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848746e88e
glibc/sysdeps/x86_64/Makefile
H.J. Lu 848746e88e elf: Add ELF_DYNAMIC_AFTER_RELOC to rewrite PLT 
Add ELF_DYNAMIC_AFTER_RELOC to allow target specific processing after
relocation.

For x86-64, add

 #define DT_X86_64_PLT     (DT_LOPROC + 0)
 #define DT_X86_64_PLTSZ   (DT_LOPROC + 1)
 #define DT_X86_64_PLTENT  (DT_LOPROC + 3)

1. DT_X86_64_PLT: The address of the procedure linkage table.
2. DT_X86_64_PLTSZ: The total size, in bytes, of the procedure linkage
table.
3. DT_X86_64_PLTENT: The size, in bytes, of a procedure linkage table
entry.

With the r_addend field of the R_X86_64_JUMP_SLOT relocation set to the
memory offset of the indirect branch instruction.

Define ELF_DYNAMIC_AFTER_RELOC for x86-64 to rewrite the PLT section
with direct branch after relocation when the lazy binding is disabled.

PLT rewrite is disabled by default since SELinux may disallow modifying
code pages and ld.so can't detect it in all cases.  Use

$ export GLIBC_TUNABLES=glibc.cpu.plt_rewrite=1

to enable PLT rewrite with 32-bit direct jump at run-time or

$ export GLIBC_TUNABLES=glibc.cpu.plt_rewrite=2

to enable PLT rewrite with 32-bit direct jump and on APX processors with
64-bit absolute jump at run-time.

Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
2024-01-05 05:49:49 -08:00

238 lines
7.4 KiB
Makefile
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# The i387 `long double' is a distinct type we support.
long-double-fcts = yes
ifeq (yes,$(have-z-mark-plt))
# Always generate DT_X86_64_PLT* tags.
sysdep-LDFLAGS += -Wl,-z,mark-plt
# Never generate DT_X86_64_PLT* tags on ld.so to avoid changing its own
# PLT.
LDFLAGS-rtld += -Wl,-z,nomark-plt
endif
ifeq ($(subdir),csu)
gen-as-const-headers += link-defines.sym
endif
ifeq ($(subdir),gmon)
sysdep_routines += _mcount
# We cannot compile _mcount.S with -pg because that would create
# recursive calls when ENTRY is used. Just copy the normal static
# object.
sysdep_noprof += _mcount
endif
ifeq ($(subdir),string)
sysdep_routines += \
strcasecmp_l-nonascii \
strcspn-generic \
strncase_l-nonascii \
strpbrk-generic \
strspn-generic \
varshift \
# sysdep_routines
gen-as-const-headers += locale-defines.sym
tests += \
tst-rsi-strlen
endif
ifeq ($(subdir),elf)
# There is no good reason to use MMX in x86-64 ld.so with GCC.
CFLAGS-.os += $(if $(filter $(@F),$(patsubst %,%.os,$(all-rtld-routines))),\
-mno-mmx)
sysdep-dl-routines += tlsdesc dl-tlsdesc tls_get_addr
tests += ifuncmain8
modules-names += ifuncmod8
$(objpfx)ifuncmain8: $(objpfx)ifuncmod8.so
tests += tst-quad1 tst-quad2
modules-names += tst-quadmod1 tst-quadmod2
$(objpfx)tst-quad1: $(objpfx)tst-quadmod1.so
$(objpfx)tst-quad2: $(objpfx)tst-quadmod2.so
quad-pie-test += tst-quad1pie tst-quad2pie
tests += $(quad-pie-test)
tests-pie += $(quad-pie-test)
test-extras += tst-quadmod1pie tst-quadmod2pie
extra-test-objs += tst-quadmod1pie.o tst-quadmod2pie.o
$(objpfx)tst-quad1pie: $(objpfx)tst-quadmod1pie.o
$(objpfx)tst-quad2pie: $(objpfx)tst-quadmod2pie.o
CFLAGS-tst-quad1pie.c = $(PIE-ccflag)
CFLAGS-tst-quad2pie.c = $(PIE-ccflag)
tests += tst-platform-1
modules-names += tst-platformmod-1 x86_64/tst-platformmod-2
extra-test-objs += tst-platformmod-2.o
CFLAGS-tst-platform-1.c = -mno-avx
CFLAGS-tst-platformmod-1.c = -mno-avx
CFLAGS-tst-platformmod-2.c = -mno-avx
LDFLAGS-tst-platformmod-2.so = -Wl,-soname,tst-platformmod-2.so
$(objpfx)tst-platform-1: $(objpfx)tst-platformmod-1.so
$(objpfx)tst-platform-1.out: $(objpfx)x86_64/tst-platformmod-2.so
# Turn off AVX512F and AVX2 so that GLRO(dl_platform) is
# always set to x86_64.
tst-platform-1-ENV = LD_PRELOAD=$(objpfx)\$$PLATFORM/tst-platformmod-2.so \
GLIBC_TUNABLES=glibc.cpu.hwcaps=-AVX512F,-AVX2
tests += tst-audit3 tst-audit4 tst-audit5 tst-audit6 tst-audit7 \
tst-audit10 tst-sse tst-avx tst-avx512
test-extras += tst-audit4-aux tst-audit10-aux \
tst-avx-aux tst-avx512-aux
extra-test-objs += tst-audit4-aux.o tst-audit10-aux.o \
tst-avx-aux.o tst-avx512-aux.o
ifeq ($(have-insert),yes)
tests += tst-split-dynreloc
LDFLAGS-tst-split-dynreloc = -Wl,-T,$(..)sysdeps/x86_64/tst-split-dynreloc.lds
tst-split-dynreloc-ENV = LD_BIND_NOW=1
endif
modules-names += tst-auditmod3a tst-auditmod3b \
tst-auditmod4a tst-auditmod4b \
tst-auditmod5a tst-auditmod5b \
tst-auditmod6a tst-auditmod6b tst-auditmod6c \
tst-auditmod7a tst-auditmod7b \
tst-auditmod10a tst-auditmod10b \
tst-ssemod tst-avxmod tst-avx512mod
$(objpfx)tst-audit3: $(objpfx)tst-auditmod3a.so
$(objpfx)tst-audit3.out: $(objpfx)tst-auditmod3b.so
tst-audit3-ENV = LD_AUDIT=$(objpfx)tst-auditmod3b.so
$(objpfx)tst-audit4: $(objpfx)tst-audit4-aux.o $(objpfx)tst-auditmod4a.so
$(objpfx)tst-audit4.out: $(objpfx)tst-auditmod4b.so
tst-audit4-ENV = LD_AUDIT=$(objpfx)tst-auditmod4b.so
$(objpfx)tst-audit5: $(objpfx)tst-auditmod5a.so
$(objpfx)tst-audit5.out: $(objpfx)tst-auditmod5b.so
tst-audit5-ENV = LD_AUDIT=$(objpfx)tst-auditmod5b.so
$(objpfx)tst-audit6: $(objpfx)tst-auditmod6a.so
$(objpfx)tst-audit6.out: $(objpfx)tst-auditmod6b.so \
$(objpfx)tst-auditmod6c.so
tst-audit6-ENV = LD_AUDIT=$(objpfx)tst-auditmod6b.so:$(objpfx)tst-auditmod6c.so
$(objpfx)tst-audit7: $(objpfx)tst-auditmod7a.so
$(objpfx)tst-audit7.out: $(objpfx)tst-auditmod7b.so
tst-audit7-ENV = LD_AUDIT=$(objpfx)tst-auditmod7b.so
$(objpfx)tst-audit10: $(objpfx)tst-audit10-aux.o $(objpfx)tst-auditmod10a.so
$(objpfx)tst-audit10.out: $(objpfx)tst-auditmod10b.so
tst-audit10-ENV = LD_AUDIT=$(objpfx)tst-auditmod10b.so
$(objpfx)tst-sse: $(objpfx)tst-ssemod.so
$(objpfx)tst-avx: $(objpfx)tst-avx-aux.o $(objpfx)tst-avxmod.so
$(objpfx)tst-avx512: $(objpfx)tst-avx512-aux.o $(objpfx)tst-avx512mod.so
AVX-CFLAGS=-mavx -mno-vzeroupper
CFLAGS-tst-audit4-aux.c += $(AVX-CFLAGS)
CFLAGS-tst-auditmod4a.c += $(AVX-CFLAGS)
CFLAGS-tst-auditmod4b.c += $(AVX-CFLAGS)
CFLAGS-tst-auditmod6b.c += $(AVX-CFLAGS)
CFLAGS-tst-auditmod6c.c += $(AVX-CFLAGS)
CFLAGS-tst-auditmod7b.c += $(AVX-CFLAGS)
CFLAGS-tst-avx-aux.c += $(AVX-CFLAGS)
CFLAGS-tst-avxmod.c += $(AVX-CFLAGS)
AVX512-CFLAGS = -mavx512f
CFLAGS-tst-audit10-aux.c += $(AVX512-CFLAGS)
CFLAGS-tst-auditmod10a.c += $(AVX512-CFLAGS)
CFLAGS-tst-auditmod10b.c += $(AVX512-CFLAGS)
CFLAGS-tst-avx512-aux.c += $(AVX512-CFLAGS)
CFLAGS-tst-avx512mod.c += $(AVX512-CFLAGS)
$(objpfx)tst-glibc-hwcaps: $(objpfx)libmarkermod2-1.so \
$(objpfx)libmarkermod3-1.so $(objpfx)libmarkermod4-1.so
$(objpfx)tst-glibc-hwcaps.out: \
$(objpfx)libmarkermod2.so \
$(objpfx)glibc-hwcaps/x86-64-v2/libmarkermod2.so \
$(objpfx)libmarkermod3.so \
$(objpfx)glibc-hwcaps/x86-64-v2/libmarkermod3.so \
$(objpfx)glibc-hwcaps/x86-64-v3/libmarkermod3.so \
$(objpfx)libmarkermod4.so \
$(objpfx)glibc-hwcaps/x86-64-v2/libmarkermod4.so \
$(objpfx)glibc-hwcaps/x86-64-v3/libmarkermod4.so \
$(objpfx)glibc-hwcaps/x86-64-v4/libmarkermod4.so \
$(objpfx)glibc-hwcaps/x86-64-v2/libmarkermod2.so: $(objpfx)libmarkermod2-2.so
$(make-target-directory)
cp $< $@
$(objpfx)glibc-hwcaps/x86-64-v2/libmarkermod3.so: $(objpfx)libmarkermod3-2.so
$(make-target-directory)
cp $< $@
$(objpfx)glibc-hwcaps/x86-64-v3/libmarkermod3.so: $(objpfx)libmarkermod3-3.so
$(make-target-directory)
cp $< $@
$(objpfx)glibc-hwcaps/x86-64-v2/libmarkermod4.so: $(objpfx)libmarkermod4-2.so
$(make-target-directory)
cp $< $@
$(objpfx)glibc-hwcaps/x86-64-v3/libmarkermod4.so: $(objpfx)libmarkermod4-3.so
$(make-target-directory)
cp $< $@
$(objpfx)glibc-hwcaps/x86-64-v4/libmarkermod4.so: $(objpfx)libmarkermod4-4.so
$(make-target-directory)
cp $< $@
ifeq (no,$(build-hardcoded-path-in-tests))
# This is an ld.so.cache test, and RPATH/RUNPATH in the executable
# interferes with its test objectives.
tests-container += tst-glibc-hwcaps-cache
endif
ifeq (yes,$(have-z-mark-plt))
tests += \
tst-plt-rewrite1 \
# tests
modules-names += \
tst-plt-rewritemod1 \
# modules-names
tst-plt-rewrite1-no-pie = yes
LDFLAGS-tst-plt-rewrite1 = -Wl,-z,now
LDFLAGS-tst-plt-rewritemod1.so = -Wl,-z,now
tst-plt-rewrite1-ENV = GLIBC_TUNABLES=glibc.cpu.plt_rewrite=1 LD_DEBUG=files:bindings
$(objpfx)tst-plt-rewrite1: $(objpfx)tst-plt-rewritemod1.so
$(objpfx)tst-plt-rewrite1.out: /dev/null $(objpfx)tst-plt-rewrite1
$(tst-plt-rewrite1-ENV) $(make-test-out) > $@ 2>&1; \
grep -q -E "changing 'bar' PLT entry in .*/elf/tst-plt-rewritemod1.so' to direct branch" $@; \
$(evaluate-test)
endif
endif # $(subdir) == elf
ifeq ($(subdir),csu)
gen-as-const-headers += tlsdesc.sym rtld-offsets.sym
endif
ifeq ($(subdir),wcsmbs)
sysdep_routines += \
wcpcpy-generic \
wcpncpy-generic \
wcscat-generic \
wcscpy-generic \
wcsncat-generic \
wcsncmp-generic \
wcsncpy-generic \
wcsnlen-generic \
# sysdep_routines
tests += \
tst-rsi-wcslen
endif
do-tests-clean common-mostlyclean: tst-x86_64-1-clean
.PHONY: tst-x86_64-1-clean
tst-x86_64-1-clean:
-rm -rf $(objpfx)x86_64
$(objpfx)x86_64/tst-platformmod-2.os: $(objpfx)tst-platformmod-2.os
$(make-target-directory)
rm -f $@
ln $< $@
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