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Diffstat (limited to 'sysdeps/hppa/dl-machine.h')
| -rw-r--r-- | sysdeps/hppa/dl-machine.h | 762 |
1 files changed, 762 insertions, 0 deletions
diff --git a/sysdeps/hppa/dl-machine.h b/sysdeps/hppa/dl-machine.h new file mode 100644 index 0000000000..d29501d306 --- /dev/null +++ b/sysdeps/hppa/dl-machine.h @@ -0,0 +1,762 @@ +/* Machine-dependent ELF dynamic relocation inline functions. PA-RISC version. + Copyright (C) 1995-1997,1999-2003 + Free Software Foundation, Inc. + Contributed by David Huggins-Daines <dhd@debian.org> + 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_machine_h +#define dl_machine_h 1 + +#define ELF_MACHINE_NAME "hppa" + +#include <sys/param.h> +#include <assert.h> +#include <string.h> +#include <link.h> +#include <errno.h> +#include <dl-fptr.h> +#include <abort-instr.h> + +# define VALID_ELF_OSABI(osabi) ((osabi == ELFOSABI_SYSV) || (osabi == ELFOSABI_LINUX)) +# define VALID_ELF_ABIVERSION(ver) (ver == 0) +# define VALID_ELF_HEADER(hdr,exp,size) \ + memcmp (hdr,exp,size-2) == 0 \ + && VALID_ELF_OSABI (hdr[EI_OSABI]) \ + && VALID_ELF_ABIVERSION (hdr[EI_ABIVERSION]) + +/* These two definitions must match the definition of the stub in + bfd/elf32-hppa.c (see plt_stub[]). + + a. Define the size of the *entire* stub we place at the end of the PLT + table (right up against the GOT). + + b. Define the number of bytes back from the GOT to the entry point of + the PLT stub. You see the PLT stub must be entered in the middle + so it can depwi to find it's own address (long jump stub) + + c. Define the size of a single PLT entry so we can jump over the + last entry to get the stub address */ + +#define SIZEOF_PLT_STUB (7*4) +#define GOT_FROM_PLT_STUB (4*4) +#define PLT_ENTRY_SIZE (2*4) + +/* Initialize the function descriptor table before relocations */ +static inline void +__hppa_init_bootstrap_fdesc_table (struct link_map *map) +{ + ElfW(Addr) *boot_table; + + /* Careful: this will be called before got has been relocated... */ + ELF_MACHINE_LOAD_ADDRESS(boot_table,_dl_boot_fptr_table); + + map->l_mach.fptr_table_len = ELF_MACHINE_BOOT_FPTR_TABLE_LEN; + map->l_mach.fptr_table = boot_table; +} + +#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) \ + __hppa_init_bootstrap_fdesc_table (&bootstrap_map); + +/* Return nonzero iff ELF header is compatible with the running host. */ +static inline int +elf_machine_matches_host (const Elf32_Ehdr *ehdr) +{ + return ehdr->e_machine == EM_PARISC; +} + +/* Return the link-time address of _DYNAMIC. */ +static inline Elf32_Addr +elf_machine_dynamic (void) __attribute__ ((const)); + +static inline Elf32_Addr +elf_machine_dynamic (void) +{ + Elf32_Addr dynamic; + + asm ("b,l 1f,%0\n" +" depi 0,31,2,%0\n" +"1: addil L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 8),%0\n" +" ldw R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 12)(%%r1),%0\n" + : "=r" (dynamic) : : "r1"); + + return dynamic; +} + +/* Return the run-time load address of the shared object. */ +static inline Elf32_Addr +elf_machine_load_address (void) __attribute__ ((const)); + +static inline Elf32_Addr +elf_machine_load_address (void) +{ + Elf32_Addr dynamic; + + asm ( +" b,l 1f,%0\n" +" depi 0,31,2,%0\n" +"1: addil L'_DYNAMIC - ($PIC_pcrel$0 - 8),%0\n" +" ldo R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%%r1),%0\n" + : "=r" (dynamic) : : "r1"); + + return dynamic - elf_machine_dynamic (); +} + +/* Fixup a PLT entry to bounce directly to the function at VALUE. + Optimized non-profile version. */ +static inline Elf32_Addr +elf_machine_fixup_plt (struct link_map *map, lookup_t t, + const Elf32_Rela *reloc, + Elf32_Addr *reloc_addr, Elf32_Addr value) +{ + /* map is the link_map for the caller, t is the link_map for the object + being called */ + reloc_addr[1] = D_PTR (t, l_info[DT_PLTGOT]); + reloc_addr[0] = value; + /* Return the PLT slot rather than the function value so that the + trampoline can load the new LTP. */ + return (Elf32_Addr) reloc_addr; +} + +/* Fixup a PLT entry to bounce directly to the function at VALUE. */ +#define ELF_MACHINE_PROFILE_FIXUP_PLT elf_machine_profile_fixup_plt +static inline Elf32_Addr +elf_machine_profile_fixup_plt (struct link_map *map, lookup_t t, + const Elf32_Rela *reloc, + Elf32_Addr *reloc_addr, Elf32_Addr value) +{ + if(__builtin_expect (t == NULL, 1)) + return (Elf32_Addr) reloc_addr; + /* Return the PLT slot rather than the function value so that the + trampoline can load the new LTP. */ + return (Elf32_Addr) elf_machine_fixup_plt(map, t, reloc, reloc_addr, value); +} + +/* Return the final value of a plt relocation. */ +static inline Elf32_Addr +elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc, + Elf32_Addr value) +{ + /* We are rela only */ + return value + reloc->r_addend; +} + +/* Set up the loaded object described by L so its unrelocated PLT + entries will jump to the on-demand fixup code in dl-runtime.c. */ + +static inline int +elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) +{ + Elf32_Addr *got = NULL; + Elf32_Addr l_addr, iplt, jmprel, end_jmprel, r_type, r_sym; + const Elf32_Rela *reloc; + struct fdesc *fptr; + static union { + unsigned char c[8]; + Elf32_Addr i[2]; + } sig = {{0x00,0xc0,0xff,0xee, 0xde,0xad,0xbe,0xef}}; + + /* If we don't have a PLT we can just skip all this... */ + if (__builtin_expect (l->l_info[DT_JMPREL] == NULL,0)) + return lazy; + + /* All paths use these values */ + l_addr = l->l_addr; + jmprel = D_PTR(l, l_info[DT_JMPREL]); + end_jmprel = jmprel + l->l_info[DT_PLTRELSZ]->d_un.d_val; + + extern void _dl_runtime_resolve (void); + extern void _dl_runtime_profile (void); + + /* Linking lazily */ + if (lazy) + { + /* FIXME: Search for the got, but backwards through the relocs, technically we should + find it on the first try. However, assuming the relocs got out of order the + routine is made a bit more robust by searching them all in case of failure. */ + for (iplt = (end_jmprel - sizeof(Elf32_Rela)); iplt >= jmprel; iplt -= sizeof (Elf32_Rela)) + { + + reloc = (const Elf32_Rela *) iplt; + r_type = ELF32_R_TYPE (reloc->r_info); + r_sym = ELF32_R_SYM (reloc->r_info); + + got = (Elf32_Addr *) (reloc->r_offset + l_addr + PLT_ENTRY_SIZE + SIZEOF_PLT_STUB); + + /* If we aren't an IPLT, and we aren't NONE then it's a bad reloc */ + if (__builtin_expect (r_type != R_PARISC_IPLT, 0)) + { + if (__builtin_expect (r_type != R_PARISC_NONE, 0)) + _dl_reloc_bad_type (l, r_type, 1); + continue; + } + + /* Check for the plt_stub that binutils placed here for us + to use with _dl_runtime_resolve */ + if (got[-2] != sig.i[0] || got[-1] != sig.i[1]) + { + got = NULL; /* Not the stub... keep looking */ + } + else + { + /* Found the GOT! */ + register Elf32_Addr ltp __asm__ ("%r19"); + /* Identify this shared object. */ + got[1] = (Elf32_Addr) l; + + /* This function will be called to perform the relocation. */ + if (__builtin_expect (!profile, 1)) + { + /* If a static application called us, then _dl_runtime_resolve is not + a function descriptor, but the *real* address of the function... */ + if((unsigned long) &_dl_runtime_resolve & 3) + { + got[-2] = (Elf32_Addr) ((struct fdesc *) + ((unsigned long) &_dl_runtime_resolve & ~3))->ip; + } + else + { + /* Static executable! */ + got[-2] = (Elf32_Addr) &_dl_runtime_resolve; + } + } + else + { + if (_dl_name_match_p (GLRO(dl_profile), l)) + { + /* This is the object we are looking for. Say that + we really want profiling and the timers are + started. */ + GL(dl_profile_map) = l; + } + + if((unsigned long) &_dl_runtime_resolve & 3) + { + got[-2] = (Elf32_Addr) ((struct fdesc *) + ((unsigned long) &_dl_runtime_profile & ~3))->ip; + } + else + { + /* Static executable */ + got[-2] = (Elf32_Addr) &_dl_runtime_profile; + } + } + /* Plunk in the gp of this function descriptor so we + can make the call to _dl_runtime_xxxxxx */ + got[-1] = ltp; + break; + /* Done looking for the GOT, and stub is setup */ + } /* else we found the GOT */ + } /* for, walk the relocs backwards */ + + if(!got) + return 0; /* No lazy linking for you! */ + + /* Process all the relocs, now that we know the GOT... */ + for (iplt = jmprel; iplt < end_jmprel; iplt += sizeof (Elf32_Rela)) + { + reloc = (const Elf32_Rela *) iplt; + r_type = ELF32_R_TYPE (reloc->r_info); + r_sym = ELF32_R_SYM (reloc->r_info); + + if (__builtin_expect (r_type == R_PARISC_IPLT, 1)) + { + fptr = (struct fdesc *) (reloc->r_offset + l_addr); + if (r_sym != 0) + { + /* Relocate the pointer to the stub. */ + fptr->ip = (Elf32_Addr) got - GOT_FROM_PLT_STUB; + + /* Instead of the LTP value, we put the reloc offset + here. The trampoline code will load the proper + LTP and pass the reloc offset to the fixup + function. */ + fptr->gp = iplt - jmprel; + } /* r_sym != 0 */ + else + { + /* Relocate this *ABS* entry. */ + fptr->ip = reloc->r_addend + l_addr; + fptr->gp = D_PTR (l, l_info[DT_PLTGOT]); + } + } /* r_type == R_PARISC_IPLT */ + } /* for all the relocations */ + } /* if lazy */ + else + { + for (iplt = jmprel; iplt < end_jmprel; iplt += sizeof (Elf32_Rela)) + { + reloc = (const Elf32_Rela *) iplt; + r_type = ELF32_R_TYPE (reloc->r_info); + r_sym = ELF32_R_SYM (reloc->r_info); + + if (__builtin_expect ((r_type == R_PARISC_IPLT) && (r_sym == 0), 1)) + { + fptr = (struct fdesc *) (reloc->r_offset + l_addr); + /* Relocate this *ABS* entry, set only the gp, the rest is set later + when elf_machine_rela_relative is called (WITHOUT the linkmap) */ + fptr->gp = D_PTR (l, l_info[DT_PLTGOT]); + } /* r_type == R_PARISC_IPLT */ + } /* for all the relocations */ + } + return lazy; +} + +/* Initial entry point code for the dynamic linker. + The C function `_dl_start' is the real entry point; + its return value is the user program's entry point. */ + +#define RTLD_START \ +/* Set up dp for any non-PIC lib constructors that may be called. */ \ +static struct link_map * __attribute__((used)) \ +set_dp (struct link_map *map) \ +{ \ + register Elf32_Addr dp asm ("%r27"); \ + dp = D_PTR (map, l_info[DT_PLTGOT]); \ + asm volatile ("" : : "r" (dp)); \ + return map; \ +} \ + \ +asm ( \ +" .text\n" \ +" .globl _start\n" \ +" .type _start,@function\n" \ +"_start:\n" \ + /* The kernel does not give us an initial stack frame. */ \ +" ldo 64(%sp),%sp\n" \ + /* Save the relevant arguments (yes, those are the correct \ + registers, the kernel is weird) in their stack slots. */ \ +" stw %r25,-40(%sp)\n" /* argc */ \ +" stw %r24,-44(%sp)\n" /* argv */ \ + \ + /* We need the LTP, and we need it now. \ + $PIC_pcrel$0 points 8 bytes past the current instruction, \ + just like a branch reloc. This sequence gets us the \ + runtime address of _DYNAMIC. */ \ +" bl 0f,%r19\n" \ +" depi 0,31,2,%r19\n" /* clear priviledge bits */ \ +"0: addil L'_DYNAMIC - ($PIC_pcrel$0 - 8),%r19\n" \ +" ldo R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%r1),%r26\n" \ + \ + /* The link time address is stored in the first entry of the \ + GOT. */ \ +" addil L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 16),%r19\n" \ +" ldw R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 20)(%r1),%r20\n" \ + \ +" sub %r26,%r20,%r20\n" /* Calculate load offset */ \ + \ + /* Rummage through the dynamic entries, looking for \ + DT_PLTGOT. */ \ +" ldw,ma 8(%r26),%r19\n" \ +"1: cmpib,=,n 3,%r19,2f\n" /* tag == DT_PLTGOT? */ \ +" cmpib,<>,n 0,%r19,1b\n" \ +" ldw,ma 8(%r26),%r19\n" \ + \ + /* Uh oh! We didn't find one. Abort. */ \ +" iitlbp %r0,(%r0)\n" \ + \ +"2: ldw -4(%r26),%r19\n" /* Found it, load value. */ \ +" add %r19,%r20,%r19\n" /* And add the load offset. */ \ + \ + /* Our initial stack layout is rather different from everyone \ + else's due to the unique PA-RISC ABI. As far as I know it \ + looks like this: \ + \ + ----------------------------------- (this frame created above) \ + | 32 bytes of magic | \ + |---------------------------------| \ + | 32 bytes argument/sp save area | \ + |---------------------------------| ((current->mm->env_end) \ + | N bytes of slack | + 63 & ~63) \ + |---------------------------------| \ + | envvar and arg strings | \ + |---------------------------------| \ + | ELF auxiliary info | \ + | (up to 28 words) | \ + |---------------------------------| \ + | Environment variable pointers | \ + | upwards to NULL | \ + |---------------------------------| \ + | Argument pointers | \ + | upwards to NULL | \ + |---------------------------------| \ + | argc (1 word) | \ + ----------------------------------- \ + \ + So, obviously, we can't just pass %sp to _dl_start. That's \ + okay, argv-4 will do just fine. \ + \ + The pleasant part of this is that if we need to skip \ + arguments we can just decrement argc and move argv, because \ + the stack pointer is utterly unrelated to the location of \ + the environment and argument vectors. */ \ + \ + /* This is always within range so we'll be okay. */ \ +" bl _dl_start,%rp\n" \ +" ldo -4(%r24),%r26\n" \ + \ +" .globl _dl_start_user\n" \ +" .type _dl_start_user,@function\n" \ +"_dl_start_user:\n" \ + /* Save the entry point in %r3. */ \ +" copy %ret0,%r3\n" \ + \ + /* Remember the lowest stack address. */ \ +" addil LT'__libc_stack_end,%r19\n" \ +" ldw RT'__libc_stack_end(%r1),%r20\n" \ +" stw %sp,0(%r20)\n" \ + \ + /* See if we were called as a command with the executable file \ + name as an extra leading argument. */ \ +" addil LT'_dl_skip_args,%r19\n" \ +" ldw RT'_dl_skip_args(%r1),%r20\n" \ +" ldw 0(%r20),%r20\n" \ + \ +" ldw -40(%sp),%r25\n" /* argc */ \ +" comib,= 0,%r20,.Lnofix\n" /* FIXME: Mispredicted branch */\ +" ldw -44(%sp),%r24\n" /* argv (delay slot) */ \ + \ +" sub %r25,%r20,%r25\n" \ +" stw %r25,-40(%sp)\n" \ +" sh2add %r20,%r24,%r24\n" \ +" stw %r24,-44(%sp)\n" \ + \ +".Lnofix:\n" \ +" addil LT'_rtld_local,%r19\n" \ +" ldw RT'_rtld_local(%r1),%r26\n" \ +" bl set_dp, %r2\n" \ +" ldw 0(%r26),%r26\n" \ + \ + /* Call _dl_init(_dl_loaded, argc, argv, envp). */ \ +" copy %r28,%r26\n" \ + \ + /* envp = argv + argc + 1 */ \ +" sh2add %r25,%r24,%r23\n" \ +" bl _dl_init_internal,%r2\n" \ +" ldo 4(%r23),%r23\n" /* delay slot */ \ + \ + /* Reload argc, argv to the registers start.S expects. */ \ +" ldw -40(%sp),%r25\n" \ +" ldw -44(%sp),%r24\n" \ + \ + /* _dl_fini does have a PLT slot now. I don't know how to get \ + to it though, so this hack will remain. */ \ +" .section .data\n" \ +"__dl_fini_plabel:\n" \ +" .word _dl_fini\n" \ +" .word 0xdeadbeef\n" \ +" .previous\n" \ + \ + /* %r3 contains a function pointer, we need to mask out the \ + lower bits and load the gp and jump address. */ \ +" depi 0,31,2,%r3\n" \ +" ldw 0(%r3),%r2\n" \ +" addil LT'__dl_fini_plabel,%r19\n" \ +" ldw RT'__dl_fini_plabel(%r1),%r23\n" \ +" stw %r19,4(%r23)\n" \ +" ldw 4(%r3),%r19\n" /* load the object's gp */ \ +" bv %r0(%r2)\n" \ +" depi 2,31,2,%r23\n" /* delay slot */ \ + ); + + +/* This code gets called via the .plt stub, and is used in + dl-runtime.c to call the `fixup' function and then redirect to the + address it returns. + + WARNING: This template is also used by gcc's __cffc, and expects + that the "bl" for fixup() exist at a particular offset. + Do not change this template without changing gcc, while the prefix + "bl" should fix everything so gcc finds the right spot, it will + slow down __cffc when it attempts to call fixup to resolve function + descriptor references. Please refer to gcc/gcc/config/pa/fptr.c + + Enter with r19 = reloc offset, r20 = got-8, r21 = fixup ltp. */ +#define TRAMPOLINE_TEMPLATE(tramp_name, fixup_name) \ + extern void tramp_name (void); \ + asm ( \ + " .text\n" \ + /* FAKE bl to provide gcc's __cffc with fixup's address */ \ + " bl " #fixup_name ",%r2\n" /* Runtime address of fixup */ \ + " .globl " #tramp_name "\n" \ + " .type " #tramp_name ",@function\n" \ + #tramp_name ":\n" \ + " .proc\n" \ + " .callinfo frame=64,calls,save_rp\n" \ + " .entry\n" \ + /* Save return pointer */ \ + " stw %r2,-20(%sp)\n" \ + /* Save argument registers in the call stack frame. */ \ + " stw %r26,-36(%sp)\n" \ + " stw %r25,-40(%sp)\n" \ + " stw %r24,-44(%sp)\n" \ + " stw %r23,-48(%sp)\n" \ + /* Build a call frame, and save structure pointer. */ \ + " stwm %r28,64(%sp)\n" \ + \ + /* Set up args to fixup func. */ \ + " ldw 8+4(%r20),%r26\n" /* (1) got[1] == struct link_map */ \ + " copy %r19,%r25\n" /* (2) reloc offset */ \ + " copy %r2,%r24\n" /* (3) profile_fixup needs rp */ \ + \ + /* Call the real address resolver. */ \ + " bl " #fixup_name ",%r2\n" \ + " copy %r21,%r19\n" /* set fixup func ltp (DELAY SLOT)*/ \ + \ + " ldw 0(%r28),%r22\n" /* load up the returned func ptr */ \ + " ldw 4(%r28),%r19\n" \ + " ldwm -64(%sp),%r28\n" \ + /* Arguments. */ \ + " ldw -36(%sp),%r26\n" \ + " ldw -40(%sp),%r25\n" \ + " ldw -44(%sp),%r24\n" \ + " ldw -48(%sp),%r23\n" \ + /* Call the real function. */ \ + " bv %r0(%r22)\n" \ + /* Return pointer. */ \ + " ldw -20(%sp),%r2\n" \ + " .exit\n" \ + " .procend\n"); + +#ifndef PROF +#define ELF_MACHINE_RUNTIME_TRAMPOLINE \ + TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup); \ + TRAMPOLINE_TEMPLATE (_dl_runtime_profile, profile_fixup); +#else +#define ELF_MACHINE_RUNTIME_TRAMPOLINE \ + TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup); \ + strong_alias (_dl_runtime_resolve, _dl_runtime_profile); +#endif + +/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so + PLT entries should not be allowed to define the value. + ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one + of the main executable's symbols, as for a COPY reloc. */ +#define elf_machine_type_class(type) \ + ((((type) == R_PARISC_IPLT || (type) == R_PARISC_EPLT) \ + * ELF_RTYPE_CLASS_PLT) \ + | (((type) == R_PARISC_COPY) * ELF_RTYPE_CLASS_COPY)) + +/* Used by the runtime in fixup to figure out if reloc is *really* PLT */ +#define ELF_MACHINE_JMP_SLOT R_PARISC_IPLT +#define ELF_MACHINE_SIZEOF_JMP_SLOT PLT_ENTRY_SIZE + +/* We only use RELA. */ +#define ELF_MACHINE_NO_REL 1 + +/* Return the address of the entry point. */ +#define ELF_MACHINE_START_ADDRESS(map, start) \ + DL_STATIC_FUNCTION_ADDRESS (map, start) + +/* We define an initialization functions. This is called very early in + * _dl_sysdep_start. */ +#define DL_PLATFORM_INIT dl_platform_init () + +static inline void __attribute__ ((unused)) +dl_platform_init (void) +{ + if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0') + /* Avoid an empty string which would disturb us. */ + GLRO(dl_platform) = NULL; +} + +#endif /* !dl_machine_h */ + +/* These are only actually used where RESOLVE_MAP is defined, anyway. */ +#ifdef RESOLVE_MAP + +auto void __attribute__((always_inline)) +elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc, + const Elf32_Sym *sym, const struct r_found_version *version, + void *const reloc_addr_arg) +{ + Elf32_Addr *const reloc_addr = reloc_addr_arg; + const Elf32_Sym *const refsym = sym; + unsigned long const r_type = ELF32_R_TYPE (reloc->r_info); + struct link_map *sym_map; + Elf32_Addr value; + +# if !defined RTLD_BOOTSTRAP && !defined SHARED + /* This is defined in rtld.c, but nowhere in the static libc.a; make the + reference weak so static programs can still link. This declaration + cannot be done when compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP) + because rtld.c contains the common defn for _dl_rtld_map, which is + incompatible with a weak decl in the same file. */ + weak_extern (GL(dl_rtld_map)); +# endif + + /* RESOLVE_MAP will return a null value for undefined syms, and + non-null for all other syms. In particular, relocs with no + symbol (symbol index of zero), also called *ABS* relocs, will be + resolved to MAP. (The first entry in a symbol table is all + zeros, and an all zero Elf32_Sym has a binding of STB_LOCAL.) + See RESOLVE_MAP definition in elf/dl-reloc.c */ +# ifdef RTLD_BOOTSTRAP + /* RESOLVE_MAP in rtld.c doesn't have the local sym test. */ + sym_map = (ELF32_ST_BIND (sym->st_info) != STB_LOCAL + ? RESOLVE_MAP (&sym, version, r_type) : map); +# else + sym_map = RESOLVE_MAP (&sym, version, r_type); +# endif + if (sym_map) + { + value = sym ? sym_map->l_addr + sym->st_value : 0; + value += reloc->r_addend; + } + else + value = 0; + + switch (r_type) + { + case R_PARISC_DIR32: + /* .eh_frame can have unaligned relocs. */ + if ((unsigned long) reloc_addr_arg & 3) + { + char *rel_addr = (char *) reloc_addr_arg; + rel_addr[0] = value >> 24; + rel_addr[1] = value >> 16; + rel_addr[2] = value >> 8; + rel_addr[3] = value; + return; + } + break; + + case R_PARISC_PLABEL32: + /* Easy rule: If there is a symbol and it is global, then we + need to make a dynamic function descriptor. Otherwise we + have the address of a PLT slot for a local symbol which we + know to be unique. */ + if (sym == NULL + || sym_map == NULL + || ELF32_ST_BIND (sym->st_info) == STB_LOCAL) + { + break; + } + /* Set bit 30 to indicate to $$dyncall that this is a PLABEL. + We have to do this outside of the generic function descriptor + code, since it doesn't know about our requirement for setting + protection bits */ + value = (Elf32_Addr)((unsigned int)_dl_make_fptr (sym_map, sym, value) | 2); + break; + + case R_PARISC_IPLT: + if (__builtin_expect (sym_map != NULL, 1)) + { + elf_machine_fixup_plt (NULL, sym_map, reloc, reloc_addr, value); + } + else + { + /* If we get here, it's a (weak) undefined sym. */ + elf_machine_fixup_plt (NULL, map, reloc, reloc_addr, value); + } + return; + + case R_PARISC_COPY: + if (__builtin_expect (sym == NULL, 0)) + /* This can happen in trace mode if an object could not be + found. */ + break; + if (__builtin_expect (sym->st_size > refsym->st_size, 0) + || (__builtin_expect (sym->st_size < refsym->st_size, 0) + && __builtin_expect (GLRO(dl_verbose), 0))) + { + const char *strtab; + + strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]); + _dl_error_printf ("%s: Symbol `%s' has different size in shared object, " + "consider re-linking\n", + rtld_progname ?: "<program name unknown>", + strtab + refsym->st_name); + } + memcpy (reloc_addr_arg, (void *) value, + MIN (sym->st_size, refsym->st_size)); + return; + + case R_PARISC_NONE: /* Alright, Wilbur. */ + return; + + default: + _dl_reloc_bad_type (map, r_type, 0); + } + + *reloc_addr = value; +} + +/* hppa doesn't have an R_PARISC_RELATIVE reloc, but uses relocs with + ELF32_R_SYM (info) == 0 for a similar purpose. */ +auto void __attribute__((always_inline)) +elf_machine_rela_relative (Elf32_Addr l_addr, + const Elf32_Rela *reloc, + void *const reloc_addr_arg) +{ + unsigned long const r_type = ELF32_R_TYPE (reloc->r_info); + Elf32_Addr *const reloc_addr = reloc_addr_arg; + static char msgbuf[] = { "Unknown" }; + struct link_map map; + Elf32_Addr value; + + value = l_addr + reloc->r_addend; + + if (ELF32_R_SYM (reloc->r_info) != 0){ + _dl_error_printf ("%s: In elf_machine_rela_relative " + "ELF32_R_SYM (reloc->r_info) != 0. Aborting.", + rtld_progname ?: "<program name unknown>"); + ABORT_INSTRUCTION; /* Crash. */ + } + + switch (r_type) + { + case R_PARISC_DIR32: + /* .eh_frame can have unaligned relocs. */ + if ((unsigned long) reloc_addr_arg & 3) + { + char *rel_addr = (char *) reloc_addr_arg; + rel_addr[0] = value >> 24; + rel_addr[1] = value >> 16; + rel_addr[2] = value >> 8; + rel_addr[3] = value; + return; + } + break; + + case R_PARISC_PLABEL32: + break; + + case R_PARISC_IPLT: /* elf_machine_runtime_setup already set gp */ + break; + + case R_PARISC_NONE: + return; + + default: /* Bad reloc, map unknown (really it's the current map) */ + map.l_name = msgbuf; + _dl_reloc_bad_type (&map, r_type, 0); + return; + } + + *reloc_addr = value; +} + +auto void __attribute__((always_inline)) +elf_machine_lazy_rel (struct link_map *map, + Elf32_Addr l_addr, const Elf32_Rela *reloc) +{ + /* We don't have anything to do here. elf_machine_runtime_setup has + done all the relocs already. */ +} + +#endif /* RESOLVE_MAP */ |