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[RFC,v2,02/28] ARM: ptrace: Split report_syscall()

Message ID 20241029-arm-generic-entry-v2-2-573519abef38@linaro.org (mailing list archive)
State New
Headers show
Series ARM: Switch to generic entry | expand

Commit Message

Linus Walleij Oct. 29, 2024, 10:52 a.m. UTC 
The generic entry code requires that report_syscall() be provided
in two parts: report_syscall_enter() and report_syscall_exit()
so split the combined function in two.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/arm/kernel/ptrace.c | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)
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Patch

diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index c421a899fc84..07b0daf47441 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -827,31 +827,45 @@  enum ptrace_syscall_dir {
 	PTRACE_SYSCALL_EXIT,
 };
 
-static void report_syscall(struct pt_regs *regs, enum ptrace_syscall_dir dir)
+static void report_syscall_enter(struct pt_regs *regs)
 {
 	unsigned long ip;
 
 	/*
 	 * IP is used to denote syscall entry/exit:
-	 * IP = 0 -> entry, =1 -> exit
+	 * IP = 0 -> entry
 	 */
 	ip = regs->ARM_ip;
-	regs->ARM_ip = dir;
+	regs->ARM_ip = PTRACE_SYSCALL_ENTER;
 
-	if (dir == PTRACE_SYSCALL_EXIT)
-		ptrace_report_syscall_exit(regs, 0);
-	else if (ptrace_report_syscall_entry(regs))
+	if (ptrace_report_syscall_entry(regs))
 		current_thread_info()->abi_syscall = -1;
 
 	regs->ARM_ip = ip;
 }
 
+static void report_syscall_exit(struct pt_regs *regs)
+{
+	unsigned long ip;
+
+	/*
+	 * IP is used to denote syscall entry/exit:
+	 * IP = 1 -> exit
+	 */
+	ip = regs->ARM_ip;
+	regs->ARM_ip = PTRACE_SYSCALL_EXIT;
+
+	ptrace_report_syscall_exit(regs, 0);
+
+	regs->ARM_ip = ip;
+}
+
 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
 {
 	int scno;
 
 	if (test_thread_flag(TIF_SYSCALL_TRACE))
-		report_syscall(regs, PTRACE_SYSCALL_ENTER);
+		report_syscall_enter(regs);
 
 	/* Do seccomp after ptrace; syscall may have changed. */
 #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
@@ -892,5 +906,5 @@  asmlinkage void syscall_trace_exit(struct pt_regs *regs)
 		trace_sys_exit(regs, regs_return_value(regs));
 
 	if (test_thread_flag(TIF_SYSCALL_TRACE))
-		report_syscall(regs, PTRACE_SYSCALL_EXIT);
+		report_syscall_exit(regs);
 }