When any backtraced function has saved the caller register r10
(e.g., show_mem), without the fix in c_backtrace all saved caller
registers of the function will not been dumped.
Signed-off-by: Tao Hou <hotfor...@gmail.com>
Cc: linux-arm-ker...@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
arch/arm/lib/backtrace.S | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/arm/lib/backtrace.S b/arch/arm/lib/backtrace.S
index cd07b58..b4ecdd5 100644
--- a/arch/arm/lib/backtrace.S
+++ b/arch/arm/lib/backtrace.S
@@ -69,7 +69,7 @@ for_each_frame: tst frame, mask @ Check
for address exceptions
1003: ldr r2, [sv_pc, #-4] @ if stmfd sp!, {args} exists,
ldr r3, .Ldsi+4 @ adjust saved 'pc' back one
- teq r3, r2, lsr #10 @ instruction
+ teq r3, r2, lsr #11 @ instruction
subne r0, sv_pc, #4 @ allow for mov
subeq r0, sv_pc, #8 @ allow for mov + stmia
@@ -80,14 +80,14 @@ for_each_frame: tst frame, mask @ Check
for address exceptions
ldr r1, [sv_pc, #-4] @ if stmfd sp!, {args} exists,
ldr r3, .Ldsi+4
- teq r3, r1, lsr #10
+ teq r3, r1, lsr #11
ldreq r0, [frame, #-8] @ get sp
subeq r0, r0, #4 @ point at the last arg
bleq .Ldumpstm @ dump saved registers
1004: ldr r1, [sv_pc, #0] @ if stmfd sp!, {..., fp, ip,
lr, pc}
ldr r3, .Ldsi @ instruction exists,
- teq r3, r1, lsr #10
+ teq r3, r1, lsr #11
subeq r0, frame, #16
bleq .Ldumpstm @ dump saved registers
@@ -146,7 +146,7 @@ ENDPROC(c_backtrace)
.Lcr: .asciz "\n"
.Lbad: .asciz "Backtrace aborted due to bad frame pointer <%p>\n"
.align
-.Ldsi: .word 0xe92dd800 >> 10 @ stmfd sp!, {... fp, ip, lr,
pc}
- .word 0xe92d0000 >> 10 @ stmfd sp!, {}
+.Ldsi: .word 0xe92dd800 >> 11 @ stmfd sp!, {... fp, ip, lr,
pc}
+ .word 0xe92d0000 >> 11 @ stmfd sp!, {}
#endif
--
1.7.9.5
--
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