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powerpc: Reverse stack frame marker on little endian
author
Michael Ellerman
<mpe@ellerman.id.au>
Tue, 27 Sep 2022 15:04:19 +0000
(
01:04
+1000)
committer
Michael Ellerman
<mpe@ellerman.id.au>
Wed, 28 Sep 2022 12:21:17 +0000
(22:21 +1000)
On little endian the stack frame marker appears reversed when dumping
memory sequentially, as is typical in xmon or gdb, eg:
c000000004733e40
0000000000000000
0000000000000000
|................|
c000000004733e50
0000000000000000
0000000000000000
|................|
c000000004733e60
0000000000000000
0000000000000000
|................|
c000000004733e70
5347455200000000
0000000000000000
|SGER............|
c000000004733e80
a700000000000000
708897f7ff7f0000
|........p.......|
c000000004733e90
0073428fff7f0000
208997f7ff7f0000
|.sB..... .......|
c000000004733ea0
0100000000000000
ffffffffffffffff
|................|
c000000004733eb0
0000000000000000
0000000000000000
|................|
To make it easier to recognise, reverse the value on little endian, so
it always appears as "REGS", eg:
c000000004733e70
5245475300000000
0000000000000000
|REGS............|
Acked-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link:
https://lore.kernel.org/r/20220927150419.1503001-2-mpe@ellerman.id.au
arch/powerpc/include/asm/ptrace.h
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diff --git
a/arch/powerpc/include/asm/ptrace.h
b/arch/powerpc/include/asm/ptrace.h
index
6c23d1d
..
2efec6d
100644
(file)
--- a/
arch/powerpc/include/asm/ptrace.h
+++ b/
arch/powerpc/include/asm/ptrace.h
@@
-99,7
+99,12
@@
struct pt_regs
#define STACK_FRAME_WITH_PT_REGS (STACK_FRAME_OVERHEAD + sizeof(struct pt_regs))
+// Always displays as "REGS" in memory dumps
+#ifdef CONFIG_CPU_BIG_ENDIAN
#define STACK_FRAME_REGS_MARKER ASM_CONST(0x52454753)
+#else
+#define STACK_FRAME_REGS_MARKER ASM_CONST(0x53474552)
+#endif
#ifdef __powerpc64__