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powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call 

Arch code should use tracehook_*() helpers, as documented in
include/linux/tracehook.h, ptrace_report_syscall() is not expected to
be used outside that file.

The patch does not look very nice, but at least it is correct
and opens the way for PTRACE_GET_SYSCALL_INFO API.

Co-authored-by: Dmitry V. Levin <ldv@altlinux.org>
Fixes: 5521eb4bca ("powerpc/ptrace: Add support for PTRACE_SYSEMU")
Signed-off-by: Elvira Khabirova <lineprinter@altlinux.org>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
[mpe: Take this as a minimal fix for 4.20, we'll rework it later]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
hifive-unleashed-5.1
Elvira Khabirova 2018-12-07 18:56:05 +03:00 committed by Michael Ellerman
parent 9ef34630a4
commit a225f15674
1 changed files with 6 additions and 1 deletions
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7
arch/powerpc/kernel/ptrace.c
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@ -3266,12 +3266,17 @@ long do_syscall_trace_enter(struct pt_regs *regs)
user_exit();
if (test_thread_flag(TIF_SYSCALL_EMU)) {
ptrace_report_syscall(regs);
/*
* A nonzero return code from tracehook_report_syscall_entry()
* tells us to prevent the syscall execution, but we are not
* going to execute it anyway.
*
* Returning -1 will skip the syscall execution. We want to
* avoid clobbering any register also, thus, not 'gotoing'
* skip label.
*/
if (tracehook_report_syscall_entry(regs))
;
return -1;
}