toolchain/musl/patches/800-mips_pie_debug.patch

   1 Fix DT_DEBUG handling on MIPS in musl libc.
   2 With this change gdb will load the symbol files for shared libraries on MIPS too.
   3
   4 This patch was taken from this thread: https://www.openwall.com/lists/musl/2022/01/09/4
   5
   6 --- a/arch/mips/reloc.h
   7 +++ b/arch/mips/reloc.h
   8 @@ -29,6 +29,7 @@
   9
  10  #define NEED_MIPS_GOT_RELOCS 1
  11  #define DT_DEBUG_INDIRECT DT_MIPS_RLD_MAP
  12 +#define DT_DEBUG_INDIRECT_REL DT_MIPS_RLD_MAP_REL
  13  #define ARCH_SYM_REJECT_UND(s) (!((s)->st_other & STO_MIPS_PLT))
  14
  15  #define CRTJMP(pc,sp) __asm__ __volatile__( \
  16 --- a/arch/mips64/reloc.h
  17 +++ b/arch/mips64/reloc.h
  18 @@ -38,6 +38,7 @@
  19
  20  #define NEED_MIPS_GOT_RELOCS 1
  21  #define DT_DEBUG_INDIRECT DT_MIPS_RLD_MAP
  22 +#define DT_DEBUG_INDIRECT_REL DT_MIPS_RLD_MAP_REL
  23  #define ARCH_SYM_REJECT_UND(s) (!((s)->st_other & STO_MIPS_PLT))
  24
  25  #define CRTJMP(pc,sp) __asm__ __volatile__( \
  26 --- a/arch/mipsn32/reloc.h
  27 +++ b/arch/mipsn32/reloc.h
  28 @@ -29,6 +29,7 @@
  29
  30  #define NEED_MIPS_GOT_RELOCS 1
  31  #define DT_DEBUG_INDIRECT DT_MIPS_RLD_MAP
  32 +#define DT_DEBUG_INDIRECT_REL DT_MIPS_RLD_MAP_REL
  33  #define ARCH_SYM_REJECT_UND(s) (!((s)->st_other & STO_MIPS_PLT))
  34
  35  #define CRTJMP(pc,sp) __asm__ __volatile__( \
  36 --- a/ldso/dynlink.c
  37 +++ b/ldso/dynlink.c
  38 @@ -1923,6 +1923,10 @@ void __dls3(size_t *sp, size_t *auxv)
  39                         size_t *ptr = (size_t *) app.dynv[i+1];
  40                         *ptr = (size_t)&debug;
  41                 }
  42 +               if (app.dynv[i]==DT_DEBUG_INDIRECT_REL) {
  43 +                       size_t *ptr = (size_t *)((size_t)&app.dynv[i] + app.dynv[i+1]);
  44 +                       *ptr = (size_t)&debug;
  45 +               }
  46         }
  47
  48         /* This must be done before final relocations, since it calls
  49 --- a/src/internal/dynlink.h
  50 +++ b/src/internal/dynlink.h
  51 @@ -92,6 +92,10 @@ struct fdpic_dummy_loadmap {
  52  #define DT_DEBUG_INDIRECT 0
  53  #endif
  54
  55 +#ifndef DT_DEBUG_INDIRECT_REL
  56 +#define DT_DEBUG_INDIRECT_REL 0
  57 +#endif
  58 +
  59  #define AUX_CNT 32
  60  #define DYN_CNT 32
  61