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Subject[PATCH 1/3] arch/tile: Call tracehook_report_syscall_{entry,exit} in syscall trace
Date
Call tracehook functions for syscall tracing.

The check for TIF_SYSCALL_TRACE was removed, because the same check is
done right before in the assembly file.

Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>
---
arch/tile/kernel/intvec_32.S | 6 ++++--
arch/tile/kernel/intvec_64.S | 6 ++++--
arch/tile/kernel/ptrace.c | 30 ++++++++++--------------------
3 files changed, 18 insertions(+), 24 deletions(-)

diff --git a/arch/tile/kernel/intvec_32.S b/arch/tile/kernel/intvec_32.S
index 6943515..6c3f597 100644
--- a/arch/tile/kernel/intvec_32.S
+++ b/arch/tile/kernel/intvec_32.S
@@ -1201,7 +1201,8 @@ handle_syscall:
lw r30, r31
andi r30, r30, _TIF_SYSCALL_TRACE
bzt r30, .Lrestore_syscall_regs
- jal do_syscall_trace
+ PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
+ jal do_syscall_trace_enter
FEEDBACK_REENTER(handle_syscall)

/*
@@ -1252,7 +1253,8 @@ handle_syscall:
lw r30, r31
andi r30, r30, _TIF_SYSCALL_TRACE
bzt r30, 1f
- jal do_syscall_trace
+ PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
+ jal do_syscall_trace_exit
FEEDBACK_REENTER(handle_syscall)
1: {
movei r30, 0 /* not an NMI */
diff --git a/arch/tile/kernel/intvec_64.S b/arch/tile/kernel/intvec_64.S
index 7c06d59..a717279 100644
--- a/arch/tile/kernel/intvec_64.S
+++ b/arch/tile/kernel/intvec_64.S
@@ -1006,7 +1006,8 @@ handle_syscall:
addi r30, r31, THREAD_INFO_STATUS_OFFSET - THREAD_INFO_FLAGS_OFFSET
beqzt r30, .Lrestore_syscall_regs
}
- jal do_syscall_trace
+ PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
+ jal do_syscall_trace_enter
FEEDBACK_REENTER(handle_syscall)

/*
@@ -1075,7 +1076,8 @@ handle_syscall:
andi r0, r30, _TIF_SINGLESTEP
beqzt r0, 1f
}
- jal do_syscall_trace
+ PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
+ jal do_syscall_trace_exit
FEEDBACK_REENTER(handle_syscall)
andi r0, r30, _TIF_SINGLESTEP

diff --git a/arch/tile/kernel/ptrace.c b/arch/tile/kernel/ptrace.c
index 9835312..0ab8b76 100644
--- a/arch/tile/kernel/ptrace.c
+++ b/arch/tile/kernel/ptrace.c
@@ -21,6 +21,7 @@
#include <linux/uaccess.h>
#include <linux/regset.h>
#include <linux/elf.h>
+#include <linux/tracehook.h>
#include <asm/traps.h>
#include <arch/chip.h>

@@ -246,29 +247,18 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
}
#endif

-void do_syscall_trace(void)
+int do_syscall_trace_enter(struct pt_regs *regs)
{
- if (!test_thread_flag(TIF_SYSCALL_TRACE))
- return;
-
- if (!(current->ptrace & PT_PTRACED))
- return;
+ if (tracehook_report_syscall_entry(regs)) {
+ regs->regs[TREG_SYSCALL_NR] = -1;
+ }

- /*
- * The 0x80 provides a way for the tracing parent to distinguish
- * between a syscall stop and SIGTRAP delivery
- */
- ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
+ return regs->regs[TREG_SYSCALL_NR];
+}

- /*
- * 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;
- }
+void do_syscall_trace_exit(struct pt_regs *regs)
+{
+ tracehook_report_syscall_exit(regs, 0);
}

void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
--
1.7.1


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