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authorGabriel Krisman Bertazi <krisman@collabora.com>2020-11-16 12:42:03 -0500
committerThomas Gleixner <tglx@linutronix.de>2020-11-16 21:53:16 +0100
commit64eb35f701f04b30706e21d1b02636b5d31a37d2 (patch)
tree0c1bd2cbaca2d4f0a71fbd7af1c08095c1b3970e /kernel/entry
parent64c19ba29b66e98af9306b4a7525fb22c895d252 (diff)
ptrace: Migrate TIF_SYSCALL_EMU to use SYSCALL_WORK flag
On architectures using the generic syscall entry code the architecture independent syscall work is moved to flags in thread_info::syscall_work. This removes architecture dependencies and frees up TIF bits. Define SYSCALL_WORK_SYSCALL_EMU, use it in the generic entry code and convert the code which uses the TIF specific helper functions to use the new *_syscall_work() helpers which either resolve to the new mode for users of the generic entry code or to the TIF based functions for the other architectures. Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Andy Lutomirski <luto@kernel.org> Link: https://lore.kernel.org/r/20201116174206.2639648-8-krisman@collabora.com
Diffstat (limited to 'kernel/entry')
-rw-r--r--kernel/entry/common.c19
1 files changed, 10 insertions, 9 deletions
diff --git a/kernel/entry/common.c b/kernel/entry/common.c
index 917328a9edaa..90533f34ea99 100644
--- a/kernel/entry/common.c
+++ b/kernel/entry/common.c
@@ -47,9 +47,9 @@ static long syscall_trace_enter(struct pt_regs *regs, long syscall,
long ret = 0;
/* Handle ptrace */
- if (work & SYSCALL_WORK_SYSCALL_TRACE || ti_work & _TIF_SYSCALL_EMU) {
+ if (work & (SYSCALL_WORK_SYSCALL_TRACE | SYSCALL_WORK_SYSCALL_EMU)) {
ret = arch_syscall_enter_tracehook(regs);
- if (ret || (ti_work & _TIF_SYSCALL_EMU))
+ if (ret || (work & SYSCALL_WORK_SYSCALL_EMU))
return -1L;
}
@@ -208,21 +208,22 @@ static void exit_to_user_mode_prepare(struct pt_regs *regs)
}
#ifndef _TIF_SINGLESTEP
-static inline bool report_single_step(unsigned long ti_work)
+static inline bool report_single_step(unsigned long work)
{
return false;
}
#else
/*
- * If TIF_SYSCALL_EMU is set, then the only reason to report is when
+ * If SYSCALL_EMU is set, then the only reason to report is when
* TIF_SINGLESTEP is set (i.e. PTRACE_SYSEMU_SINGLESTEP). This syscall
* instruction has been already reported in syscall_enter_from_user_mode().
*/
-#define SYSEMU_STEP (_TIF_SINGLESTEP | _TIF_SYSCALL_EMU)
-
-static inline bool report_single_step(unsigned long ti_work)
+static inline bool report_single_step(unsigned long work)
{
- return (ti_work & SYSEMU_STEP) == _TIF_SINGLESTEP;
+ if (!(work & SYSCALL_WORK_SYSCALL_EMU))
+ return false;
+
+ return !!(current_thread_info()->flags & _TIF_SINGLESTEP);
}
#endif
@@ -236,7 +237,7 @@ static void syscall_exit_work(struct pt_regs *regs, unsigned long ti_work,
if (work & SYSCALL_WORK_SYSCALL_TRACEPOINT)
trace_sys_exit(regs, syscall_get_return_value(current, regs));
- step = report_single_step(ti_work);
+ step = report_single_step(work);
if (step || work & SYSCALL_WORK_SYSCALL_TRACE)
arch_syscall_exit_tracehook(regs, step);
}