[Q12] ``The `gencat' utility cannot process the input which are
successfully used on my Linux libc based system. Why?''
+
+[Q13] ``How do I configure GNU libc so that the essential libraries
+ like libc.so go into /lib and the other into /usr/lib?''
\f
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
[Q1] ``What systems does the GNU C Library run on?''
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
-
[Q11] ``Where are the DST_* constants found in <sys/time.h> on many
systems?''
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
-
[Q12] ``The `gencat' utility cannot process the input which are
successfully used on my Linux libc based system. Why?''
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
+[Q13] ``How do I configure GNU libc so that the essential libraries
+ like libc.so go into /lib and the other into /usr/lib?''
+
+[A13] {UD} Like all other GNU packages GNU libc is configured to use a
+base directory and install all files relative to this. If you intend
+to really use GNU libc on your system this base directory is /usr. I.e.,
+you run
+ configure --prefix=/usr <other_options>
+
+Some systems like Linux have a filesystem standard which makes a
+difference between essential libraries and others. Essential
+libraries are placed in /lib because this directory is required to be
+located on the same disk partition as /. The /usr subtree might be
+found on another partition/disk.
+
+To install the essential libraries which come with GNU libc in /lib
+one must explicitly tell this. Autoconf has no option for this so you
+have to use the file where all user supplied additional information
+should go in: `configparms' (see the `INSTALL' file). For Linux the
+`configparms' file should contain:
+
+slibdir=/lib
+sysconfdir=/etc
+
+The first line specifies the directory for the essential libraries,
+the second line the directory for file which are by tradition placed
+in a directory named /etc.
+
+
+~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
\f
Answers were given by:
{UD} Ulrich Drepper, <drepper@cygnus.com>
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
-/* This was written in the absense of an ABI -- don't expect
+/* This was written in the absence of an ABI -- don't expect
it to remain unchanged. */
+#ifndef dl_machine_h
+#define dl_machine_h 1
+
#define ELF_MACHINE_NAME "alpha"
#include <assert.h>
#include <string.h>
-#include <link.h>
/* Return nonzero iff E_MACHINE is compatible with the running host. */
return e_machine == EM_ALPHA;
}
-
/* Return the run-time address of the _GLOBAL_OFFSET_TABLE_.
Must be inlined in a function which uses global data. */
static inline Elf64_Addr *
return (Elf64_Addr *)(gp - 0x8000);
}
-
/* Return the run-time load address of the shared object. */
static inline Elf64_Addr
elf_machine_load_address (void)
return dot + 4 + zero_disp;
}
+/* 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)
+{
+ Elf64_Addr plt;
+ extern void _dl_runtime_resolve (void);
+
+ if (l->l_info[DT_JMPREL] && lazy)
+ {
+ /* The GOT entries for the functions in the PLT have not been
+ filled in yet. Their initial contents are directed to the
+ PLT which arranges for the dynamic linker to be called. */
+ plt = l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr;
+
+ /* This function will be called to perform the relocation. */
+ *(Elf64_Addr *)(plt + 16) = (Elf64_Addr) &_dl_runtime_resolve;
+
+ /* Identify this shared object */
+ *(Elf64_Addr *)(plt + 24) = (Elf64_Addr) 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
+ .ent _dl_runtime_resolve
+_dl_runtime_resolve:
+ lda $sp, -168($sp)
+ .frame $sp, 168, $26
+ /* Preserve all registers that C normally doesn't. */
+ stq $26, 0($sp)
+ stq $0, 8($sp)
+ stq $1, 16($sp)
+ stq $2, 24($sp)
+ stq $3, 32($sp)
+ stq $4, 40($sp)
+ stq $5, 48($sp)
+ stq $6, 56($sp)
+ stq $7, 64($sp)
+ stq $8, 72($sp)
+ stq $16, 80($sp)
+ stq $17, 88($sp)
+ stq $18, 96($sp)
+ stq $19, 104($sp)
+ stq $20, 112($sp)
+ stq $21, 120($sp)
+ stq $22, 128($sp)
+ stq $23, 136($sp)
+ stq $24, 144($sp)
+ stq $25, 152($sp)
+ stq $29, 160($sp)
+ .mask 0x27ff01ff, -168
+ /* Set up our $gp */
+ br $gp, .+4
+ ldgp $gp, 0($gp)
+ .prologue 1
+ /* Set up the arguments for _dl_runtime_resolve. */
+ /* $16 = link_map out of plt0 */
+ ldq $16, 8($27)
+ /* $17 = offset of reloc entry */
+ mov $28, $17
+ /* Do the fixup */
+ bsr $26, fixup..ng
+ /* Move the destination address to a safe place. */
+ mov $0, $27
+ /* Restore program registers. */
+ ldq $26, 0($sp)
+ ldq $0, 8($sp)
+ ldq $1, 16($sp)
+ ldq $2, 24($sp)
+ ldq $3, 32($sp)
+ ldq $4, 40($sp)
+ ldq $5, 48($sp)
+ ldq $6, 56($sp)
+ ldq $7, 64($sp)
+ ldq $8, 72($sp)
+ ldq $16, 80($sp)
+ ldq $17, 88($sp)
+ ldq $18, 96($sp)
+ ldq $19, 104($sp)
+ ldq $20, 112($sp)
+ ldq $21, 120($sp)
+ ldq $22, 128($sp)
+ ldq $23, 136($sp)
+ ldq $24, 144($sp)
+ ldq $25, 152($sp)
+ ldq $29, 160($sp)
+ /* Clean up and turn control to the destination */
+ lda $sp, 168($sp)
+ jmp $31, ($27)
+ .end _dl_runtime_resolve");
+
+/* The PLT uses Elf_Rel relocs. */
+#define elf_machine_relplt elf_machine_rela
+
+/* Mask identifying addresses reserved for the user program,
+ where the dynamic linker should not map anything. */
+/* FIXME */
+#define ELF_MACHINE_USER_ADDRESS_MASK (~0x1FFFFFFFFUL)
+
+/* 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 ("\
+.text
+ .globl _start
+ .globl _dl_start_user
+_start:
+ br $gp,.+4
+ ldgp $gp, 0($gp)
+ /* Pass pointer to argument block to _dl_start. */
+ mov $sp, $16
+ bsr $26, _dl_start..ng
+_dl_start_user:
+ /* Save the user entry point address in s0. */
+ mov $0, $9
+ /* See if we were run as a command with the executable file
+ name as an extra leading argument. If so, adjust the stack
+ pointer to skip _dl_skip_args words. */
+ ldl $1, _dl_skip_args
+ beq $1, 0f
+ ldq $2, 0($sp)
+ subq $2, $1, $2
+ s8addq $1, $sp, $sp
+ stq $2, 0($sp)
+ /* Load _dl_default_scope[2] into s1 to pass to _dl_init_next. */
+0: ldq $10, _dl_default_scope+16
+ /* Call _dl_init_next to return the address of an initalizer
+ function to run. */
+1: mov $10, $16
+ jsr $26, _dl_init_next
+ ldgp $gp, 0($26)
+ beq $0, 2f
+ mov $0, $27
+ jsr $26, ($0)
+ ldgp $gp, 0($26)
+ br 1b
+2: /* Pass our finalizer function to the user in $0. */
+ lda $0, _dl_fini
+ /* Jump to the user's entry point. */
+ mov $9, $27
+ jmp ($9)");
+
+/* 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_ALPHA_JMP_SLOT)
+
+/* The alpha never uses Elf64_Rel relocations. */
+#define ELF_MACHINE_NO_REL 1
+
+#endif /* !dl_machine_h */
+
+#ifdef RESOLVE
/* Fix up the instructions of a PLT entry to invoke the function
rather than the dynamic linker. */
static inline void
elf_machine_rela (struct link_map *map,
const Elf64_Rela *reloc,
- const Elf64_Sym *sym,
- Elf64_Addr (*resolve) (const Elf64_Sym **ref,
- Elf64_Addr reloc_addr,
- int noplt))
+ const Elf64_Sym *sym)
{
- Elf64_Addr *const reloc_addr = (void *)(map->l_addr + reloc->r_offset);
- unsigned long r_info = ELF64_R_TYPE (reloc->r_info);
+ Elf64_Addr * const reloc_addr = (void *)(map->l_addr + reloc->r_offset);
+ unsigned long const r_info = ELF64_R_TYPE (reloc->r_info);
+
#ifndef RTLD_BOOTSTRAP
/* 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
if (r_info == R_ALPHA_RELATIVE)
{
- /* Already done in dynamic linker. */
#ifndef RTLD_BOOTSTRAP
+ /* Already done in dynamic linker. */
if (map != &_dl_rtld_map)
#endif
*reloc_addr += map->l_addr;
{
Elf64_Addr loadbase, sym_value;
-#ifndef RTLD_BOOTSTRAP
- loadbase = (*resolve)(&sym, (Elf64_Addr)reloc_addr,
- r_info == R_ALPHA_JMP_SLOT);
-#else
- loadbase = map->l_addr;
-#endif
+ loadbase = RESOLVE (&sym, (Elf64_Addr)reloc_addr,
+ r_info == R_ALPHA_JMP_SLOT);
sym_value = sym ? loadbase + sym->st_value : 0;
if (r_info == R_ALPHA_GLOB_DAT)
static inline void
elf_machine_lazy_rel (struct link_map *map, const Elf64_Rela *reloc)
{
- Elf64_Addr *const reloc_addr = (void *)(map->l_addr + reloc->r_offset);
- unsigned long r_info = ELF64_R_TYPE (reloc->r_info);
+ Elf64_Addr * const reloc_addr = (void *)(map->l_addr + reloc->r_offset);
+ unsigned long const r_info = ELF64_R_TYPE (reloc->r_info);
if (r_info == R_ALPHA_JMP_SLOT)
{
*reloc_addr += map->l_addr;
}
else if (r_info == R_ALPHA_NONE)
- ;
+ return;
else
assert (! "unexpected PLT reloc type");
}
-/* The alpha never uses Elf_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)
-{
- Elf64_Addr plt;
- extern void _dl_runtime_resolve (void);
-
- if (l->l_info[DT_JMPREL] && lazy)
- {
- /* The GOT entries for the functions in the PLT have not been
- filled in yet. Their initial contents are directed to the
- PLT which arranges for the dynamic linker to be called. */
- plt = l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr;
-
- /* This function will be called to perform the relocation. */
- *(Elf64_Addr *)(plt + 16) = (Elf64_Addr) &_dl_runtime_resolve;
-
- /* Identify this shared object */
- *(Elf64_Addr *)(plt + 24) = (Elf64_Addr) 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
- .ent _dl_runtime_resolve
-_dl_runtime_resolve:
- lda $sp, -168($sp)
- .frame $sp, 168, $26
- /* Preserve all registers that C normally doesn't. */
- stq $26, 0($sp)
- stq $0, 8($sp)
- stq $1, 16($sp)
- stq $2, 24($sp)
- stq $3, 32($sp)
- stq $4, 40($sp)
- stq $5, 48($sp)
- stq $6, 56($sp)
- stq $7, 64($sp)
- stq $8, 72($sp)
- stq $16, 80($sp)
- stq $17, 88($sp)
- stq $18, 96($sp)
- stq $19, 104($sp)
- stq $20, 112($sp)
- stq $21, 120($sp)
- stq $22, 128($sp)
- stq $23, 136($sp)
- stq $24, 144($sp)
- stq $25, 152($sp)
- stq $29, 160($sp)
- .mask 0x27ff01ff, -168
- /* Set up our $gp */
- br $gp, .+4
- ldgp $gp, 0($gp)
- .prologue 1
- /* Set up the arguments for _dl_runtime_resolve. */
- /* $16 = link_map out of plt0 */
- ldq $16, 8($27)
- /* $17 = offset of reloc entry */
- mov $28, $17
- /* Do the fixup */
- bsr $26, fixup..ng
- /* Move the destination address to a safe place. */
- mov $0, $27
- /* Restore program registers. */
- ldq $26, 0($sp)
- ldq $0, 8($sp)
- ldq $1, 16($sp)
- ldq $2, 24($sp)
- ldq $3, 32($sp)
- ldq $4, 40($sp)
- ldq $5, 48($sp)
- ldq $6, 56($sp)
- ldq $7, 64($sp)
- ldq $8, 72($sp)
- ldq $16, 80($sp)
- ldq $17, 88($sp)
- ldq $18, 96($sp)
- ldq $19, 104($sp)
- ldq $20, 112($sp)
- ldq $21, 120($sp)
- ldq $22, 128($sp)
- ldq $23, 136($sp)
- ldq $24, 144($sp)
- ldq $25, 152($sp)
- ldq $29, 160($sp)
- /* Clean up and turn control to the destination */
- lda $sp, 168($sp)
- jmp $31, ($27)
- .end _dl_runtime_resolve");
-
-/* The PLT uses Elf_Rel relocs. */
-#define elf_machine_relplt elf_machine_rela
-
-/* Mask identifying addresses reserved for the user program,
- where the dynamic linker should not map anything. */
-/* FIXME */
-#define ELF_MACHINE_USER_ADDRESS_MASK (~0x1FFFFFFFFUL)
-
-/* 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 ("\
-.text
- .globl _start
- .globl _dl_start_user
-_start:
- br $gp,.+4
- ldgp $gp, 0($gp)
- /* Pass pointer to argument block to _dl_start. */
- mov $sp, $16
- bsr $26, _dl_start..ng
-_dl_start_user:
- /* Save the user entry point address in s0. */
- mov $0, $9
- /* See if we were run as a command with the executable file
- name as an extra leading argument. If so, adjust the stack
- pointer to skip _dl_skip_args words. */
- ldl $1, _dl_skip_args
- beq $1, 0f
- ldq $2, 0($sp)
- subq $2, $1, $2
- s8addq $1, $sp, $sp
- stq $2, 0($sp)
- /* Load _dl_default_scope[2] into s1 to pass to _dl_init_next. */
-0: ldq $10, _dl_default_scope+16
- /* Call _dl_init_next to return the address of an initalizer
- function to run. */
-1: mov $10, $16
- jsr $26, _dl_init_next
- ldgp $gp, 0($26)
- beq $0, 2f
- mov $0, $27
- jsr $26, ($0)
- ldgp $gp, 0($26)
- br 1b
-2: /* Pass our finalizer function to the user in $0. */
- lda $0, _dl_fini
- /* Jump to the user's entry point. */
- mov $9, $27
- jmp ($9)");
+#endif /* RESOLVE */
projects / platform / upstream / linaro-glibc.git / commitdiff