[PATCH v2] ldso: fix GDB dynamic linker info on MIPS

[Felix Fietkau <nbd@openwrt.org>]

GDB is looking for a pointer to the ldso debug info in the data of the
.rld_map section.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
 arch/mips/reloc.h | 1 +
 ldso/dynlink.c    | 9 ++++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/mips/reloc.h b/arch/mips/reloc.h
index 9b40e3d..e9cb209 100644
--- a/arch/mips/reloc.h
+++ b/arch/mips/reloc.h
@@ -25,6 +25,7 @@
 
 #define NEED_MIPS_GOT_RELOCS 1
 #define DYNAMIC_IS_RO 1
+#define DT_DEBUG_INDIRECT DT_MIPS_RLD_MAP
 #define ARCH_SYM_REJECT_UND(s) (!((s)->st_other & STO_MIPS_PLT))
 
 #define CRTJMP(pc,sp) __asm__ __volatile__( \
diff --git a/ldso/dynlink.c b/ldso/dynlink.c
index f497542..948815d 100644
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -1582,11 +1582,18 @@ _Noreturn void __dls3(size_t *sp)
 	load_deps(&app);
 	make_global(&app);
 
+	for (i=0; app.dynv[i]; i+=2) {
 #ifndef DYNAMIC_IS_RO
-	for (i=0; app.dynv[i]; i+=2)
 		if (app.dynv[i]==DT_DEBUG)
 			app.dynv[i+1] = (size_t)&debug;
 #endif
+#ifdef DT_DEBUG_INDIRECT
+		if (app.dynv[i]==DT_DEBUG_INDIRECT) {
+			size_t *ptr = (size_t *) app.dynv[i+1];
+			*ptr = (size_t)&debug;
+		}
+#endif
+	}
 
 	/* The main program must be relocated LAST since it may contin
 	 * copy relocations which depend on libraries' relocations. */
-- 
2.2.2