The patch titled
Subject: powerpc: define syscall_get_error()
has been added to the -mm tree. Its filename is
powerpc-define-syscall_get_error.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/powerpc-define-syscall_get_error.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/powerpc-define-syscall_get_error.patch
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------------------------------------------------------
From: "Dmitry V. Levin" <ldv@xxxxxxxxxxxx>
Subject: powerpc: define syscall_get_error()
syscall_get_error() is required to be implemented on this architecture in
addition to already implemented syscall_get_nr(), syscall_get_arguments(),
syscall_get_return_value(), and syscall_get_arch() functions in order to
extend the generic ptrace API with PTRACE_GET_SYSCALL_INFO request.
Link: http://lkml.kernel.org/r/20190510152824.GE28558@xxxxxxxxxxxx
Signed-off-by: Dmitry V. Levin <ldv@xxxxxxxxxxxx>
Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Elvira Khabirova <lineprinter@xxxxxxxxxxxx>
Cc: Eugene Syromyatnikov <esyr@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Greentime Hu <greentime@xxxxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx> [parisc]
Cc: James E.J. Bottomley <jejb@xxxxxxxxxxxxxxxx>
Cc: James Hogan <jhogan@xxxxxxxxxx>
Cc: kbuild test robot <lkp@xxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Richard Kuo <rkuo@xxxxxxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Vincent Chen <deanbo422@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/include/asm/syscall.h | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/arch/powerpc/include/asm/syscall.h~powerpc-define-syscall_get_error
+++ a/arch/powerpc/include/asm/syscall.h
@@ -38,6 +38,16 @@ static inline void syscall_rollback(stru
regs->gpr[3] = regs->orig_gpr3;
}
+static inline long syscall_get_error(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ /*
+ * If the system call failed,
+ * regs->gpr[3] contains a positive ERRORCODE.
+ */
+ return (regs->ccr & 0x10000000UL) ? -regs->gpr[3] : 0;
+}
+
static inline long syscall_get_return_value(struct task_struct *task,
struct pt_regs *regs)
{
_
Patches currently in -mm which might be from ldv@xxxxxxxxxxxx are
nds32-fix-asm-syscallh.patch
hexagon-define-syscall_get_error-and-syscall_get_return_value.patch
mips-define-syscall_get_error.patch
parisc-define-syscall_get_error.patch
powerpc-define-syscall_get_error.patch
selftests-ptrace-add-a-test-case-for-ptrace_get_syscall_info.patch
