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Add support for DT_MIPS_RLD_MAP_REL.

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This tag allows debugging of MIPS position independent executables
and provides access to shared library information.

	* elf/elf.h (DT_MIPS_RLD_MAP_REL): New macro.
	(DT_MIPS_NUM): Update.
	* sysdeps/mips/dl-machine.h (ELF_MACHINE_DEBUG_SETUP): Handle
	DT_MIPS_RLD_MAP_REL.
This commit is contained in:
Matthew Fortune 2015-06-11 10:43:48 +01:00
parent a8e2112ae3
commit a2057c984e
3 changed files with 22 additions and 4 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2015-06-26 Matthew Fortune <matthew.fortune@imgtec.com>
* elf/elf.h (DT_MIPS_RLD_MAP_REL): New macro.
(DT_MIPS_NUM): Update.
* sysdeps/mips/dl-machine.h (ELF_MACHINE_DEBUG_SETUP): Handle
DT_MIPS_RLD_MAP_REL.
2015-06-25 Joseph Myers <joseph@codesourcery.com>
[BZ #16559]

6
elf/elf.h
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@ -1727,7 +1727,11 @@ typedef struct
PLT is writable. For a non-writable PLT, this is omitted or has a zero
value. */
#define DT_MIPS_RWPLT 0x70000034
#define DT_MIPS_NUM 0x35
/* An alternative description of the classic MIPS RLD_MAP that is usable
in a PIE as it stores a relative offset from the address of the tag
rather than an absolute address. */
#define DT_MIPS_RLD_MAP_REL 0x70000035
#define DT_MIPS_NUM 0x36
/* Legal values for DT_MIPS_FLAGS Elf32_Dyn entry. */

13
sysdeps/mips/dl-machine.h
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@ -68,10 +68,17 @@
in l_info array. */
#define DT_MIPS(x) (DT_MIPS_##x - DT_LOPROC + DT_NUM)
/* If there is a DT_MIPS_RLD_MAP entry in the dynamic section, fill it in
with the run-time address of the r_debug structure */
/* If there is a DT_MIPS_RLD_MAP_REL or DT_MIPS_RLD_MAP entry in the dynamic
section, fill in the debug map pointer with the run-time address of the
r_debug structure. */
#define ELF_MACHINE_DEBUG_SETUP(l,r) \
do { if ((l)->l_info[DT_MIPS (RLD_MAP)]) \
do { if ((l)->l_info[DT_MIPS (RLD_MAP_REL)]) \
{ \
char *ptr = (char *)(l)->l_info[DT_MIPS (RLD_MAP_REL)]; \
ptr += (l)->l_info[DT_MIPS (RLD_MAP_REL)]->d_un.d_val; \
*(ElfW(Addr) *)ptr = (ElfW(Addr)) (r); \
} \
else if ((l)->l_info[DT_MIPS (RLD_MAP)]) \
*(ElfW(Addr) *)((l)->l_info[DT_MIPS (RLD_MAP)]->d_un.d_ptr) = \
(ElfW(Addr)) (r); \
} while (0)