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authorUlrich Drepper <drepper@redhat.com>1997-09-27 00:21:42 +0000
committerUlrich Drepper <drepper@redhat.com>1997-09-27 00:21:42 +0000
commita2b08ee54130cf3a74655856e6ca6c29874a9df2 (patch)
tree71e7d867304f432bc57043e0c54a5cf101835651 /sysdeps/powerpc
parent650425ceb40e840b2123b6c8cc65389589f41218 (diff)
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1997-09-27 01:14 Ulrich Drepper <drepper@cygnus.com> * Makeconfig (extra-objs): Depend in before-compile. * configure.in: Locate Perl and substitute with complete path. * config.make.in: Add PERL for substitution. * elf/Makefile (routines): Add dl-addr. * elf/dladdr.c: Move the real code into ... * elf/dl-addr.c: New file. * elf/link.h: Add prototype for _dl_addr. * elf/dladdr.c (dladdr): Change address argument to be const. * elf/dlfcn.h: Likewise. * locale/C_name.c: Add _nl_POSIX_name. * locale/localeinfo.h: Add declaration of _nl_POSIX_name. * locale/findlocale.c (_nl_find_locale): Use _nl_POSIX_name. (_nl_remove_locale): Free name of data set. * locale/setlocale.c (clever_copy): Remove. (new_composite_name): Use _nl_C_name and _nl_POSIX_name in compare. (setname): Only remove old name when it is for category LC_ALL. Change malloc, free, realloc, and memalign hooks for glibc to take another parameter indicating the location of the caller. * malloc/malloc.c: Change hook functions and variables. * malloc/malloc.h: Likewise. * malloc/mcheck.c: Likewise. Make sure later hooked function also get the original caller address. * malloc/mtrace.c: Likewise. (tr_where): If no information in _mtrace_file is given use the information about the caller. * malloc/Makefile (distribute): Replace mtrace.awk by mtrace.pl. Add rules to install mtrace.pl after rewriting. * malloc/mtrace.pl: New file. Based on the old AWK script but with extended functionality. * malloc/mtrace.awk: Removed. * po/fr.po: New version. * string/Makefile: Do use builtins for tester.c and inl-tester.c. * string/tester.c: Rewrite. Split in many small functions to not exceed gcc's limits. * sysdeps/unix/sysv/linux/syscalls.list: Add prctl. 1997-09-25 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * string/bits/string2.h (__stpcpy_small): Don't use casts as lvalues. 1997-09-26 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/time.texi (Formatting Date and Time): Clarify explanation of strftime flags a bit. Suggested by Robert Bihlmeyer <robbe@orcus.priv.at>. 1997-09-25 00:13 David S. Miller <davem@tanya.rutgers.edu> * sysdeps/libm-ieee754/s_exp2f.c: Protect _GNU_SOURCE definition. Fix typo, it is FLT_MANT_DIG. 1997-09-24 18:52 H.J. Lu <hjl@gnu.ai.mit.edu> * math/atest-exp2.c: Include <stdlib/gmp.h> instead of <gmp.h>. 1997-08-27 08:10 H.J. Lu <hjl@gnu.ai.mit.edu> * libio/libio.h, libio/libioP.h: Support libio in libstdc++. * libio/libio.h (_IO_peekc): Defined as _IO_peekc_unlocked if _IO_MTSAFE_IO is undefined. 1997-09-24 23:27 Richard Henderson <rth@cygnus.com> * elf/dl-runtime.c (fixup): Don't go through elf_machine_relplt, but lookup the value of the target symbol ourselves and call the new elf_machine_fixup_plt. This kills the ELF_FIXUP_RETURN_VALUE hack. (profile_fixup): Likewise, but don't fix up the plt. * elf/rtld.c (_dl_main): ELF_MACHINE_RELOC_NOPLT renamed _JMP_SLOT. * sysdeps/alpha/dl-machine.h (ELF_MACHINE_RELOC_NOPLT): Renamed. (elf_alpha_fix_plt): Renamed elf_machine_fixup_plt. * sysdeps/i386/dl-machine.h (elf_machine_relplt): Killed. (ELF_MACHINE_JMP_SLOT): Renamed. (elf_machine_fixup_plt): New function. * sysdeps/m68k/dl-machine.h: Likewise. * sysdeps/powerpc/dl-machine.h: Likewise. (elf_machine_rela): Moved JMP_SLOT fixup out to elf_machine_fixup_plt. * sysdeps/sparc/sparc32/dl-machine.h: Likewise. * sysdeps/sparc/sparc64/dl-machine.h: Likewise. * sysdeps/stub/dl-machine.h: Update, sorta. * sysdeps/alpha/dl-machine.h (elf_machine_runtime_setup): Do profiling. (TRAMPOLINE_TEMPLATE): From the carcas of _RUNTIME_TRAMPOLINE, do both normal and profile code. (elf_machine_rela): Handle r_addend for .got and .plt too.
Diffstat (limited to 'sysdeps/powerpc')
-rw-r--r--sysdeps/powerpc/dl-machine.h134
1 files changed, 67 insertions, 67 deletions
diff --git a/sysdeps/powerpc/dl-machine.h b/sysdeps/powerpc/dl-machine.h
index 70a3f20..beabc1d 100644
--- a/sysdeps/powerpc/dl-machine.h
+++ b/sysdeps/powerpc/dl-machine.h
@@ -197,8 +197,7 @@ _dl_runtime_resolve:
# ...unwind the stack frame, and jump to the PLT entry we updated.
addi 1,1,48
bctr
-0:
- .size _dl_runtime_resolve,0b-_dl_runtime_resolve
+ .size _dl_runtime_resolve,.-_dl_runtime_resolve
.align 2
.globl _dl_prof_resolve
@@ -395,10 +394,6 @@ static ElfW(Addr) _dl_preferred_address = 1
_dl_preferred_address = mapstart; \
} )
-/* We require the address of the PLT entry returned from fixup, not
- the first word of the PLT entry. */
-#define ELF_FIXUP_RETURN_VALUE(map, result) ((Elf32_Addr) &(result))
-
/* Nonzero iff TYPE should not be allowed to resolve to one of
the main executable's symbols, as for a COPY reloc. */
#define elf_machine_lookup_noexec_p(type) ((type) == R_PPC_COPY)
@@ -413,7 +408,7 @@ static ElfW(Addr) _dl_preferred_address = 1
(type) == R_PPC_JMP_SLOT)
/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
-#define ELF_MACHINE_RELOC_NOPLT R_PPC_JMP_SLOT
+#define ELF_MACHINE_JMP_SLOT R_PPC_JMP_SLOT
/* Nonzero iff TYPE describes relocation of a PLT entry, so
PLT entries should not be allowed to define the value. */
@@ -554,6 +549,70 @@ elf_machine_lazy_rel (struct link_map *map, const Elf32_Rela *reloc)
/* elf_machine_runtime_setup handles this. */
}
+static inline void
+elf_machine_fixup_plt(struct link_map *map, const Elf32_Rela *reloc,
+ Elf32_Addr *reloc_addr, Elf32_Addr finaladdr)
+{
+ Elf32_Sword delta = finaladdr - (Elf32_Word) (char *) reloc_addr;
+ if (delta << 6 >> 6 == delta)
+ *reloc_addr = OPCODE_B (delta);
+ else if (finaladdr <= 0x01fffffc || finaladdr >= 0xfe000000)
+ *reloc_addr = OPCODE_BA (finaladdr);
+ else
+ {
+ Elf32_Word *plt;
+ Elf32_Word index;
+
+ plt = (Elf32_Word *)((char *)map->l_addr
+ + map->l_info[DT_PLTGOT]->d_un.d_val);
+ index = (reloc_addr - plt - PLT_INITIAL_ENTRY_WORDS)/2;
+ if (index >= PLT_DOUBLE_SIZE)
+ {
+ /* Slots greater than or equal to 2^13 have 4 words available
+ instead of two. */
+ /* FIXME: There are some possible race conditions in this code,
+ when called from 'fixup'.
+
+ 1) Suppose that a lazy PLT entry is executing, a context switch
+ between threads (or a signal) occurs, and the new thread or
+ signal handler calls the same lazy PLT entry. Then the PLT entry
+ would be changed while it's being run, which will cause a segfault
+ (almost always).
+
+ 2) Suppose the reverse: that a lazy PLT entry is being updated,
+ a context switch occurs, and the new code calls the lazy PLT
+ entry that is being updated. Then the half-fixed PLT entry will
+ be executed, which will also almost always cause a segfault.
+
+ These problems don't happen with the 2-word entries, because
+ only one of the two instructions are changed when a lazy entry
+ is retargeted at the actual PLT entry; the li instruction stays
+ the same (we have to update it anyway, because we might not be
+ updating a lazy PLT entry). */
+
+ reloc_addr[0] = OPCODE_LI (11, finaladdr);
+ reloc_addr[1] = OPCODE_ADDIS (11, 11, finaladdr + 0x8000 >> 16);
+ reloc_addr[2] = OPCODE_MTCTR (11);
+ reloc_addr[3] = OPCODE_BCTR ();
+ }
+ else
+ {
+ Elf32_Word num_plt_entries;
+
+ num_plt_entries = (map->l_info[DT_PLTRELSZ]->d_un.d_val
+ / sizeof(Elf32_Rela));
+
+ plt[index+PLT_DATA_START_WORDS (num_plt_entries)] = finaladdr;
+ reloc_addr[0] = OPCODE_LI (11, index*4);
+ reloc_addr[1] = OPCODE_B (-(4*(index*2
+ + 1
+ - PLT_LONGBRANCH_ENTRY_WORDS
+ + PLT_INITIAL_ENTRY_WORDS)));
+ }
+ }
+ MODIFIED_CODE (reloc_addr);
+}
+
#endif /* dl_machine_h */
#ifdef RESOLVE
@@ -674,66 +733,7 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
}
else if (rinfo == R_PPC_JMP_SLOT)
{
- Elf32_Sword delta = finaladdr - (Elf32_Word) (char *) reloc_addr;
- if (delta << 6 >> 6 == delta)
- *reloc_addr = OPCODE_B (delta);
- else if (finaladdr <= 0x01fffffc || finaladdr >= 0xfe000000)
- *reloc_addr = OPCODE_BA (finaladdr);
- else
- {
- Elf32_Word *plt;
- Elf32_Word index;
-
- plt = (Elf32_Word *)((char *)map->l_addr
- + map->l_info[DT_PLTGOT]->d_un.d_val);
- index = (reloc_addr - plt - PLT_INITIAL_ENTRY_WORDS)/2;
- if (index >= PLT_DOUBLE_SIZE)
- {
- /* Slots greater than or equal to 2^13 have 4 words available
- instead of two. */
- /* FIXME: There are some possible race conditions in this code,
- when called from 'fixup'.
-
- 1) Suppose that a lazy PLT entry is executing, a
- context switch between threads (or a signal) occurs,
- and the new thread or signal handler calls the same
- lazy PLT entry. Then the PLT entry would be changed
- while it's being run, which will cause a segfault
- (almost always).
-
- 2) Suppose the reverse: that a lazy PLT entry is
- being updated, a context switch occurs, and the new
- code calls the lazy PLT entry that is being updated.
- Then the half-fixed PLT entry will be executed, which
- will also almost always cause a segfault.
-
- These problems don't happen with the 2-word entries, because
- only one of the two instructions are changed when a lazy
- entry is retargeted at the actual PLT entry; the li
- instruction stays the same (we have to update it anyway,
- because we might not be updating a lazy PLT entry). */
- reloc_addr[0] = OPCODE_LI (11, finaladdr);
- reloc_addr[1] = OPCODE_ADDIS (11, 11, finaladdr + 0x8000 >> 16);
- reloc_addr[2] = OPCODE_MTCTR (11);
- reloc_addr[3] = OPCODE_BCTR ();
- }
- else
- {
- Elf32_Word num_plt_entries;
-
- num_plt_entries = (map->l_info[DT_PLTRELSZ]->d_un.d_val
- / sizeof(Elf32_Rela));
-
- plt[index+PLT_DATA_START_WORDS (num_plt_entries)] = finaladdr;
- reloc_addr[0] = OPCODE_LI (11, index*4);
- reloc_addr[1] =
- OPCODE_B (-(4*(index*2
- + 1
- - PLT_LONGBRANCH_ENTRY_WORDS
- + PLT_INITIAL_ENTRY_WORDS)));
- }
- }
- MODIFIED_CODE (reloc_addr);
+ elf_machine_fixup_plt (map, reloc, reloc_addr, finalvalue);
}
else
{