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| author | Nikolay Borisov <Nikolay.Borisov@arm.com> | 2014-05-08 16:54:26 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-05-26 00:44:26 +0200 |
| commit | 8203d5b628907ae6141e4eb52f9b48e0f1f46cd2 (patch) | |
| tree | 8b635436986e4036ace52cb30299eac7b7bfe70f /arch | |
| parent | ARM: 8051/1: put_user: fix possible data corruption in put_user (diff) | |
| download | linux-8203d5b628907ae6141e4eb52f9b48e0f1f46cd2.tar.xz linux-8203d5b628907ae6141e4eb52f9b48e0f1f46cd2.zip | |
ARM: 8052/1: unwind: Fix handling of "Pop r4-r[4+nnn],r14" opcode
The arm EABI states that unwind opcode 10100nnn means pop register r4-4[4+nnn],aditionally there is a similar unwind opcode: 10101nnn which means the same thing plus popping r14. Those two cases are handled by the unwind_exec_pop_r4_to_rN function which checks whether the 4th bit is set and does r14 popping.
However, up until now it has been checking whether the 8th bit was set (mask & 0x80) instead of the 4th (mask & 0x8), a simple to make typo but this meant that we were always popping r14 even if we had the former opcode.
This patch changes the mask so that the 2 unwind opcodes are being handled correctly.
Signed-off-by: Nikolay Borisov <Nikolay.Borisov@arm.com>
Reviewed-by: Anurag Aggarwal <anurag19aggarwal@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/kernel/unwind.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c index 3c217694ebec..cb791ac6a003 100644 --- a/arch/arm/kernel/unwind.c +++ b/arch/arm/kernel/unwind.c @@ -285,7 +285,7 @@ static int unwind_exec_pop_r4_to_rN(struct unwind_ctrl_block *ctrl, if (unwind_pop_register(ctrl, &vsp, reg)) return -URC_FAILURE; - if (insn & 0x80) + if (insn & 0x8) if (unwind_pop_register(ctrl, &vsp, 14)) return -URC_FAILURE; |