, R_AARCH64_TLS_DTPREL64, and
	R_AARCH64_TLS_TPREL64.
	(elf_machine_rela): Likewise.
2014-11-21 14:43:16 +00:00
Alan Modra
f6c44d4751 Correct DT_PPC64_NUM
[BZ #17153]
	* elf/elf.h (DT_PPC64_NUM): Correct value.
	* NEWS: Add to fixed bug list.
2014-07-14 21:17:32 +09:30
Allan McRae
d4697bc93d Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
Ulrich Weigand
122b66defd PowerPC64 ELFv2 ABI 3/6: PLT local entry point optimization
This is a follow-on to the previous patch to support the ELFv2 ABI in the
dynamic loader, split off into its own patch since it is just an optional
optimization.

In the ELFv2 ABI, most functions define both a global and a local entry
point; the local entry requires r2 to be already set up by the caller
to point to the callee's TOC; while the global entry does not require
the caller to know about the callee's TOC, but it needs to set up r12
to the callee's entry point address.

Now, when setting up a PLT slot, the dynamic linker will usually need
to enter the target function's global entry point.  However, if the
linker can prove that the target function is in the same DSO as the
PLT slot itself, and the whole DSO only uses a single TOC (which the
linker will let ld.so know via a DT_PPC64_OPT entry), then it is
possible to actually enter the local entry point address into the
PLT slot, for a slight improvement in performance.

Note that this uncovered a problem on the first call via _dl_runtime_resolve,
because that routine neglected to restore the caller's TOC before calling
the target function for the first time, since it assumed that function
would always reload its own TOC anyway ...
2013-12-04 07:41:38 -06:00
Ulrich Weigand
696caf1d00 PowerPC64 ELFv2 ABI 2/6: Remove function descriptors
This patch adds support for the ELFv2 ABI feature to remove function
descriptors.  See this GCC patch for in-depth discussion:
http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01141.html

This mostly involves two types of changes: updating assembler source
files to the new logic, and updating the dynamic loader.

After the refactoring in the previous patch, most of the assembler source
changes can be handled simply by providing ELFv2 versions of the
macros in sysdep.h.   One somewhat non-obvious change is in __GI__setjmp:
this used to "fall through" to the immediately following __setjmp ENTRY
point.  This is no longer safe in the ELFv2 since ENTRY defines both
a global and a local entry point, and you cannot simply fall through
to a global entry point as it requires r12 to be set up.

Also, makecontext needs to be updated to set up registers according to
the new ABI for calling into the context's start routine.

The dynamic linker changes mostly consist of removing special code
to handle function descriptors.  We also need to support the new PLT
and glink format used by the the ELFv2 linker, see:
https://sourceware.org/ml/binutils/2013-10/msg00376.html

In addition, the dynamic linker now verifies that the dynamic libraries
it loads match its own ABI.

The hack in VDSO_IFUNC_RET to "synthesize" a function descriptor
for vDSO routines is also no longer necessary for ELFv2.
2013-12-04 07:41:38 -06:00
Alan Modra
7ec07d9a7b PowerPC64: Report overflow on @h and @ha relocations
This patch updates glibc in accordance with the binutils patch checked in here:
https://sourceware.org/ml/binutils/2013-10/msg00372.html

This changes the various R_PPC64_..._HI and _HA relocations to report
32-bit overflows.  The motivation is that existing uses of @h / @ha
are to build up 32-bit offsets (for the "medium model" TOC access
that GCC now defaults to), and we'd really like to see failures at
link / load time rather than silent truncations.

For those rare cases where a modifier is needed to build up a 64-bit
constant, new relocations _HIGH / _HIGHA are supported.

The patch also fixes a bug in overflow checking for the R_PPC64_ADDR30
and R_PPC64_ADDR32 relocations.
2013-12-04 07:41:37 -06:00
Petr Machata
fd96752258 Add AArch64 relocation definitions. 2013-09-30 12:38:10 +01:00
Maciej W. Rozycki
9c21573c02 MIPS: IEEE 754-2008 NaN encoding support
It has been a long practice for software using IEEE 754 floating-point
arithmetic run on MIPS processors to use an encoding of Not-a-Number
(NaN) data different to one used by software run on other processors.
And as of IEEE 754-2008 revision [1] this encoding does not follow one
recommended in the standard, as specified in section 6.2.1, where it
is stated that quiet NaNs should have the first bit (d1) of their
significand set to 1 while signalling NaNs should have that bit set to
0, but MIPS software interprets the two bits in the opposite manner.

As from revision 3.50 [2][3] the MIPS Architecture provides for
processors that support the IEEE 754-2008 preferred NaN encoding format.
As the two formats (further referred to as "legacy NaN" and "2008 NaN")
are incompatible to each other, tools have to provide support for the
two formats to help people avoid using incompatible binary modules.

The change is comprised of two functional groups of features, both of
which are required for correct support.

1. Dynamic linker support.

   To enforce the NaN encoding requirement in dynamic linking a new ELF
   file header flag has been defined.  This flag is set for 2008-NaN
   shared modules and executables and clear for legacy-NaN ones.  The
   dynamic linker silently ignores any incompatible modules it
   encounters in dependency processing.

   To avoid unnecessary processing of incompatible modules in the
   presence of a shared module cache, a set of new cache flags has been
   defined to mark 2008-NaN modules for the three ABIs supported.
   Changes to sysdeps/unix/sysv/linux/mips/readelflib.c have been made
   following an earlier code quality suggestion made here:

   http://sourceware.org/ml/libc-ports/2009-03/msg00036.html

   and are therefore a little bit more extensive than the minimum
   required.

   Finally a new name has been defined for the dynamic linker so that
   2008-NaN and legacy-NaN binaries can coexist on a single system that
   supports dual-mode operation and that a legacy dynamic linker that
   does not support verifying the 2008-NaN ELF file header flag is not
   chosen to interpret a 2008-NaN binary by accident.

2. Floating environment support.

   IEEE 754-2008 features are controlled in the Floating-Point Control
   and Status (FCSR) register and updates are needed to floating
   environment support so that the 2008-NaN flag is set correctly and
   the kernel default, inferred from the 2008-NaN ELF file header flag
   at the time an executable is loaded, respected.

As the NaN encoding format is a property of GCC code generation that is
both a user-selected GCC configuration default and can be overridden
with GCC options, code that needs to know what NaN encoding standard it
has been configured for checks for the __mips_nan2008 macro that is
defined internally by GCC whenever the 2008-NaN mode has been selected.
This mode is determined at the glibc configuration time and therefore a
few consistency checks have been added to catch cases where compilation
flags have been overridden by the user.

The 2008 NaN set of features relies on kernel support as the in-kernel
floating-point emulator needs to be aware of the NaN encoding used even
on hard-float processors and configure the FPU context according to the
value of the 2008 NaN ELF file header flag of the executable being
started.  As at this time work on kernel support is still in progress
and the relevant changes have not made their way yet to linux.org master
repository.

Therefore the minimum version supported has been artificially set to
10.0.0 so that 2008-NaN code is not accidentally run on a Linux kernel
that does not suppport it.  It is anticipated that the version is
adjusted later on to the actual initial linux.org kernel version to
support this feature.  Legacy NaN encoding support is unaffected, older
kernel versions remain supported.

[1] "IEEE Standard for Floating-Point Arithmetic", IEEE Computer
    Society, IEEE Std 754-2008, 29 August 2008

[2] "MIPS Architecture For Programmers, Volume I-A: Introduction to the
    MIPS32 Architecture", MIPS Technologies, Inc., Document Number:
    MD00082, Revision 3.50, September 20, 2012

[3] "MIPS Architecture For Programmers, Volume I-A: Introduction to the
    MIPS64 Architecture", MIPS Technologies, Inc., Document Number:
    MD00083, Revision 3.50, September 20, 2012
2013-09-18 21:33:50 +01:00
Ondřej Bílka
6f65e66895 Fix typos. 2013-08-29 09:11:45 +02:00
Ryan S. Arnold
c18c701d03 Add AT_HWCAP2 as a new auxv_t a_type to elf.h. 2013-06-26 08:50:20 -05:00
David Holsgrove
9fbf9acabe Adding MicroBlaze support to elf/elf.h
Signed-off-by: David Holsgrove <david.holsgrove@xilinx.com>
2013-04-16 09:48:08 +10:00
Petr Machata
08cbd996d3 Add ARM relocation constants to elf/elf.h. 2013-02-20 16:19:04 +00:00
H.J. Lu
22676eafed Implement x86 SIZE32/SIZE64 relocations 2013-01-16 20:31:03 -08:00
Steve Ellcey
0e8529e94f 2013-01-11 Steve Ellcey <sellcey@mips.com>
* elf/elf.h (EF_MIPS_ARCH_32): Fix value.
	(EF_MIPS_ARCH_64): Fix value.
	(EF_MIPS_ARCH_32R2): New.
	(EF_MIPS_ARCH_64R2): New.
2013-01-11 11:20:05 -08:00
Roland McGrath
e7f68ef4bc Fix whitespace in elf.h MIPS macros. 2013-01-10 14:55:27 -08:00
Joseph Myers
568035b787 Update copyright notices with scripts/update-copyrights. 2013-01-02 19:05:09 +00:00
Andreas Jaeger
af5843efa0 Add values from Linux 3.7 to <elf.h> 2012-12-28 13:06:01 +01:00
H.J. Lu
7e1be74125 Check supported DF_1_XXX bits 2012-11-21 06:33:19 -08:00
Marcus Shawcroft
57241e26e5 Adjust comment above AArch64 relocs. 2012-11-08 08:19:30 +00:00
Marcus Shawcroft
19b2ecfcae Adding AArch64 support to elf/elf.h 2012-11-07 13:32:08 +00:00
Chris Metcalf
105ca950d9 elf.h: add new tilegx relocations (copy from binutils trunk) 2012-11-03 08:43:11 -04:00
Petr Machata
2abe9f1507 Synchronize with linux/elf.h.
Add new ARM and s390 note constants e.g. NT_*.
2012-09-06 12:41:14 -07:00
Steve McIntyre
d3bafbc98e Check floating-point ABI in ARM VALID_ELF_HEADER. 2012-08-23 20:38:25 +00:00
Mark Salter
33b4a91e5b Add new AM33 relocs 2012-08-08 21:43:47 -04:00
Andreas Krebbel
08f43f9bbf S/390: Add support for STT_GNU_IFUNC symbols.
Add support for STT_GNU_IFUNC symbols and the new R_390_IRELATIVE
relocation.  Provide optimized version of memcpy, memset, and memcmp
for z10 and z196.
2012-07-19 15:46:34 +02:00
H.J. Lu
df8a552f6f Handle R_X86_64_RELATIVE64 and R_X86_64_64 for x32 2012-05-10 17:05:06 -07:00
David S. Miller
5ed848f3d8 Handle some new sparc relocation types.
* elf/elf.h (R_SPARC_WDISP10): Define.
	* sysdeps/sparc/sparc32/dl-machine.h (elf_machine_rela): Handle
	R_SPARC_SIZE32.
	* sysdeps/sparc/sparc64/dl-machine.h (elf_machine_rela): Handle
	R_SPARC_SIZE64 and R_SPARC_H34.
2012-04-07 09:29:14 -07:00
Paul Eggert
59ba27a63a Replace FSF snail mail address with URLs. 2012-02-09 23:18:22 +00:00
Chris Metcalf
3ac8b282b6 Add Tile relocation types. 2012-01-30 09:54:13 -08:00
Roland McGrath
0a2349f929 Define ELFOSABI_GNU. 2011-09-09 10:11:49 -07:00