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toolchain: musl: Fix symbol loading in gdb 

Fix DT_DEBUG handling on MIPS in musl libc.
With this change gdb will load the symbol files for shared libraries on MIPS too.

This patch was taken from this thread: https://www.openwall.com/lists/musl/2022/01/09/4

Signed-off-by: Hauke Mehrtens <hmehrtens@maxlinear.com>
This commit is contained in:
Hauke Mehrtens 2023-01-10 19:50:12 +01:00 committed by Hauke Mehrtens
parent 6a3816efb7
commit fcdd407e8e
1 changed files with 61 additions and 0 deletions
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61
toolchain/musl/patches/800-mips_pie_debug.patch Normal file
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@ -0,0 +1,61 @@
Fix DT_DEBUG handling on MIPS in musl libc.
With this change gdb will load the symbol files for shared libraries on MIPS too.
This patch was taken from this thread: https://www.openwall.com/lists/musl/2022/01/09/4
--- a/arch/mips/reloc.h
+++ b/arch/mips/reloc.h
@@ -29,6 +29,7 @@
#define NEED_MIPS_GOT_RELOCS 1
#define DT_DEBUG_INDIRECT DT_MIPS_RLD_MAP
+#define DT_DEBUG_INDIRECT_REL DT_MIPS_RLD_MAP_REL
#define ARCH_SYM_REJECT_UND(s) (!((s)->st_other & STO_MIPS_PLT))
#define CRTJMP(pc,sp) __asm__ __volatile__( \
--- a/arch/mips64/reloc.h
+++ b/arch/mips64/reloc.h
@@ -38,6 +38,7 @@
#define NEED_MIPS_GOT_RELOCS 1
#define DT_DEBUG_INDIRECT DT_MIPS_RLD_MAP
+#define DT_DEBUG_INDIRECT_REL DT_MIPS_RLD_MAP_REL
#define ARCH_SYM_REJECT_UND(s) (!((s)->st_other & STO_MIPS_PLT))
#define CRTJMP(pc,sp) __asm__ __volatile__( \
--- a/arch/mipsn32/reloc.h
+++ b/arch/mipsn32/reloc.h
@@ -29,6 +29,7 @@
#define NEED_MIPS_GOT_RELOCS 1
#define DT_DEBUG_INDIRECT DT_MIPS_RLD_MAP
+#define DT_DEBUG_INDIRECT_REL DT_MIPS_RLD_MAP_REL
#define ARCH_SYM_REJECT_UND(s) (!((s)->st_other & STO_MIPS_PLT))
#define CRTJMP(pc,sp) __asm__ __volatile__( \
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -1923,6 +1923,10 @@ void __dls3(size_t *sp, size_t *auxv)
size_t *ptr = (size_t *) app.dynv[i+1];
*ptr = (size_t)&debug;
}
+ if (app.dynv[i]==DT_DEBUG_INDIRECT_REL) {
+ size_t *ptr = (size_t *)((size_t)&app.dynv[i] + app.dynv[i+1]);
+ *ptr = (size_t)&debug;
+ }
}
/* This must be done before final relocations, since it calls
--- a/src/internal/dynlink.h
+++ b/src/internal/dynlink.h
@@ -92,6 +92,10 @@ struct fdpic_dummy_loadmap {
#define DT_DEBUG_INDIRECT 0
#endif
+#ifndef DT_DEBUG_INDIRECT_REL
+#define DT_DEBUG_INDIRECT_REL 0
+#endif
+
#define AUX_CNT 32
#define DYN_CNT 32