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| author | Will Deacon <will.deacon@arm.com> | 2012-07-19 20:49:22 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-07-28 14:11:53 +0400 |
| commit | c7aa00db074e4961b49277d7d0fc2f5367d914ca (patch) | |
| tree | c8c511d3f07ad7dc53cf5ca2b326ba0c4c352cea /arch/arm/kernel/entry-common.S | |
| parent | 6628521784d1da3b7354c6b6e8499e19ab46a3d1 (diff) | |
| download | linux-c7aa00db074e4961b49277d7d0fc2f5367d914ca.tar.xz | |
ARM: 7475/1: sys_trace: allow all syscall arguments to be updated via ptrace
Prior to syscall invocation, __sys_trace only reloads r0-r3 from the
kernel stack, preventing the debugger from updating arguments 5-7 when
signalled via ptrace.
This patch updates the code to reload r0-r6, updating arguments 5 and 6
on the stack (argument 7 is only used by OABI indirect syscalls and
can remain in a register).
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/entry-common.S')
| -rw-r--r-- | arch/arm/kernel/entry-common.S | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index 2909bbcaa0d1..978eac57e04a 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -443,7 +443,8 @@ __sys_trace: mov scno, r0 @ syscall number (possibly new) add r1, sp, #S_R0 + S_OFF @ pointer to regs cmp scno, #NR_syscalls @ check upper syscall limit - ldmccia r1, {r0 - r3} @ have to reload r0 - r3 + ldmccia r1, {r0 - r6} @ have to reload r0 - r6 + stmccia sp, {r4, r5} @ and update the stack args ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine b 2b |