ARC: gdbserver using regset interface possibly broken
ptrace regset interface relies on ELF_NGREG for ceiling the size of user
request. So any larger request (even if legit) would be clipped.
The existing def of ELF_NGREG didn't use user_regs_struct and was
technically one placeholder short (stop_pc) - although the current code
would still work because pt_regs includes a bunch of extra fields,
making
ELF_NGREG >= sizeof(struct user_regs_struct)/sizeof(long)
But we need to remove this ambiguity, specially since pt_regs should NOT
be directly associated with with anything userspace-ish.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
diff --git a/arch/arc/include/asm/elf.h b/arch/arc/include/asm/elf.h
index 147284f..4d42005 100644
--- a/arch/arc/include/asm/elf.h
+++ b/arch/arc/include/asm/elf.h
@@ -27,11 +27,7 @@
typedef unsigned long elf_greg_t;
typedef unsigned long elf_fpregset_t;
-
-/* core dump regs is in the order pt_regs, callee_regs, stop_pc (for gdb) */
-#define ELF_NGREG ((sizeof(struct pt_regs) + sizeof(struct callee_regs) \
- + sizeof(unsigned long)) / sizeof(elf_greg_t))
-
+#define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))
typedef elf_greg_t elf_gregset_t[ELF_NGREG];
/*