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ARM: 6340/1: module - additional unwind tables for exit/devexit sections

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Without these, exit functions cannot be stack-traced, so to speak.
This implies that module unloads that perform allocations (don't
laugh) will cause noisy warnings on the console when kmemleak is
enabled, as it presumes that all code's call chains are traceable.
Similarly, BUGs and WARN_ONs will give additional console spam.

Signed-off-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Phil Carmody 2010-08-19 15:19:04 +01:00 committed by Russell King
parent e5f7772eec
commit 09e56a2d07
2 changed files with 10 additions and 0 deletions
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2
arch/arm/include/asm/module.h
View file

@ -17,6 +17,8 @@ enum {
ARM_SEC_INIT, ARM_SEC_INIT,
ARM_SEC_DEVINIT, ARM_SEC_DEVINIT,
ARM_SEC_CORE, ARM_SEC_CORE,
ARM_SEC_EXIT,
ARM_SEC_DEVEXIT,
ARM_SEC_MAX, ARM_SEC_MAX,
}; };
struct mod_arch_specific { struct mod_arch_specific {

8
arch/arm/kernel/module.c
View file

@ -80,12 +80,20 @@ int module_frob_arch_sections(Elf_Ehdr *hdr,
maps[ARM_SEC_DEVINIT].unw_sec = s; maps[ARM_SEC_DEVINIT].unw_sec = s;
else if (strcmp(".ARM.exidx", secname) == 0) else if (strcmp(".ARM.exidx", secname) == 0)
maps[ARM_SEC_CORE].unw_sec = s; maps[ARM_SEC_CORE].unw_sec = s;
else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
maps[ARM_SEC_EXIT].unw_sec = s;
else if (strcmp(".ARM.exidx.devexit.text", secname) == 0)
maps[ARM_SEC_DEVEXIT].unw_sec = s;
else if (strcmp(".init.text", secname) == 0) else if (strcmp(".init.text", secname) == 0)
maps[ARM_SEC_INIT].sec_text = s; maps[ARM_SEC_INIT].sec_text = s;
else if (strcmp(".devinit.text", secname) == 0) else if (strcmp(".devinit.text", secname) == 0)
maps[ARM_SEC_DEVINIT].sec_text = s; maps[ARM_SEC_DEVINIT].sec_text = s;
else if (strcmp(".text", secname) == 0) else if (strcmp(".text", secname) == 0)
maps[ARM_SEC_CORE].sec_text = s; maps[ARM_SEC_CORE].sec_text = s;
else if (strcmp(".exit.text", secname) == 0)
maps[ARM_SEC_EXIT].sec_text = s;
else if (strcmp(".devexit.text", secname) == 0)
maps[ARM_SEC_DEVEXIT].sec_text = s;
} }
#endif #endif
return 0; return 0;