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ARM: 8022/1: ftrace: work with CONFIG_DEBUG_SET_MODULE_RONX 

Make ftrace work with CONFIG_DEBUG_SET_MODULE_RONX by making module text
writable around the place where ftrace does its work, like it is done on
x86 in the patch which introduced CONFIG_DEBUG_SET_MODULE_RONX,
84e1c6bb38 ("x86: Add RO/NX protection for loadable kernel modules").

Tested-by: Mitchel Humpherys <mitchelh@codeaurora.org>
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Rabin Vincent 2014-04-03 18:46:45 +01:00 committed by Russell King
parent 603fb42a66
commit a672917ab8
1 changed files with 13 additions and 0 deletions
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13
arch/arm/kernel/ftrace.c
View File

@ -14,6 +14,7 @@
#include <linux/ftrace.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <asm/cacheflush.h>
#include <asm/opcodes.h>
@ -63,6 +64,18 @@ static unsigned long adjust_address(struct dyn_ftrace *rec, unsigned long addr)
}
#endif
int ftrace_arch_code_modify_prepare(void)
{
set_all_modules_text_rw();
return 0;
}
int ftrace_arch_code_modify_post_process(void)
{
set_all_modules_text_ro();
return 0;
}
static unsigned long ftrace_call_replace(unsigned long pc, unsigned long addr)
{
return arm_gen_branch_link(pc, addr);