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authorRich Felker <dalias@aerifal.cx>2012-04-25 00:05:42 -0400
committerRich Felker <dalias@aerifal.cx>2012-04-25 00:05:42 -0400
commit3ec8d29c754542c3f4b3d6c07ab6db17213aff17 (patch)
tree0a9ffc0f2c7e611f868205f57a88d6050638cd39 /src
parent60872cf9c93687e771c1b8bc41bb006bdcdc2e45 (diff)
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gdb shared library debugging support
provide the minimal level of dynamic linker-to-debugger glue needed to let gdb find loaded libraries and load their symbols.
Diffstat (limited to 'src')
-rw-r--r--src/ldso/dynlink.c37
1 files changed, 32 insertions, 5 deletions
diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index d04bef62..3f3316aa 100644
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -38,15 +38,24 @@ typedef Elf64_Sym Sym;
#define R_SYM(x) ((x)>>32)
#endif
-struct dso
-{
+struct debug {
+ int ver;
+ void *head;
+ void (*bp)(void);
+ int state;
+ void *base;
+};
+
+struct dso {
+ unsigned char *base;
+ char *name;
+ size_t *dynv;
struct dso *next, *prev;
+
int refcnt;
- size_t *dynv;
Sym *syms;
uint32_t *hashtab;
char *strings;
- unsigned char *base;
unsigned char *map;
size_t map_len;
dev_t dev;
@@ -55,7 +64,6 @@ struct dso
char relocated;
char constructed;
struct dso **deps;
- char *name;
char buf[];
};
@@ -69,6 +77,9 @@ static int ssp_used;
static int runtime;
static jmp_buf rtld_fail;
static pthread_rwlock_t lock;
+static struct debug debug;
+
+struct debug *_dl_debug_addr = &debug;
#define AUX_CNT 24
#define DYN_CNT 34
@@ -500,6 +511,10 @@ static void do_init_fini(struct dso *p)
}
}
+void _dl_debug_state(void)
+{
+}
+
void *__dynlink(int argc, char **argv)
{
size_t *auxv, aux[AUX_CNT] = {0};
@@ -608,6 +623,16 @@ void *__dynlink(int argc, char **argv)
* all memory used by the dynamic linker. */
runtime = 1;
+ for (i=0; app->dynv[i]; i+=2)
+ if (app->dynv[i]==DT_DEBUG)
+ app->dynv[i+1] = (size_t)&debug;
+ debug.ver = 1;
+ debug.bp = _dl_debug_state;
+ debug.head = head;
+ debug.base = lib->base;
+ debug.state = 0;
+ _dl_debug_state();
+
do_init_fini(tail);
if (!rtld_used) {
@@ -678,6 +703,8 @@ void *dlopen(const char *file, int mode)
p->global = 1;
}
+ _dl_debug_state();
+
do_init_fini(tail);
end:
pthread_rwlock_unlock(&lock);