diff options
| -rw-r--r-- | ChangeLog | 16 | ||||
| -rw-r--r-- | elf/elf.h | 2 | ||||
| -rw-r--r-- | sysdeps/sparc/sparc32/dl-irel.h | 55 | ||||
| -rw-r--r-- | sysdeps/sparc/sparc32/dl-machine.h | 81 | ||||
| -rw-r--r-- | sysdeps/sparc/sparc32/dl-plt.h | 62 | ||||
| -rw-r--r-- | sysdeps/sparc/sparc64/dl-irel.h | 58 | ||||
| -rw-r--r-- | sysdeps/sparc/sparc64/dl-machine.h | 172 | ||||
| -rw-r--r-- | sysdeps/sparc/sparc64/dl-plt.h | 144 |
8 files changed, 402 insertions, 188 deletions
@@ -1,3 +1,19 @@ +2010-02-05 David S. Miller <davem@davemloft.net> + + * elf/elf.h (R_SPARC_JMP_IREL, R_SPARC_IRELATIVE): Define. + * sysdeps/sparc/sparc32/dl-machine.h (elf_machine_rela): Handle new + ifunc relocs. + (elf_machine_lazy_rel): Likewise. + (sparc_fixup_plt): Pull out to... + * sysdeps/sparc/sparc32/dl-plt.h: ...here. + * sysdeps/sparc/sparc32/dl-irel.h: New file. + * sysdeps/sparc/sparc64/dl-machine.h (elf_machine_rela): Handle new + ifunc relocs. + (elf_machine_lazy_rel): Likewise. + (sparc64_fixup_plt): Pull out to... + * sysdeps/sparc/sparc64/dl-plt.h: ...here. + * sysdeps/sparc/sparc64/dl-irel.h: New file. + 2010-02-09 Maxim Kuvyrkov <maxim@codesourcery.com> * elf/elf.h: Define m68k TLS relocations. @@ -1324,6 +1324,8 @@ typedef struct #define R_SPARC_H34 85 #define R_SPARC_SIZE32 86 #define R_SPARC_SIZE64 87 +#define R_SPARC_JMP_IREL 248 +#define R_SPARC_IRELATIVE 249 #define R_SPARC_GNU_VTINHERIT 250 #define R_SPARC_GNU_VTENTRY 251 #define R_SPARC_REV32 252 diff --git a/sysdeps/sparc/sparc32/dl-irel.h b/sysdeps/sparc/sparc32/dl-irel.h new file mode 100644 index 0000000..1891938 --- /dev/null +++ b/sysdeps/sparc/sparc32/dl-irel.h @@ -0,0 +1,55 @@ +/* Machine-dependent ELF indirect relocation inline functions. + SPARC 32-bit version. + Copyright (C) 2010 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifndef _DL_IREL_H +#define _DL_IREL_H + +#include <stdio.h> +#include <unistd.h> +#include <dl-plt.h> + +#define ELF_MACHINE_IRELA 1 + +static inline void +__attribute ((always_inline)) +elf_irela (const Elf32_Rela *reloc) +{ + unsigned int r_type = ELF32_R_TYPE (reloc->r_info); + + if (__builtin_expect (r_type == R_SPARC_IRELATIVE, 1)) + { + Elf32_Addr *const reloc_addr = (void *) reloc->r_offset; + Elf32_Addr value = ((Elf32_Addr (*) (void)) reloc->r_addend) (); + *reloc_addr = value; + } + else if (__builtin_expect (r_type == R_SPARC_JMP_IREL, 1)) + { + Elf32_Addr *const reloc_addr = (void *) reloc->r_offset; + Elf32_Addr value = ((Elf32_Addr (*) (void)) reloc->r_addend) (); + + sparc_fixup_plt (reloc, reloc_addr, value, 0, 1); + } + else if (r_type == R_SPARC_NONE) + ; + else + __libc_fatal ("unexpected reloc type in static binary"); +} + +#endif /* dl-irel.h */ diff --git a/sysdeps/sparc/sparc32/dl-machine.h b/sysdeps/sparc/sparc32/dl-machine.h index b3b7852..e1385f7 100644 --- a/sysdeps/sparc/sparc32/dl-machine.h +++ b/sysdeps/sparc/sparc32/dl-machine.h @@ -1,5 +1,5 @@ /* Machine-dependent ELF dynamic relocation inline functions. SPARC version. - Copyright (C) 1996-2003, 2004, 2005, 2006, 2007 + Copyright (C) 1996-2003, 2004, 2005, 2006, 2007, 2010 Free Software Foundation, Inc. This file is part of the GNU C Library. @@ -27,20 +27,13 @@ #include <sys/param.h> #include <ldsodefs.h> #include <tls.h> +#include <dl-plt.h> #ifndef VALIDX # define VALIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \ + DT_EXTRANUM + DT_VALTAGIDX (tag)) #endif -/* Some SPARC opcodes we need to use for self-modifying code. */ -#define OPCODE_NOP 0x01000000 /* nop */ -#define OPCODE_CALL 0x40000000 /* call ?; add PC-rel word address */ -#define OPCODE_SETHI_G1 0x03000000 /* sethi ?, %g1; add value>>10 */ -#define OPCODE_JMP_G1 0x81c06000 /* jmp %g1+?; add lo 10 bits of value */ -#define OPCODE_SAVE_SP 0x9de3bfa8 /* save %sp, -(16+6)*4, %sp */ -#define OPCODE_BA 0x30800000 /* b,a ?; add PC-rel word address */ - /* Return nonzero iff ELF header is compatible with the running host. */ static inline int elf_machine_matches_host (const Elf32_Ehdr *ehdr) @@ -312,41 +305,6 @@ _dl_start_user:\n\ .size _dl_start_user, . - _dl_start_user\n\ .previous"); -static inline __attribute__ ((always_inline)) Elf32_Addr -sparc_fixup_plt (const Elf32_Rela *reloc, Elf32_Addr *reloc_addr, - Elf32_Addr value, int t, int do_flush) -{ - Elf32_Sword disp = value - (Elf32_Addr) reloc_addr; - - if (0 && disp >= -0x800000 && disp < 0x800000) - { - /* Don't need to worry about thread safety. We're writing just one - instruction. */ - - reloc_addr[0] = OPCODE_BA | ((disp >> 2) & 0x3fffff); - if (do_flush) - __asm __volatile ("flush %0" : : "r"(reloc_addr)); - } - else - { - /* For thread safety, write the instructions from the bottom and - flush before we overwrite the critical "b,a". This of course - need not be done during bootstrapping, since there are no threads. - But we also can't tell if we _can_ use flush, so don't. */ - - reloc_addr += t; - reloc_addr[1] = OPCODE_JMP_G1 | (value & 0x3ff); - if (do_flush) - __asm __volatile ("flush %0+4" : : "r"(reloc_addr)); - - reloc_addr[0] = OPCODE_SETHI_G1 | (value >> 10); - if (do_flush) - __asm __volatile ("flush %0" : : "r"(reloc_addr)); - } - - return value; -} - static inline Elf32_Addr elf_machine_fixup_plt (struct link_map *map, lookup_t t, const Elf32_Rela *reloc, @@ -433,6 +391,13 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc, value += reloc->r_addend; /* Assume copy relocs have zero addend. */ + if (sym != NULL + && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0) + && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1)) + { + value = ((Elf32_Addr (*) (void)) value) (); + } + switch (r_type) { #if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP @@ -460,6 +425,13 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc, case R_SPARC_32: *reloc_addr = value; break; + case R_SPARC_IRELATIVE: + value = ((Elf32_Addr (*) (void)) value) (); + *reloc_addr = value; + break; + case R_SPARC_JMP_IREL: + value = ((Elf32_Addr (*) (void)) value) (); + /* Fall thru */ case R_SPARC_JMP_SLOT: { #if !defined RTLD_BOOTSTRAP && !defined __sparc_v9__ @@ -578,16 +550,21 @@ __attribute__ ((always_inline)) elf_machine_lazy_rel (struct link_map *map, Elf32_Addr l_addr, const Elf32_Rela *reloc) { - switch (ELF32_R_TYPE (reloc->r_info)) + Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); + const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); + + if (__builtin_expect (r_type == R_SPARC_JMP_SLOT, 1)) + ; + else if (r_type == R_SPARC_JMP_IREL) { - case R_SPARC_NONE: - break; - case R_SPARC_JMP_SLOT: - break; - default: - _dl_reloc_bad_type (map, ELFW(R_TYPE) (reloc->r_info), 1); - break; + Elf32_Addr value = map->l_addr + reloc->r_addend; + value = ((Elf32_Addr (*) (void)) value) (); + sparc_fixup_plt (reloc, reloc_addr, value, 0, 1); } + else if (r_type == R_SPARC_NONE) + ; + else + _dl_reloc_bad_type (map, r_type, 1); } #endif /* RESOLVE_MAP */ diff --git a/sysdeps/sparc/sparc32/dl-plt.h b/sysdeps/sparc/sparc32/dl-plt.h new file mode 100644 index 0000000..edcc5c1 --- /dev/null +++ b/sysdeps/sparc/sparc32/dl-plt.h @@ -0,0 +1,62 @@ +/* PLT fixups. Sparc 32-bit version. + Copyright (C) 1996-2003, 2004, 2005, 2006, 2007, 2010 + Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +/* Some SPARC opcodes we need to use for self-modifying code. */ +#define OPCODE_NOP 0x01000000 /* nop */ +#define OPCODE_CALL 0x40000000 /* call ?; add PC-rel word address */ +#define OPCODE_SETHI_G1 0x03000000 /* sethi ?, %g1; add value>>10 */ +#define OPCODE_JMP_G1 0x81c06000 /* jmp %g1+?; add lo 10 bits of value */ +#define OPCODE_SAVE_SP 0x9de3bfa8 /* save %sp, -(16+6)*4, %sp */ +#define OPCODE_BA 0x30800000 /* b,a ?; add PC-rel word address */ + +static inline __attribute__ ((always_inline)) Elf32_Addr +sparc_fixup_plt (const Elf32_Rela *reloc, Elf32_Addr *reloc_addr, + Elf32_Addr value, int t, int do_flush) +{ + Elf32_Sword disp = value - (Elf32_Addr) reloc_addr; + + if (0 && disp >= -0x800000 && disp < 0x800000) + { + /* Don't need to worry about thread safety. We're writing just one + instruction. */ + + reloc_addr[0] = OPCODE_BA | ((disp >> 2) & 0x3fffff); + if (do_flush) + __asm __volatile ("flush %0" : : "r"(reloc_addr)); + } + else + { + /* For thread safety, write the instructions from the bottom and + flush before we overwrite the critical "b,a". This of course + need not be done during bootstrapping, since there are no threads. + But we also can't tell if we _can_ use flush, so don't. */ + + reloc_addr += t; + reloc_addr[1] = OPCODE_JMP_G1 | (value & 0x3ff); + if (do_flush) + __asm __volatile ("flush %0+4" : : "r"(reloc_addr)); + + reloc_addr[0] = OPCODE_SETHI_G1 | (value >> 10); + if (do_flush) + __asm __volatile ("flush %0" : : "r"(reloc_addr)); + } + + return value; +} diff --git a/sysdeps/sparc/sparc64/dl-irel.h b/sysdeps/sparc/sparc64/dl-irel.h new file mode 100644 index 0000000..1a2a0a3 --- /dev/null +++ b/sysdeps/sparc/sparc64/dl-irel.h @@ -0,0 +1,58 @@ +/* Machine-dependent ELF indirect relocation inline functions. + SPARC 64-bit version. + Copyright (C) 2010 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifndef _DL_IREL_H +#define _DL_IREL_H + +#include <stdio.h> +#include <unistd.h> +#include <dl-plt.h> + +#define ELF_MACHINE_IRELA 1 + +static inline void +__attribute ((always_inline)) +elf_irela (const Elf64_Rela *reloc) +{ + unsigned int r_type = (reloc->r_info & 0xff); + + if (__builtin_expect (r_type == R_SPARC_IRELATIVE, 1)) + { + Elf64_Addr *const reloc_addr = (void *) reloc->r_offset; + Elf64_Addr value = ((Elf64_Addr (*) (void)) reloc->r_addend) (); + *reloc_addr = value; + } + else if (__builtin_expect (r_type == R_SPARC_JMP_IREL, 1)) + { + Elf64_Addr *const reloc_addr = (void *) reloc->r_offset; + Elf64_Addr value = ((Elf64_Addr (*) (void)) reloc->r_addend) (); + struct link_map map = { .l_addr = 0 }; + + /* 'high' is always zero, for large PLT entries the linker + emits an R_SPARC_IRELATIVE. */ + sparc64_fixup_plt (&map, reloc, reloc_addr, value, 0, 0); + } + else if (r_type == R_SPARC_NONE) + ; + else + __libc_fatal ("unexpected reloc type in static binary"); +} + +#endif /* dl-irel.h */ diff --git a/sysdeps/sparc/sparc64/dl-machine.h b/sysdeps/sparc/sparc64/dl-machine.h index 3eee672..b4f43e9 100644 --- a/sysdeps/sparc/sparc64/dl-machine.h +++ b/sysdeps/sparc/sparc64/dl-machine.h @@ -1,6 +1,6 @@ /* Machine-dependent ELF dynamic relocation inline functions. Sparc64 version. - Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 - Free Software Foundation, Inc. + Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, + 2010 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -27,6 +27,7 @@ #include <sys/param.h> #include <ldsodefs.h> #include <sysdep.h> +#include <dl-plt.h> #ifndef VALIDX # define VALIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \ @@ -89,132 +90,6 @@ elf_machine_load_address (void) return (Elf64_Addr) got - *got + (Elf32_Sword) ((pc[2] - pc[3]) * 4) - 4; } -/* We have 4 cases to handle. And we code different code sequences - for each one. I love V9 code models... */ -static inline void __attribute__ ((always_inline)) -sparc64_fixup_plt (struct link_map *map, const Elf64_Rela *reloc, - Elf64_Addr *reloc_addr, Elf64_Addr value, - Elf64_Addr high, int t) -{ - unsigned int *insns = (unsigned int *) reloc_addr; - Elf64_Addr plt_vaddr = (Elf64_Addr) reloc_addr; - Elf64_Sxword disp = value - plt_vaddr; - - /* Now move plt_vaddr up to the call instruction. */ - plt_vaddr += ((t + 1) * 4); - - /* PLT entries .PLT32768 and above look always the same. */ - if (__builtin_expect (high, 0) != 0) - { - *reloc_addr = value - map->l_addr; - } - /* Near destination. */ - else if (disp >= -0x800000 && disp < 0x800000) - { - /* As this is just one instruction, it is thread safe and so - we can avoid the unnecessary sethi FOO, %g1. - b,a target */ - insns[0] = 0x30800000 | ((disp >> 2) & 0x3fffff); - __asm __volatile ("flush %0" : : "r" (insns)); - } - /* 32-bit Sparc style, the target is in the lower 32-bits of - address space. */ - else if (insns += t, (value >> 32) == 0) - { - /* sethi %hi(target), %g1 - jmpl %g1 + %lo(target), %g0 */ - - insns[1] = 0x81c06000 | (value & 0x3ff); - __asm __volatile ("flush %0 + 4" : : "r" (insns)); - - insns[0] = 0x03000000 | ((unsigned int)(value >> 10)); - __asm __volatile ("flush %0" : : "r" (insns)); - } - /* We can also get somewhat simple sequences if the distance between - the target and the PLT entry is within +/- 2GB. */ - else if ((plt_vaddr > value - && ((plt_vaddr - value) >> 31) == 0) - || (value > plt_vaddr - && ((value - plt_vaddr) >> 31) == 0)) - { - unsigned int displacement; - - if (plt_vaddr > value) - displacement = (0 - (plt_vaddr - value)); - else - displacement = value - plt_vaddr; - - /* mov %o7, %g1 - call displacement - mov %g1, %o7 */ - - insns[2] = 0x9e100001; - __asm __volatile ("flush %0 + 8" : : "r" (insns)); - - insns[1] = 0x40000000 | (displacement >> 2); - __asm __volatile ("flush %0 + 4" : : "r" (insns)); - - insns[0] = 0x8210000f; - __asm __volatile ("flush %0" : : "r" (insns)); - } - /* Worst case, ho hum... */ - else - { - unsigned int high32 = (value >> 32); - unsigned int low32 = (unsigned int) value; - - /* ??? Some tricks can be stolen from the sparc64 egcs backend - constant formation code I wrote. -DaveM */ - - if (__builtin_expect (high32 & 0x3ff, 0)) - { - /* sethi %hh(value), %g1 - sethi %lm(value), %g5 - or %g1, %hm(value), %g1 - or %g5, %lo(value), %g5 - sllx %g1, 32, %g1 - jmpl %g1 + %g5, %g0 - nop */ - - insns[5] = 0x81c04005; - __asm __volatile ("flush %0 + 20" : : "r" (insns)); - - insns[4] = 0x83287020; - __asm __volatile ("flush %0 + 16" : : "r" (insns)); - - insns[3] = 0x8a116000 | (low32 & 0x3ff); - __asm __volatile ("flush %0 + 12" : : "r" (insns)); - - insns[2] = 0x82106000 | (high32 & 0x3ff); - } - else - { - /* sethi %hh(value), %g1 - sethi %lm(value), %g5 - sllx %g1, 32, %g1 - or %g5, %lo(value), %g5 - jmpl %g1 + %g5, %g0 - nop */ - - insns[4] = 0x81c04005; - __asm __volatile ("flush %0 + 16" : : "r" (insns)); - - insns[3] = 0x8a116000 | (low32 & 0x3ff); - __asm __volatile ("flush %0 + 12" : : "r" (insns)); - - insns[2] = 0x83287020; - } - - __asm __volatile ("flush %0 + 8" : : "r" (insns)); - - insns[1] = 0x0b000000 | (low32 >> 10); - __asm __volatile ("flush %0 + 4" : : "r" (insns)); - - insns[0] = 0x03000000 | (high32 >> 10); - __asm __volatile ("flush %0" : : "r" (insns)); - } -} - static inline Elf64_Addr __attribute__ ((always_inline)) elf_machine_fixup_plt (struct link_map *map, lookup_t t, const Elf64_Rela *reloc, @@ -549,6 +424,11 @@ elf_machine_rela (struct link_map *map, const Elf64_Rela *reloc, value += reloc->r_addend; /* Assume copy relocs have zero addend. */ + if (sym != NULL + && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0) + && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1)) + value = ((Elf64_Addr (*) (void)) value) (); + switch (r_type) { #if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP @@ -576,6 +456,13 @@ elf_machine_rela (struct link_map *map, const Elf64_Rela *reloc, case R_SPARC_GLOB_DAT: *reloc_addr = value; break; + case R_SPARC_IRELATIVE: + value = ((Elf64_Addr (*) (void)) value) (); + *reloc_addr = value; + break; + case R_SPARC_JMP_IREL: + value = ((Elf64_Addr (*) (void)) value) (); + /* Fall thru */ case R_SPARC_JMP_SLOT: #ifdef RESOLVE_CONFLICT_FIND_MAP /* R_SPARC_JMP_SLOT conflicts against .plt[32768+] @@ -757,16 +644,29 @@ __attribute__ ((always_inline)) elf_machine_lazy_rel (struct link_map *map, Elf64_Addr l_addr, const Elf64_Rela *reloc) { - switch (ELF64_R_TYPE (reloc->r_info)) + Elf64_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); + const unsigned int r_type = ELF64_R_TYPE (reloc->r_info); + + if (__builtin_expect (r_type == R_SPARC_JMP_SLOT, 1)) + ; + else if (r_type == R_SPARC_JMP_IREL + || r_type == R_SPARC_IRELATIVE) { - case R_SPARC_NONE: - break; - case R_SPARC_JMP_SLOT: - break; - default: - _dl_reloc_bad_type (map, ELFW(R_TYPE) (reloc->r_info), 1); - break; + Elf64_Addr value = map->l_addr + reloc->r_addend; + value = ((Elf64_Addr (*) (void)) value) (); + if (r_type == R_SPARC_JMP_IREL) + { + /* 'high' is always zero, for large PLT entries the linker + emits an R_SPARC_IRELATIVE. */ + sparc64_fixup_plt (map, reloc, reloc_addr, value, 0, 0); + } + else + *reloc_addr = value; } + else if (r_type == R_SPARC_NONE) + ; + else + _dl_reloc_bad_type (map, r_type, 1); } #endif /* RESOLVE_MAP */ diff --git a/sysdeps/sparc/sparc64/dl-plt.h b/sysdeps/sparc/sparc64/dl-plt.h new file mode 100644 index 0000000..e06be43 --- /dev/null +++ b/sysdeps/sparc/sparc64/dl-plt.h @@ -0,0 +1,144 @@ +/* PLT fixups. Sparc 64-bit version. + Copyright (C) 1997-2006, 2010 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +/* We have 4 cases to handle. And we code different code sequences + for each one. I love V9 code models... */ +static inline void __attribute__ ((always_inline)) +sparc64_fixup_plt (struct link_map *map, const Elf64_Rela *reloc, + Elf64_Addr *reloc_addr, Elf64_Addr value, + Elf64_Addr high, int t) +{ + unsigned int *insns = (unsigned int *) reloc_addr; + Elf64_Addr plt_vaddr = (Elf64_Addr) reloc_addr; + Elf64_Sxword disp = value - plt_vaddr; + + /* Now move plt_vaddr up to the call instruction. */ + plt_vaddr += ((t + 1) * 4); + + /* PLT entries .PLT32768 and above look always the same. */ + if (__builtin_expect (high, 0) != 0) + { + *reloc_addr = value - map->l_addr; + } + /* Near destination. */ + else if (disp >= -0x800000 && disp < 0x800000) + { + /* As this is just one instruction, it is thread safe and so + we can avoid the unnecessary sethi FOO, %g1. + b,a target */ + insns[0] = 0x30800000 | ((disp >> 2) & 0x3fffff); + __asm __volatile ("flush %0" : : "r" (insns)); + } + /* 32-bit Sparc style, the target is in the lower 32-bits of + address space. */ + else if (insns += t, (value >> 32) == 0) + { + /* sethi %hi(target), %g1 + jmpl %g1 + %lo(target), %g0 */ + + insns[1] = 0x81c06000 | (value & 0x3ff); + __asm __volatile ("flush %0 + 4" : : "r" (insns)); + + insns[0] = 0x03000000 | ((unsigned int)(value >> 10)); + __asm __volatile ("flush %0" : : "r" (insns)); + } + /* We can also get somewhat simple sequences if the distance between + the target and the PLT entry is within +/- 2GB. */ + else if ((plt_vaddr > value + && ((plt_vaddr - value) >> 31) == 0) + || (value > plt_vaddr + && ((value - plt_vaddr) >> 31) == 0)) + { + unsigned int displacement; + + if (plt_vaddr > value) + displacement = (0 - (plt_vaddr - value)); + else + displacement = value - plt_vaddr; + + /* mov %o7, %g1 + call displacement + mov %g1, %o7 */ + + insns[2] = 0x9e100001; + __asm __volatile ("flush %0 + 8" : : "r" (insns)); + + insns[1] = 0x40000000 | (displacement >> 2); + __asm __volatile ("flush %0 + 4" : : "r" (insns)); + + insns[0] = 0x8210000f; + __asm __volatile ("flush %0" : : "r" (insns)); + } + /* Worst case, ho hum... */ + else + { + unsigned int high32 = (value >> 32); + unsigned int low32 = (unsigned int) value; + + /* ??? Some tricks can be stolen from the sparc64 egcs backend + constant formation code I wrote. -DaveM */ + + if (__builtin_expect (high32 & 0x3ff, 0)) + { + /* sethi %hh(value), %g1 + sethi %lm(value), %g5 + or %g1, %hm(value), %g1 + or %g5, %lo(value), %g5 + sllx %g1, 32, %g1 + jmpl %g1 + %g5, %g0 + nop */ + + insns[5] = 0x81c04005; + __asm __volatile ("flush %0 + 20" : : "r" (insns)); + + insns[4] = 0x83287020; + __asm __volatile ("flush %0 + 16" : : "r" (insns)); + + insns[3] = 0x8a116000 | (low32 & 0x3ff); + __asm __volatile ("flush %0 + 12" : : "r" (insns)); + + insns[2] = 0x82106000 | (high32 & 0x3ff); + } + else + { + /* sethi %hh(value), %g1 + sethi %lm(value), %g5 + sllx %g1, 32, %g1 + or %g5, %lo(value), %g5 + jmpl %g1 + %g5, %g0 + nop */ + + insns[4] = 0x81c04005; + __asm __volatile ("flush %0 + 16" : : "r" (insns)); + + insns[3] = 0x8a116000 | (low32 & 0x3ff); + __asm __volatile ("flush %0 + 12" : : "r" (insns)); + + insns[2] = 0x83287020; + } + + __asm __volatile ("flush %0 + 8" : : "r" (insns)); + + insns[1] = 0x0b000000 | (low32 >> 10); + __asm __volatile ("flush %0 + 4" : : "r" (insns)); + + insns[0] = 0x03000000 | (high32 >> 10); + __asm __volatile ("flush %0" : : "r" (insns)); + } +} |