objdump/elf: Add support for GNU segments - scc - simple c99 compiler
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---
(DIR) commit 7b4fef3358a0397fe10577d0b0ce55399953ab7d
(DIR) parent 9b488b2b643bb7e0cd9a8de14223184f74582c16
(HTM) Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date: Mon, 17 Feb 2025 20:37:48 +0100
objdump/elf: Add support for GNU segments
Diffstat:
M include/bits/scc/elf/elfphdr.h | 5 +++++
M src/cmd/scc-objdump/elf.c | 26 +++++++++++++++++++++++---
2 files changed, 28 insertions(+), 3 deletions(-)
---
(DIR) diff --git a/include/bits/scc/elf/elfphdr.h b/include/bits/scc/elf/elfphdr.h
@@ -14,6 +14,11 @@
#define PT_LOPROC 0x70000000 /* reserved range for processor */
#define PT_HIPROC 0x7fffffff /* specific segment types */
+#define PT_GNU_EH_FRAME (PT_LOOS + 0x474e550) /* Frame unwind information */
+#define PT_GNU_STACK (PT_LOOS + 0x474e551) /* Stack flags */
+#define PT_GNU_RELRO (PT_LOOS + 0x474e552) /* Read-only after relocation */
+#define PT_GNU_PROPERTY (PT_LOOS + 0x474e553) /* GNU property */
+
#define PF_X 1 /* Executable */
#define PF_W 2 /* Writable */
#define PF_R 4 /* Readable */
(DIR) diff --git a/src/cmd/scc-objdump/elf.c b/src/cmd/scc-objdump/elf.c
@@ -657,7 +657,7 @@ printphdr(Elfphdr *phdr, unsigned long n)
[PT_LOAD] = "loadable segment",
[PT_DYNAMIC] = "dynamic linking section",
[PT_INTERP] = "the RTLD",
- [PT_NOTE] = "auxiliary information",
+ [PT_NOTE] = "note information",
[PT_SHLIB] = "reserved - purpose undefined",
[PT_PHDR] = "program header",
[PT_TLS] = "thread local storage",
@@ -675,9 +675,29 @@ printphdr(Elfphdr *phdr, unsigned long n)
unsigned long type;
char *stype;
- type = phdr->type;
- stype = (type <= PT_TLS) ? types[type] : "Unknown";
f.flags = phdr->flags;
+ type = phdr->type;
+ if (type <= PT_TLS) {
+ stype = types[type];
+ } else {
+ switch (type) {
+ case PT_GNU_EH_FRAME:
+ stype = "Frame unwind information";
+ break;
+ case PT_GNU_STACK:
+ stype = "Stack flags";
+ break;
+ case PT_GNU_RELRO:
+ stype = "Read-only after relocation";
+ break;
+ case PT_GNU_PROPERTY:
+ stype = "GNU property";
+ break;
+ default:
+ stype = "Unknown";
+ break;
+ }
+ }
printf("Program header %ld\n"
"\tp_type: %#lx, %s\n"