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 @@ -35,6 +35,16 @@ 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) { _
