[PATCH 5/6] arm64: add PTRACE_SYSEMU{, SINGLESTEP} definations to uapi headers

Sudeep Holla sudeep.holla at arm.com
Fri Mar 1 05:32:19 AEDT 2019

x86 and um use 31 and 32 for PTRACE_SYSEMU and PTRACE_SYSEMU_SINGLESTEP
while powerpc uses different value maybe for legacy reasons.

Though handling of PTRACE_SYSEMU can be made architecture independent,
it's hard to make these definations generic. To add to this existing
mess few architectures like arm, c6x and sh use 31 for PTRACE_GETFDPIC
(get the ELF fdpic loadmap address). It's not possible to move the
definations to generic headers.

So we unfortunately have to duplicate the same defination to ARM64 if
we need to support PTRACE_SYSEMU.

Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will.deacon at arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla at arm.com>
 arch/arm64/include/uapi/asm/ptrace.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/include/uapi/asm/ptrace.h b/arch/arm64/include/uapi/asm/ptrace.h
index 28d77c9ed531..8478b9007f9e 100644
--- a/arch/arm64/include/uapi/asm/ptrace.h
+++ b/arch/arm64/include/uapi/asm/ptrace.h
@@ -62,6 +62,9 @@
 #define PSR_x		0x0000ff00	/* Extension		*/
 #define PSR_c		0x000000ff	/* Control		*/
+/* syscall emulation path in ptrace */
+#define PTRACE_SYSEMU		  31
 #ifndef __ASSEMBLY__

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