Merge nuts.ninka.net:/home/davem/src/BK/network-2.5

into nuts.ninka.net:/home/davem/src/BK/net-2.5

2 files changed, 51 insertions, 7 deletions

diff --git a/include/asm-i386/elf.h b/include/asm-i386/elf.h
index 637838d7f85a..a87a45df75e2 100644
--- a/include/asm-i386/elf.h
+++ b/include/asm-i386/elf.h
@@ -101,7 +101,7 @@ typedef struct user_fxsr_struct elf_fpxregset_t;
  * for more of them, start the x86-specific ones at 32.
  */
 #define AT_SYSINFO		32
-#define AT_SYSINFO_EH_FRAME	33
+#define AT_SYSINFO_EHDR		33
 
 #ifdef __KERNEL__
 #define SET_PERSONALITY(ex, ibcs2) set_personality((ibcs2)?PER_SVR4:PER_LINUX)
@@ -119,15 +119,56 @@ extern void dump_smp_unlazy_fpu(void);
 #define ELF_CORE_SYNC dump_smp_unlazy_fpu
 #endif
 
-/* Offset from the beginning of the page where the .eh_frame information
-   for the code in the vsyscall page starts.  */
-#define EH_FRAME_OFFSET 96
+#define VSYSCALL_BASE	(__fix_to_virt(FIX_VSYSCALL))
+#define VSYSCALL_EHDR	((const struct elfhdr *) VSYSCALL_BASE)
+#define VSYSCALL_ENTRY	((unsigned long) &__kernel_vsyscall)
+extern void __kernel_vsyscall;
 
 #define ARCH_DLINFO						\
 do {								\
-		NEW_AUX_ENT(AT_SYSINFO, 0xffffe000);		\
-		NEW_AUX_ENT(AT_SYSINFO_EH_FRAME,		\
-			    0xffffe000 + EH_FRAME_OFFSET);	\
+		NEW_AUX_ENT(AT_SYSINFO,	VSYSCALL_ENTRY);	\
+		NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL_BASE);	\
+} while (0)
+
+/*
+ * These macros parameterize elf_core_dump in fs/binfmt_elf.c to write out
+ * extra segments containing the vsyscall DSO contents.  Dumping its
+ * contents makes post-mortem fully interpretable later without matching up
+ * the same kernel and hardware config to see what PC values meant.
+ * Dumping its extra ELF program headers includes all the other information
+ * a debugger needs to easily find how the vsyscall DSO was being used.
+ */
+#define ELF_CORE_EXTRA_PHDRS		(VSYSCALL_EHDR->e_phnum)
+#define ELF_CORE_WRITE_EXTRA_PHDRS					      \
+do {									      \
+	const struct elf_phdr *const vsyscall_phdrs =			      \
+		(const struct elf_phdr *) (VSYSCALL_BASE		      \
+					   + VSYSCALL_EHDR->e_phoff);	      \
+	int i;								      \
+	Elf32_Off ofs = 0;						      \
+	for (i = 0; i < VSYSCALL_EHDR->e_phnum; ++i) {			      \
+		struct elf_phdr phdr = vsyscall_phdrs[i];		      \
+		if (phdr.p_type == PT_LOAD) {				      \
+			ofs = phdr.p_offset = offset;			      \
+			offset += phdr.p_filesz;			      \
+		}							      \
+		else							      \
+			phdr.p_offset += ofs;				      \
+		phdr.p_paddr = 0; /* match other core phdrs */		      \
+		DUMP_WRITE(&phdr, sizeof(phdr));			      \
+	}								      \
+} while (0)
+#define ELF_CORE_WRITE_EXTRA_DATA					      \
+do {									      \
+	const struct elf_phdr *const vsyscall_phdrs =			      \
+		(const struct elf_phdr *) (VSYSCALL_BASE		      \
+					   + VSYSCALL_EHDR->e_phoff);	      \
+	int i;								      \
+	for (i = 0; i < VSYSCALL_EHDR->e_phnum; ++i) {			      \
+		if (vsyscall_phdrs[i].p_type == PT_LOAD)		      \
+			DUMP_WRITE((void *) vsyscall_phdrs[i].p_vaddr,	      \
+				   vsyscall_phdrs[i].p_filesz);		      \
+	}								      \
 } while (0)
 
 #endif
diff --git a/include/linux/elf.h b/include/linux/elf.h
index 0a7a35e2722b..fb03869f90a8 100644
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -29,8 +29,11 @@ typedef __s64	Elf64_Sxword;
 #define PT_NOTE    4
 #define PT_SHLIB   5
 #define PT_PHDR    6
+#define PT_LOOS	   0x60000000
+#define PT_HIOS	   0x6fffffff
 #define PT_LOPROC  0x70000000
 #define PT_HIPROC  0x7fffffff
+#define PT_GNU_EH_FRAME		0x6474e550
 #define PT_MIPS_REGINFO		0x70000000
 
 /* Flags in the e_flags field of the header */