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authorRoland McGrath <roland@gnu.org>1996-06-21 21:01:27 +0000
committerRoland McGrath <roland@gnu.org>1996-06-21 21:01:27 +0000
commit4f54cdb1dd4b8929231f42e22b79a0d5c7600cba (patch)
tree7780b1282b5f0849339424c2c94fc278f2dd8767 /sysdeps/sparc
parent51fbd1f60a5c43fc5bde04952bc88b5545a83d13 (diff)
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* sysdeps/sparc/elf/start.S: New file.
* sysdeps/sparc/dl-machine.h: New file. * posix/fnmatch.c (fnmatch): Fix \*[*?]+ case to increment name ptr only for ?s, not for *s. Fix from Chet Ramey. Fixes thanks to Raja R Harinath <harinath@cs.umn.edu>: * sysdeps/unix/sysv/utmpbits.h: Define _HAVE_UT_{TYPE,ID,TV,HOST}. Use __{BEGIN,END}_DECLS. (_PATH_WTMP, _PATH_UTMP, _PATH_LASTLOG): New macros. * login/utmp.h (UTMP_FILE, UTMP_FILENAME, WTMP_FILE, WTMP_FILENAME): New macros, moved here from sysdeps/gnu/utmpbits.h. * sysdeps/generic/utmpbits.h (_HAVE_UT_HOST): Define it. * sysdeps/gnu/utmpbits.h (_HAVE_UT_HOST): Likewise. * login/logout.c: Use ut_host only #if _HAVE_UT_HOST. Use sizeof instead of UT_*SIZE. * login/logwtmp.c: Likewise. * misc/tsearch.c (tdelete): Define as weak alias to __tdelete. * version.c (banner): Add trailing newline.
Diffstat (limited to 'sysdeps/sparc')
-rw-r--r--sysdeps/sparc/dl-machine.h250
-rw-r--r--sysdeps/sparc/elf/start.S111
2 files changed, 361 insertions, 0 deletions
diff --git a/sysdeps/sparc/dl-machine.h b/sysdeps/sparc/dl-machine.h
new file mode 100644
index 0000000..695b9d6
--- /dev/null
+++ b/sysdeps/sparc/dl-machine.h
@@ -0,0 +1,250 @@
+/* Machine-dependent ELF dynamic relocation inline functions. SPARC version.
+Copyright (C) 1996 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#define ELF_MACHINE_NAME "sparc"
+
+#include <assert.h>
+#include <string.h>
+#include <link.h>
+
+
+/* Some SPARC opcodes we need to use for self-modifying code. */
+#define OPCODE_NOP 0x01000000 /* nop */
+#define OPCODE_CALL 0x04000000 /* 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_SP64 0x9de3bfc0 /* save %sp, -64, %sp */
+
+
+/* Return nonzero iff E_MACHINE is compatible with the running host. */
+static inline int
+elf_machine_matches_host (Elf32_Half e_machine)
+{
+ switch (e_machine)
+ {
+ case EM_SPARC:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+
+/* Return the run-time address of the _GLOBAL_OFFSET_TABLE_.
+ Must be inlined in a function which uses global data. */
+static inline Elf32_Addr *
+elf_machine_got (void)
+{
+ register Elf32_Addr *got asm ("%l7");
+ return got;
+}
+
+
+/* Return the run-time load address of the shared object. */
+static inline Elf32_Addr
+elf_machine_load_address (void)
+{
+ Elf32_Addr addr;
+???
+ return addr;
+}
+
+/* The `subl' insn above will contain an R_68K_RELATIVE relocation
+ entry intended to insert the run-time address of the label `here'.
+ This will be the first relocation in the text of the dynamic
+ linker; we skip it to avoid trying to modify read-only text in this
+ early stage. */
+#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) \
+ ((dynamic_info)[DT_RELA]->d_un.d_ptr += sizeof (Elf32_Rela), \
+ (dynamic_info)[DT_RELASZ]->d_un.d_val -= sizeof (Elf32_Rela))
+
+/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
+ MAP is the object containing the reloc. */
+
+static inline void
+elf_machine_rela (struct link_map *map,
+ const Elf32_Rela *reloc, const Elf32_Sym *sym,
+ Elf32_Addr (*resolve) (const Elf32_Sym **ref,
+ Elf32_Addr reloc_addr,
+ int noplt))
+{
+ Elf32_Addr *const reloc_addr = (void *) (map->l_addr + reloc->r_offset);
+ Elf32_Addr loadbase;
+
+ switch (ELF32_R_TYPE (reloc->r_info))
+ {
+ case R_SPARC_COPY:
+ loadbase = (*resolve) (&sym, (Elf32_Addr) reloc_addr, 0);
+ memcpy (reloc_addr, (void *) (loadbase + sym->st_value), sym->st_size);
+ break;
+ case R_SPARC_GLOB_DAT:
+ case R_SPARC_32:
+ loadbase = (resolve ? (*resolve) (&sym, (Elf32_Addr) reloc_addr, 0) :
+ /* RESOLVE is null during bootstrap relocation. */
+ map->l_addr);
+ *reloc_addr = ((sym ? (loadbase + sym->st_value) : 0)
+ + reloc->r_addend);
+ break;
+ case R_SPARC_JMP_SLOT:
+ loadbase = (resolve ? (*resolve) (&sym, (Elf32_Addr) reloc_addr, 1) :
+ /* RESOLVE is null during bootstrap relocation. */
+ map->l_addr);
+ {
+ Elf32_Addr value = ((sym ? (loadbase + sym->st_value) : 0)
+ + reloc->r_addend);
+ reloc_addr[1] = OPCODE_SETHI | (value >> 10);
+ reloc_addr[2] = OPCODE_JMP_G1 | (value & 0x3ff);
+ }
+ break;
+ case R_SPARC_8:
+ loadbase = (*resolve) (&sym, (Elf32_Addr) reloc_addr, 0);
+ *(char *) reloc_addr = ((sym ? (loadbase + sym->st_value) : 0)
+ + reloc->r_addend);
+ break;
+ case R_SPARC_16:
+ loadbase = (*resolve) (&sym, (Elf32_Addr) reloc_addr, 0);
+ *(short *) reloc_addr = ((sym ? (loadbase + sym->st_value) : 0)
+ + reloc->r_addend);
+ break;
+ case R_SPARC_32:
+ loadbase = (resolve ? (*resolve) (&sym, (Elf32_Addr) reloc_addr, 0) :
+ /* RESOLVE is null during bootstrap relocation. */
+ map->l_addr);
+ break;
+ case R_SPARC_RELATIVE:
+ *reloc_addr = map->l_addr + reloc->r_addend;
+ break;
+ case R_SPARC_DISP8:
+ loadbase = (*resolve) (&sym, (Elf32_Addr) reloc_addr, 0);
+ *(char *) reloc_addr = ((sym ? (loadbase + sym->st_value) : 0)
+ + reloc->r_addend
+ - (Elf32_Addr) reloc_addr);
+ break;
+ case R_SPARC_DISP16:
+ loadbase = (*resolve) (&sym, (Elf32_Addr) reloc_addr, 0);
+ *(short *) reloc_addr = ((sym ? (loadbase + sym->st_value) : 0)
+ + reloc->r_addend
+ - (Elf32_Addr) reloc_addr);
+ break;
+ case R_SPARC_DISP32:
+ loadbase = (*resolve) (&sym, (Elf32_Addr) reloc_addr, 0);
+ *reloc_addr = ((sym ? (loadbase + sym->st_value) : 0)
+ + reloc->r_addend
+ - (Elf32_Addr) reloc_addr);
+ break;
+ case R_SPARC_NONE: /* Alright, Wilbur. */
+ break;
+ default:
+ assert (! "unexpected dynamic reloc type");
+ break;
+ }
+}
+
+static inline void
+elf_machine_lazy_rel (struct link_map *map, const Elf32_Rela *reloc)
+{
+ switch (ELF32_R_TYPE (reloc->r_info))
+ {
+ case R_SPARC_NONE:
+ break;
+ case R_SPARC_JMP_SLOT:
+ break;
+ default:
+ assert (! "unexpected PLT reloc type");
+ break;
+ }
+}
+
+/* Nonzero iff TYPE describes relocation of a PLT entry, so
+ PLT entries should not be allowed to define the value. */
+#define elf_machine_pltrel_p(type) ((type) == R_SPARC_JMP_SLOT)
+
+/* The SPARC never uses Elf32_Rel relocations. */
+#define ELF_MACHINE_NO_REL 1
+
+
+/* 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 void
+elf_machine_runtime_setup (struct link_map *l, int lazy)
+{
+ Elf32_Addr *plt;
+ extern void _dl_runtime_resolve (Elf32_Word);
+
+ if (l->l_info[DT_JMPREL] && lazy)
+ {
+ /* The entries for functions in the PLT have not yet been filled in.
+ Their initial contents will arrange when called to set the high 22
+ bits of %g1 with an offset into the .rela.plt section and jump to
+ the beginning of the PLT. */
+ plt = (Elf32_Addr *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr);
+
+ /* The beginning of the PLT does:
+
+ save %sp, -64, %sp
+ pltpc: call _dl_runtime_resolve
+ nop
+ .word MAP
+
+ This saves the register window containing the arguments, and the
+ PC value (pltpc) implicitly saved in %o7 by the call points near the
+ location where we store the link_map pointer for this object. */
+
+ plt[0] = OPCODE_SAVE_SP64; /* save %sp, -64, %sp */
+ /* Construct PC-relative word address. */
+ plt[1] = OPCODE_CALL | (((Elf32_Addr) &_dl_runtime_resolve -
+ (Elf32_Addr) &plt[1]) >> 2);
+ plt[2] = OPCODE_NOP; /* Fill call delay slot. */
+ plt[3] = l;
+ }
+
+ /* This code is used in dl-runtime.c to call the `fixup' function
+ and then redirect to the address it returns. */
+#define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
+| Trampoline for _dl_runtime_resolver
+ .globl _dl_runtime_resolve
+ .type _dl_runtime_resolve, @function
+_dl_runtime_resolve:
+ | Pass two args to fixup: the PLT address computed from the PC saved
+ | in the PLT's call insn, and the reloc offset passed in %g1.
+ ld [%o7 + 8], %o1 | Second arg, loaded from PLTPC[2].
+ call fixup
+ shrl %g1, 22, %o0 | First arg, set in delay slot of call.
+ | Jump to the real function.
+ jmpl %o0, %g0
+ | In the delay slot of that jump, restore the register window
+ | saved by the first insn of the PLT.
+ restore
+ .size _dl_runtime_resolve, . - _dl_runtime_resolve
+");
+/* The PLT uses Elf32_Rela relocs. */
+#define elf_machine_relplt elf_machine_rela
+}
+
+
+/* Mask identifying addresses reserved for the user program,
+ where the dynamic linker should not map anything. */
+#define ELF_MACHINE_USER_ADDRESS_MASK ???
+
+/* 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 asm (???)
diff --git a/sysdeps/sparc/elf/start.S b/sysdeps/sparc/elf/start.S
new file mode 100644
index 0000000..6dae08b
--- /dev/null
+++ b/sysdeps/sparc/elf/start.S
@@ -0,0 +1,111 @@
+/* Startup code compliant to the ELF SPARC ABI.
+Copyright (C) 1996 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+/* This is the canonical entry point, usually the first thing in the text
+ segment. The SVR4/SPARC ABI (NOTE: I don't actually have it) says that
+ when the entry point runs, most registers' values are unspecified,
+ except for:
+
+ %g1 Contains a function pointer to be registered with `atexit'.
+ This is how the dynamic linker arranges to have DT_FINI
+ functions called for shared libraries that have been loaded
+ before this code runs.
+
+ %sp The stack contains the arguments and environment:
+ 0(%sp) argc
+ 4(%sp) argv[0]
+ ...
+ (4*argc)(%sp) NULL
+ (4*(argc+1))(%sp) envp[0]
+ ...
+ NULL
+*/
+
+ .text
+ .align 16
+ .global _start
+_start:
+ /* %g1 contains the address of the shared library termination
+ function, which we will register with `atexit' to be called by
+ `exit'. I suspect that on some systems, and when statically
+ linked, this will not be set by anything to any function
+ pointer; hopefully it will be zero so we don't try to call
+ random pointers. */
+ orcc %g1, %g0, %o0 /* Move %g1 to %o0 while testing it. */
+ be nofini
+
+ /* In delay slot: clear the frame pointer. The ABI suggests this
+ be done, to mark the outermost frame obviously. */
+ clr %fp
+
+ /* Call atexit, argument was set in %o0 above. */
+ call atexit
+ nop
+nofini:
+
+ /* We will use some local variables in registers below. %g1 and
+ the %oN registers are call-clobbered, so we can't just use them. */
+#define ARGC %l0
+#define ARGV %l1
+#define ENVP %l2
+#define TMP %l3
+
+ /* Do essential libc initialization. In statically linked
+ programs under the GNU Hurd, this is what sets up the
+ arguments on the stack for the code below. */
+ call __libc_init_first
+ sethi %hi(_environ), TMP /* In delay slot: prepare to use &_environ. */
+
+ /* Extract the arguments and environment as encoded on the stack
+ and save them in local variables. */
+ ld [%sp + 64], ARGC /* After the register save area, ARGC. */
+ add %sp, 64+4, ARGV /* Next, the ARGV elements. */
+ /* After ARGC words that are the ARGV elements, and a zero word,
+ are the ENVP elements. Do ENVP = &ARGV[ARGC + 1]. */
+ add ARGC, 1, ENVP
+ sll ENVP, 2, ENVP
+ add ARGV, ENVP, ENVP
+ /* Store ENVP in the global variable `_environ'. */
+ st [TMP + %lo(_environ)], ENVP
+
+ /* Call `_init', which is the entry point to our own `.init'
+ section; and register with `atexit' to have `exit' call
+ `_fini', which is the entry point to our own `.fini' section. */
+ call _init
+ sethi %hi(_fini), TMP /* In delay slot of call. */
+ or TMP, %lo(_fini), %o0 /* Argument to atexit is &_fini. */
+ call atexit
+ nop
+
+ /* Call the user's main function, and exit with its value. */
+ mov ARGC, %o0
+ mov ARGV, %o1
+ call main
+ mov ENVP, %o2
+
+ call exit /* This should never return. */
+ unimp 0 /* Crash if somehow it does return. */
+
+/* Define a symbol for the first piece of initialized data. */
+ .data
+ .global __data_start
+__data_start:
+ .long 0
+ .weak data_start
+ data_start = __data_start