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(RTLD_START):Rewrite for new init function interface.

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This commit is contained in:
Ulrich Drepper 2000-04-15 16:53:23 +00:00
parent 245bff9408
commit f0824b0c78
1 changed files with 49 additions and 22 deletions
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71
sysdeps/alpha/dl-machine.h
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@ -289,37 +289,64 @@ _dl_start_user:
/* Store the highest stack address. */ /* Store the highest stack address. */
stq $30, __libc_stack_end stq $30, __libc_stack_end
/* See if we were run as a command with the executable file /* See if we were run as a command with the executable file
name as an extra leading argument. If so, adjust the stack name as an extra leading argument. */
pointer to skip _dl_skip_args words. */
ldl $1, _dl_skip_args ldl $1, _dl_skip_args
beq $1, 0f beq $1, $fixup_stack
ldq $2, 0($sp) $fixup_stack_ret:
subq $2, $1, $2 /* The special initializer gets called with the stack just
s8addq $1, $sp, $sp as the application's entry point will see it; it can
stq $2, 0($sp) switch stacks if it moves these contents over. */
/* Load _dl_main_searchlist into s1 to pass to _dl_init_next. */ " RTLD_START_SPECIAL_INIT "
0: ldq $10, _dl_main_searchlist /* Call _dl_init(_dl_loaded, argc, argv, envp) to run initializers. */
/* Call _dl_init_next to return the address of an initializer ldq $16, _dl_loaded
function to run. */ ldq $17, 0($sp)
1: mov $10, $16 lda $18, 8($sp)
jsr $26, _dl_init_next s8addq $17, 8, $19
ldgp $gp, 0($26) addq $19, $18, $19
beq $0, 2f jsr $26, _dl_init
mov $0, $27
jsr $26, ($0)
ldgp $gp, 0($26)
br 1b
2: /* Clear the startup flag. */
stl $31, _dl_starting_up
/* Pass our finalizer function to the user in $0. */ /* Pass our finalizer function to the user in $0. */
lda $0, _dl_fini lda $0, _dl_fini
/* Jump to the user's entry point. */ /* Jump to the user's entry point. */
mov $9, $27 mov $9, $27
jmp ($9) jmp ($9)
$fixup_stack:
/* Adjust the stack pointer to skip _dl_skip_args words. This
involves copying everything down, since the stack pointer must
always be 16-byte aligned. */
ldq $2, 0($sp)
subq $2, $1, $2
mov $sp, $4
s8addq $2, $sp, $3
stq $2, 0($sp)
/* Copy down argv. */
0: ldq $5, 8($3)
addq $4, 8, $4
addq $3, 8, $3
stq $5, 0($4)
bne $5, 0b
/* Copy down envp. */
1: ldq $5, 8($3)
addq $4, 8, $4
addq $3, 8, $3
stq $5, 0($4)
bne $5, 1b
/* Copy down auxiliary table. */
2: ldq $5, 8($3)
ldq $6, 16($3)
addq $4, 16, $4
addq $3, 16, $3
stq $5, -8($4)
stq $6, 0($4)
bne $5, 2b
br $fixup_stack_ret
.end _dl_start_user .end _dl_start_user
.set noat .set noat
.previous"); .previous");
#ifndef RTLD_START_SPECIAL_INIT
#define RTLD_START_SPECIAL_INIT /* nothing */
#endif
/* Nonzero iff TYPE describes relocation of a PLT entry, so /* Nonzero iff TYPE describes relocation of a PLT entry, so
PLT entries should not be allowed to define the value. */ PLT entries should not be allowed to define the value. */
#define elf_machine_lookup_noplt_p(type) ((type) == R_ALPHA_JMP_SLOT) #define elf_machine_lookup_noplt_p(type) ((type) == R_ALPHA_JMP_SLOT)
@ -350,7 +377,7 @@ elf_machine_fixup_plt(struct link_map *l, const Elf64_Rela *reloc,
/* Recover the PLT entry address by calculating reloc's index into the /* Recover the PLT entry address by calculating reloc's index into the
.rela.plt, and finding that entry in the .plt. */ .rela.plt, and finding that entry in the .plt. */
rela_plt = (void *) D_PTR (l, l_info[DT_JMPREL]); rela_plt = (void *) D_PTR (l, l_info[DT_JMPREL]);
plte = (void *) (D_PTR (l, [DT_PLTGOT]) + 32); plte = (void *) (D_PTR (l, l_info[DT_PLTGOT]) + 32);
plte += 3 * (reloc - rela_plt); plte += 3 * (reloc - rela_plt);
/* Find the displacement from the plt entry to the function. */ /* Find the displacement from the plt entry to the function. */