From: Michael Schmitz <schmitzmic@gmail.com>
To: linux-m68k@vger.kernel.org, geert@linux-m68k.org
Cc: glaubitz@physik.fu-berlin.de, schwab@linux-m68k.org,
Michael Schmitz <schmitzmic@gmail.com>
Subject: [PATCH v7 1/2] m68k/kernel - wire up syscall_trace_enter/leave for m68k
Date: Tue, 29 Jun 2021 11:55:19 +1200 [thread overview]
Message-ID: <1624924520-17567-2-git-send-email-schmitzmic@gmail.com> (raw)
In-Reply-To: <1624924520-17567-1-git-send-email-schmitzmic@gmail.com>
m68k (other than Coldfire) uses syscall_trace for both trace entry
and trace exit. Seccomp support requires separate entry points for
trace entry and exit which are already provided for Coldfire.
Replace syscall_trace by syscall_trace_enter and syscall_trace_leave
in preparation for seccomp support. Check return code of
syscall_trace_enter(), and skip syscall if -1. Return code will be
left at what had been set by ptrace or seccomp (in regs->d0).
No regression seen in testing with strace on ARAnyM.
Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>
--
Changes from v6:
Geert Uytterhoeven:
- add syscall_trace_enter() return code check for 68000
and coldfire
Changes from v5:
- add comment to explain optimization
Changes from v4:
Andreas Schwab:
- optimize return code test (addql #1,%d0 for cmpil #-1,%d0)
- spelling fix in commit message
Changes from v3:
- change syscall_trace_enter return code test from !=0 to ==-1
---
arch/m68k/68000/entry.S | 2 ++
arch/m68k/coldfire/entry.S | 2 ++
arch/m68k/kernel/entry.S | 8 +++++---
arch/m68k/kernel/ptrace.c | 17 -----------------
4 files changed, 9 insertions(+), 20 deletions(-)
diff --git a/arch/m68k/68000/entry.S b/arch/m68k/68000/entry.S
index 259b366..94abf3d 100644
--- a/arch/m68k/68000/entry.S
+++ b/arch/m68k/68000/entry.S
@@ -47,6 +47,8 @@ do_trace:
jbsr syscall_trace_enter
RESTORE_SWITCH_STACK
addql #4,%sp
+ addql #1,%d0
+ jeq ret_from_exception
movel %sp@(PT_OFF_ORIG_D0),%d1
movel #-ENOSYS,%d0
cmpl #NR_syscalls,%d1
diff --git a/arch/m68k/coldfire/entry.S b/arch/m68k/coldfire/entry.S
index d43a027..f1d41a9 100644
--- a/arch/m68k/coldfire/entry.S
+++ b/arch/m68k/coldfire/entry.S
@@ -92,6 +92,8 @@ ENTRY(system_call)
jbsr syscall_trace_enter
RESTORE_SWITCH_STACK
addql #4,%sp
+ addql #1,%d0
+ jeq ret_from_exception
movel %d3,%a0
jbsr %a0@
movel %d0,%sp@(PT_OFF_D0) /* save the return value */
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index 9dd76fb..d6f941d 100644
--- a/arch/m68k/kernel/entry.S
+++ b/arch/m68k/kernel/entry.S
@@ -164,9 +164,11 @@ do_trace_entry:
movel #-ENOSYS,%sp@(PT_OFF_D0)| needed for strace
subql #4,%sp
SAVE_SWITCH_STACK
- jbsr syscall_trace
+ jbsr syscall_trace_enter
RESTORE_SWITCH_STACK
addql #4,%sp
+ addql #1,%d0 | optimization for cmpil #-1,%d0
+ jeq ret_from_syscall
movel %sp@(PT_OFF_ORIG_D0),%d0
cmpl #NR_syscalls,%d0
jcs syscall
@@ -177,7 +179,7 @@ badsys:
do_trace_exit:
subql #4,%sp
SAVE_SWITCH_STACK
- jbsr syscall_trace
+ jbsr syscall_trace_leave
RESTORE_SWITCH_STACK
addql #4,%sp
jra .Lret_from_exception
@@ -186,7 +188,7 @@ ENTRY(ret_from_signal)
movel %curptr@(TASK_STACK),%a1
tstb %a1@(TINFO_FLAGS+2)
jge 1f
- jbsr syscall_trace
+ jbsr syscall_trace_leave
1: RESTORE_SWITCH_STACK
addql #4,%sp
/* on 68040 complete pending writebacks if any */
diff --git a/arch/m68k/kernel/ptrace.c b/arch/m68k/kernel/ptrace.c
index 94b3b27..74d58a8 100644
--- a/arch/m68k/kernel/ptrace.c
+++ b/arch/m68k/kernel/ptrace.c
@@ -271,22 +271,6 @@ long arch_ptrace(struct task_struct *child, long request,
return -EIO;
}
-asmlinkage void syscall_trace(void)
-{
- ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
- ? 0x80 : 0));
- /*
- * this isn't the same as continuing with a signal, but it will do
- * for normal use. strace only continues with a signal if the
- * stopping signal is not SIGTRAP. -brl
- */
- if (current->exit_code) {
- send_sig(current->exit_code, current, 1);
- current->exit_code = 0;
- }
-}
-
-#if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)
asmlinkage int syscall_trace_enter(void)
{
int ret = 0;
@@ -301,4 +285,3 @@ asmlinkage void syscall_trace_leave(void)
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(task_pt_regs(current), 0);
}
-#endif /* CONFIG_COLDFIRE */
--
2.7.4
next prev parent reply other threads:[~2021-06-28 23:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-28 23:55 [PATCH v7 0/2] Add kernel seccomp support for m68k Michael Schmitz
2021-06-28 23:55 ` Michael Schmitz [this message]
2021-06-28 23:55 ` [PATCH v7 2/2] m68k: add kernel seccomp support Michael Schmitz
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