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Diffstat (limited to 'sysdeps/sparc/sparc32/dl-machine.h')
-rw-r--r--sysdeps/sparc/sparc32/dl-machine.h372
1 files changed, 187 insertions, 185 deletions
diff --git a/sysdeps/sparc/sparc32/dl-machine.h b/sysdeps/sparc/sparc32/dl-machine.h
index f7bcba0c2f..7c547f24ba 100644
--- a/sysdeps/sparc/sparc32/dl-machine.h
+++ b/sysdeps/sparc/sparc32/dl-machine.h
@@ -30,7 +30,7 @@
#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_SP64 0x9de3bfc0 /* save %sp, -64, %sp */
+#define OPCODE_SAVE_SP 0x9de3bfa8 /* save %sp, -(16+6)*4, %sp */
/* Return nonzero iff E_MACHINE is compatible with the running host. */
@@ -55,7 +55,7 @@ elf_machine_dynamic (void)
static inline Elf32_Addr
elf_machine_load_address (void)
{
- register Elf32_Addr pc __asm("%o7"), got;
+ register Elf32_Addr pc __asm("%o7"), pic __asm("%l7"), got;
/* Utilize the fact that a local .got entry will be partially
initialized at startup awaiting its RELATIVE fixup. */
@@ -64,50 +64,187 @@ elf_machine_load_address (void)
".Load_address:\n\t"
"call 1f\n\t"
"or %1,%%lo(.Load_address),%1\n"
- "1:\tld [%%l7+%1],%1"
- : "=r"(pc), "=r"(got));
+ "1:\tld [%2+%1],%1"
+ : "=r"(pc), "=r"(got) : "r"(pic));
return pc - got;
}
- Elf32_Addr addr;
-
- asm (
- "add %%fp,0x44,%%o2\n\t" /* o2 = point to argc */
- "ld [%%o2 - 4],%%o0\n\t" /* o0 = load argc */
- "sll %%o0, 2, %%o0\n\t" /* o0 = argc * sizeof (int) */
- "add %%o2,%%o0,%%o2\n\t" /* o2 = skip over argv */
- "add %%o2,4,%%o2\n\t" /* skip over null after argv */
-
- /* Now %o2 is pointing to env, skip over that as well. */
- "1:\n\t"
- "ld [%%o2],%%o0\n\t"
- "cmp %%o0,0\n\t"
- "bnz 1b\n\t"
- "add %%o2,4,%%o2\n\t"
-
- /* Note that above, we want to advance the NULL after envp so
- we always add 4. */
-
- /* Now, search for the AT_BASE property. */
- "2:\n\t"
- "ld [%%o2],%%o0\n\t"
- "cmp %%o0,0\n\t"
- "be,a 3f\n\t"
- "or %%g0,%%g0,%0\n\t"
- "cmp %%o0,7\n\t" /* AT_BASE = 7 */
- "be,a 3f\n\t"
- "ld [%%o2+4],%0\n\t"
- "b 2b\n\t"
- "add %%o2,8,%%o2\n\t"
- /* At this point %0 has the load address for the interpreter */
- "3:\n\t"
- : "=r" (addr)
- : /* no inputs */
- : "o0", "o2");
- return addr;
+/* 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 *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_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] = (Elf32_Addr) l;
+ }
+
+ return lazy;
}
+/* 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 ("\
+ .globl _dl_runtime_resolve
+ .type _dl_runtime_resolve, @function
+_dl_runtime_resolve:
+ /* Set up the arguments to fixup --
+ %o0 = link_map out of plt0
+ %o1 = offset of reloc entry */
+ ld [%o7 + 8], %o0
+ srl %g1, 10, %o1
+ call fixup
+ sub %o1, 4*12, %o1
+ jmp %o0
+ restore
+ .size _dl_runtime_resolve, . - _dl_runtime_resolve");
+
+/* The address of the JMP_SLOT reloc is the .plt entry, thus we don't
+ dereference the reloc's addr to get the final destination. Ideally
+ there would be a generic way to return the value of the symbol from
+ elf_machine_relplt, but as it is, the address of the .plt entry is
+ good enough. */
+#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_SPARC_COPY)
+
+/* Nonzero iff TYPE describes relocation of a PLT entry, so
+ PLT entries should not be allowed to define the value. */
+#define elf_machine_lookup_noplt_p(type) ((type) == R_SPARC_JMP_SLOT)
+
+/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
+#define ELF_MACHINE_RELOC_NOPLT R_SPARC_JMP_SLOT
+
+/* The SPARC never uses Elf32_Rel relocations. */
+#define ELF_MACHINE_NO_REL 1
+
+/* The SPARC overlaps DT_RELA and DT_PLTREL. */
+#define ELF_MACHINE_PLTREL_OVERLAP 1
+
+/* The PLT uses Elf32_Rela relocs. */
+#define elf_machine_relplt elf_machine_rela
+
+/* 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
+ .type _start,@function
+_start:
+ /* Allocate space for functions to drop their arguments. */
+ sub %sp, 6*4, %sp
+ /* Pass pointer to argument block to _dl_start. */
+ call _dl_start
+ add %sp, 22*4, %o0
+ /* FALTHRU */
+ .globl _dl_start_user
+ .type _dl_start_user,@function
+_dl_start_user:
+ /* Load the PIC register. */
+1: call 2f
+ sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7
+2: or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7
+ add %l7, %o7, %l7
+ /* Save the user entry point address in %l0 */
+ mov %o0, %l0
+ /* See if we were run as a command with the executable file name as an
+ extra leading argument. If so, adjust the contents of the stack. */
+ sethi %hi(_dl_skip_args), %g2
+ or %g2, %lo(_dl_skip_args), %g2
+ ld [%l7+%g2], %i0
+ ld [%i0], %i0
+ tst %i0
+ beq 3f
+ nop
+ /* Find out how far to shift. */
+ ld [%sp+22*4], %i1 /* load argc */
+ sub %i1, %i0, %i1
+ sll %i0, 2, %i2
+ st %i1, [%sp+22*4]
+ add %sp, 23*4, %i1
+ add %i1, %i2, %i2
+ /* Copy down argv */
+21: ld [%i2], %i3
+ add %i2, 4, %i2
+ tst %i3
+ st %i3, [%i1]
+ bne 21b
+ add %i1, 4, %i1
+ /* Copy down env */
+22: ld [%i2], %i3
+ add %i2, 4, %i2
+ tst %i3
+ st %i3, [%i1]
+ bne 22b
+ add %i1, 4, %i1
+ /* Copy down auxiliary table. */
+23: ld [%i2], %i3
+ ld [%i2+4], %i4
+ add %i2, 8, %i2
+ tst %i3
+ st %i3, [%i1]
+ st %i4, [%i1+4]
+ bne 23b
+ add %i1, 8, %i1
+ /* Load _dl_default_scope[2] to pass to _dl_init_next. */
+3: sethi %hi(_dl_default_scope), %g1
+ or %g1, %lo(_dl_default_scope), %g1
+ ld [%l7+%g1], %l1
+ ld [%l1+2*4], %l1
+ /* Call _dl_init_next to return the address of an initializer to run. */
+4: call _dl_init_next
+ mov %l1, %o0
+ tst %o0
+ beq 5f
+ nop
+ jmpl %o0, %o7
+ nop
+ ba,a 4b
+ /* Clear the startup flag. */
+5: sethi %hi(_dl_starting_up), %g1
+ or %g1, %lo(_dl_starting_up), %g1
+ ld [%l7+%g1], %g1
+ st %g0, [%g1]
+ /* Pass our finalizer function to the user in %g1. */
+ sethi %hi(_dl_fini), %g1
+ or %g1, %lo(_dl_fini), %g1
+ ld [%l7+%g1], %g1
+ /* Jump to the user's entry point and deallocate the extra stack we got. */
+ jmp %l0
+ add %sp, 6*4, %sp
+ .size _dl_start_user,.-_dl_start_user");
+
#ifdef RESOLVE
/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
MAP is the object containing the reloc. */
@@ -117,7 +254,7 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
const Elf32_Sym *sym, const struct r_found_version *version,
Elf32_Addr *const reloc_addr)
{
- Elf32_Addr loadbase;
+ extern unsigned long _dl_hwcap;
if (ELF32_R_TYPE (reloc->r_info) == R_SPARC_RELATIVE)
{
@@ -144,6 +281,7 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
switch (ELF32_R_TYPE (reloc->r_info))
{
case R_SPARC_COPY:
+#ifndef RTLD_BOOTSTRAP
if (sym->st_size > refsym->st_size
|| (_dl_verbose && sym->st_size < refsym->st_size))
{
@@ -159,14 +297,21 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
}
memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
refsym->st_size));
+#endif
break;
case R_SPARC_GLOB_DAT:
case R_SPARC_32:
*reloc_addr = value;
break;
case R_SPARC_JMP_SLOT:
- reloc_addr[1] = OPCODE_SETHI_G1 | (value >> 10);
+ /* For thread safety, write the instructions from the bottom and
+ flush before we overwrite the critical "b,a". */
reloc_addr[2] = OPCODE_JMP_G1 | (value & 0x3ff);
+ if (1 || (_dl_hwcap & 1)) /* HWCAP_SPARC_FLUSH */
+ __asm __volatile ("flush %0+8" : : "r"(reloc_addr));
+ reloc_addr[1] = OPCODE_SETHI_G1 | (value >> 10);
+ if (1 || (_dl_hwcap & 1)) /* HWCAP_SPARC_FLUSH */
+ __asm __volatile ("flush %0+4" : : "r"(reloc_addr));
break;
case R_SPARC_8:
*(char *) reloc_addr = value;
@@ -218,146 +363,3 @@ elf_machine_lazy_rel (struct link_map *map, const Elf32_Rela *reloc)
}
#endif /* RESOLVE */
-
-/* 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_SPARC_COPY)
-
-/* Nonzero iff TYPE describes relocation of a PLT entry, so
- PLT entries should not be allowed to define the value. */
-#define elf_machine_lookup_noplt_p(type) ((type) == R_SPARC_JMP_SLOT)
-
-/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
-#define ELF_MACHINE_RELOC_NOPLT R_SPARC_JMP_SLOT
-
-/* The SPARC never uses Elf32_Rel relocations. */
-#define ELF_MACHINE_NO_REL 1
-
-/* The SPARC overlaps DT_RELA and DT_PLTREL. */
-#define ELF_MACHINE_PLTREL_OVERLAP 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 int
-elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
-{
- 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] = (Elf32_Addr *) l;
- }
-
- return lazy;
-}
-
-/* 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:
- t 1
- #call %g0
- # 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__ ( \
-".text\n\
- .globl _start\n\
- .type _start,@function\n\
-_start:\n\
- /* Pass pointer to argument block to _dl_start. */\n\
- add %sp,64,%o0\n\
- call _dl_start\n\
- nop\n\
- \n\
- mov %o0,%l0\n\
- \n\
-2:\n\
- call 1f\n\
- nop\n\
-1:\n\
- sethi %hi(_GLOBAL_OFFSET_TABLE_-(2b-.)),%l2\n\
- sethi %hi(_dl_default_scope),%l3\n\
- or %l2,%lo(_GLOBAL_OFFSET_TABLE_-(2b-.)),%l2\n\
- or %l3,%lo(_dl_default_scope),%l3\n\
- add %o7,%l2,%l1\n\
- # %l1 has the GOT. %l3 has _dl_default_scope GOT offset\n\
- ld [%l1+%l3],%l4\n\
- # %l4 has pointer to _dl_default_scope. Now, load _dl_default_scope [2]\n\
- ld [%l4+8],%l4\n\
- # %l4 has _dl_default_scope [2]\n\
- # call _dl_init_next until it returns 0, pass _dl_default_scope [2]\n\
-3:\n\
- call _dl_init_next\n\
- mov %l4,%o0\n\
- cmp %o0,%g0\n\
- bz,a 4f\n\
- nop\n\
- call %o0\n\
- /* Pass pointer to argument block to this init function */\n\
- add %sp,64,%o0\n\
- b,a 3b\n\
-4:\n\
- # Clear the _dl_starting_up variable and pass _dl_fini in %g1 as per ELF ABI.\n\
- sethi %hi(_dl_starting_up),%l4\n\
- sethi %hi(_dl_fini),%l3\n\
- or %l4,%lo(_dl_starting_up),%l4\n\
- or %l3,%lo(_dl_fini),%l3\n\
- # clear _dl_starting_up\n\
- ld [%l1+%l4],%l5\n\
- st %g0,[%l5]\n\
- # load out fini function for atexit in %g1\n\
- ld [%l3+%l1],%g1\n\
- # jump to the user program entry point.\n\
- jmpl %l0,%g0\n\
- nop\n\
-");
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-17 02:03:33 +0000