this is mainly in hopes of supporting c++ (not yet possible for other
reasons) but will also help applications/libraries which use (and more
often, abuse) the gcc __attribute__((__constructor__)) feature in "C"
code.
x86_64 and arm versions of the new startup asm are untested and may
have minor problems.
+.weak _init
+.weak _fini
.global _start
_start:
mov fp,#0
mov lr,#0
ldr a2,[sp],#4
mov a3,sp
.global _start
_start:
mov fp,#0
mov lr,#0
ldr a2,[sp],#4
mov a3,sp
str fp,[sp,#-4]!
str a1,[sp,#-4]!
str fp,[sp,#-4]!
str a1,[sp,#-4]!
+ str a4,[sp,#-4]!
+ ldr a4,=_init
ldr a1,=main
bl __libc_start_main
1: b 1b
ldr a1,=main
bl __libc_start_main
1: b 1b
--- /dev/null
+.section .init
+.global _init
+_init:
+
+.section .fini
+.global _fini
+_fini:
--- /dev/null
+.section .init
+ tst lr,#1
+ moveq pc,lr
+ bx lr
+
+.section .fini
+ tst lr,#1
+ moveq pc,lr
+ bx lr
+.weak _init
+.weak _fini
.text
.global _start
_start:
.text
.global _start
_start:
pushl %esp
pushl %esp
pushl %edx
pushl %esp
pushl %esp
pushl %edx
- pushl %ebp
- pushl %ebp
+ call 1f
+1: addl $[_fini-.],(%esp)
+ call 1f
+1: addl $[_init-.],(%esp)
pushl %eax
pushl %ecx
call 1f
pushl %eax
pushl %ecx
call 1f
--- /dev/null
+.section .init
+.global _init
+_init:
+
+.section .fini
+.global _fini
+_fini:
--- /dev/null
+.section .init
+ ret
+
+.section .fini
+ ret
/* Written 2011 Nicholas J. Kain, released as Public Domain */
/* Written 2011 Nicholas J. Kain, released as Public Domain */
+.weak _init
+.weak _fini
.text
.global _start
_start:
.text
.global _start
_start:
andq $-16,%rsp /* align stack pointer */
push %rax /* 8th arg: glibc ABI compatible */
push %rsp /* 7th arg: glibc ABI compatible */
andq $-16,%rsp /* align stack pointer */
push %rax /* 8th arg: glibc ABI compatible */
push %rsp /* 7th arg: glibc ABI compatible */
- xor %r8,%r8 /* 5th arg: always 0 */
- xor %rcx,%rcx /* 4th arg: always 0 */
+ mov $_fini,%r8 /* 5th arg: fini/dtors function */
+ mov $_init,%rcx /* 4th arg: init/ctors function */
mov $main,%rdi /* 1st arg: application entry ip */
call __libc_start_main /* musl init will run the program */
mov $main,%rdi /* 1st arg: application entry ip */
call __libc_start_main /* musl init will run the program */
--- /dev/null
+.section .init
+.global _init
+_init:
+
+.section .fini
+.global _fini
+_fini:
--- /dev/null
+.section .init
+ ret
+
+.section .fini
+ ret
ino_t ino;
int global;
int relocated;
ino_t ino;
int global;
int relocated;
struct dso **deps;
char *name;
char buf[];
struct dso **deps;
char *name;
char buf[];
+static void do_init_fini(struct dso *p)
+{
+ size_t dyn[DYN_CNT] = {0};
+ for (; p; p=p->prev) {
+ if (p->constructed) return;
+ decode_vec(p->dynv, dyn, DYN_CNT);
+ if (dyn[0] & (1<<DT_FINI))
+ atexit((void (*)(void))(p->base + dyn[DT_FINI]));
+ if (dyn[0] & (1<<DT_INIT))
+ ((void (*)(void))(p->base + dyn[DT_INIT]))();
+ p->constructed = 1;
+ }
+}
+
void *__dynlink(int argc, char **argv)
{
size_t *auxv, aux[AUX_CNT] = {0};
void *__dynlink(int argc, char **argv)
{
size_t *auxv, aux[AUX_CNT] = {0};
}
app->name = argv[0];
app->global = 1;
}
app->name = argv[0];
app->global = 1;
app->dynv = (void *)(app->base + find_dyn(
(void *)aux[AT_PHDR], aux[AT_PHNUM], aux[AT_PHENT]));
decode_dyn(app);
app->dynv = (void *)(app->base + find_dyn(
(void *)aux[AT_PHDR], aux[AT_PHNUM], aux[AT_PHENT]));
decode_dyn(app);
* error. If the dynamic loader (dlopen) will not be used, free
* all memory used by the dynamic linker. */
runtime = 1;
* error. If the dynamic loader (dlopen) will not be used, free
* all memory used by the dynamic linker. */
runtime = 1;
+
+ do_init_fini(tail);
+
if (!rtld_used) {
free_all(head);
free(sys_path);
if (!rtld_used) {
free_all(head);
free(sys_path);