diff options
| author | Rabin Vincent <rabin@rab.in> | 2012-02-18 17:47:03 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-03-24 10:38:54 +0100 |
| commit | 4394e2824c8d97d81a336edb469b13c8806604e4 (patch) | |
| tree | 68ec90a882dc2df804a4d6e4e5521ad8ebe7743b /arch/arm/kernel/ftrace.c | |
| parent | ARM: 7351/1: ftrace: remove useless memory checks (diff) | |
| download | linux-4394e2824c8d97d81a336edb469b13c8806604e4.tar.xz linux-4394e2824c8d97d81a336edb469b13c8806604e4.zip | |
ARM: 7330/1: ftrace: use canonical Thumb-2 wide instruction format
As commit 592201a9f15 (ARM: Thumb-2: Support Thumb-2 in undefined
instruction handler) says:
32-bit Thumb instructions are specified in the form:
((first_half << 16 ) | second_half)
which matches the layout used by the ARM ARM.
Convert the ftrace code to use the same format to avoid the usage of
different formats in kernel code.
Acked-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/ftrace.c')
| -rw-r--r-- | arch/arm/kernel/ftrace.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c index 6fd7c4a1e532..5c9cecfaeb21 100644 --- a/arch/arm/kernel/ftrace.c +++ b/arch/arm/kernel/ftrace.c @@ -16,10 +16,11 @@ #include <linux/uaccess.h> #include <asm/cacheflush.h> +#include <asm/opcodes.h> #include <asm/ftrace.h> #ifdef CONFIG_THUMB2_KERNEL -#define NOP 0xeb04f85d /* pop.w {lr} */ +#define NOP 0xf85deb04 /* pop.w {lr} */ #else #define NOP 0xe8bd4000 /* pop {lr} */ #endif @@ -88,7 +89,7 @@ static unsigned long ftrace_gen_branch(unsigned long pc, unsigned long addr, if (link) second |= 1 << 14; - return (second << 16) | first; + return __opcode_thumb32_compose(first, second); } #else static unsigned long ftrace_gen_branch(unsigned long pc, unsigned long addr, @@ -125,6 +126,14 @@ static int ftrace_modify_code(unsigned long pc, unsigned long old, { unsigned long replaced; + if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) { + old = __opcode_to_mem_thumb32(old); + new = __opcode_to_mem_thumb32(new); + } else { + old = __opcode_to_mem_arm(old); + new = __opcode_to_mem_arm(new); + } + if (validate) { if (probe_kernel_read(&replaced, (void *)pc, MCOUNT_INSN_SIZE)) return -EFAULT; |