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[PATCH] x86_64: reliable stack trace support

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These are the generic bits needed to enable reliable stack traces based
on Dwarf2-like (.eh_frame) unwind information. Subsequent patches will
enable x86-64 and i386 to make use of this.

Thanks to Andi Kleen and Ingo Molnar, who pointed out several possibilities
for improvement.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jan Beulich 2006-06-26 13:57:28 +02:00 • committed by Linus Torvalds
parent 2b28592b07
commit 4552d5dc08
8 changed files with 1072 additions and 3 deletions
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16
kernel/module.c
View file

@ -40,6 +40,7 @@
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/mutex.h>
#include <linux/unwind.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <asm/cacheflush.h>
@ -1051,6 +1052,8 @@ static void free_module(struct module *mod)
remove_sect_attrs(mod);
mod_kobject_remove(mod);
unwind_remove_table(mod->unwind_info, 0);
/* Arch-specific cleanup. */
module_arch_cleanup(mod);
@ -1412,7 +1415,7 @@ static struct module *load_module(void __user *umod,
unsigned int i, symindex = 0, strindex = 0, setupindex, exindex,
exportindex, modindex, obsparmindex, infoindex, gplindex,
crcindex, gplcrcindex, versindex, pcpuindex, gplfutureindex,
gplfuturecrcindex;
gplfuturecrcindex, unwindex = 0;
struct module *mod;
long err = 0;
void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
@ -1502,6 +1505,9 @@ static struct module *load_module(void __user *umod,
versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
#ifdef ARCH_UNWIND_SECTION_NAME
unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
#endif
/* Don't keep modinfo section */
sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
@ -1510,6 +1516,8 @@ static struct module *load_module(void __user *umod,
sechdrs[symindex].sh_flags |= SHF_ALLOC;
sechdrs[strindex].sh_flags |= SHF_ALLOC;
#endif
if (unwindex)
sechdrs[unwindex].sh_flags |= SHF_ALLOC;
/* Check module struct version now, before we try to use module. */
if (!check_modstruct_version(sechdrs, versindex, mod)) {
@ -1738,6 +1746,11 @@ static struct module *load_module(void __user *umod,
goto arch_cleanup;
add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
/* Size of section 0 is 0, so this works well if no unwind info. */
mod->unwind_info = unwind_add_table(mod,
(void *)sechdrs[unwindex].sh_addr,
sechdrs[unwindex].sh_size);
/* Get rid of temporary copy */
vfree(hdr);
@ -1836,6 +1849,7 @@ sys_init_module(void __user *umod,
mod->state = MODULE_STATE_LIVE;
/* Drop initial reference. */
module_put(mod);
unwind_remove_table(mod->unwind_info, 1);
module_free(mod, mod->module_init);
mod->module_init = NULL;
mod->init_size = 0;