target/linux/mediatek/patches-5.4/999-2001-kgdb-add-interrupt-control.patch

From 766f65096433dde206cdfa19c2cd644be6beaf32 Mon Sep 17 00:00:00 2001
From: Sam Shih <sam.shih@mediatek.com>
Date: Fri, 2 Jun 2023 13:06:02 +0800
Subject: [PATCH] [basic-part][999-2001-kgdb-add-interrupt-control.patch]

---
 arch/arm64/kernel/kgdb.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm64/kernel/kgdb.c b/arch/arm64/kernel/kgdb.c
index 1a157ca33..258fe4b38 100644
--- a/arch/arm64/kernel/kgdb.c
+++ b/arch/arm64/kernel/kgdb.c
@@ -18,6 +18,10 @@
 #include <asm/debug-monitors.h>
 #include <asm/insn.h>
 #include <asm/traps.h>
+#include <asm/ptrace.h>
+
+
+static DEFINE_PER_CPU(unsigned int, kgdb_pstate);
 
 struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = {
 	{ "x0", 8, offsetof(struct pt_regs, regs[0])},
@@ -206,6 +210,8 @@ int kgdb_arch_handle_exception(int exception_vector, int signo,
 		err = 0;
 		break;
 	case 's':
+		__this_cpu_write(kgdb_pstate, linux_regs->pstate);
+		linux_regs->pstate |= PSR_I_BIT;
 		/*
 		 * Update step address value with address passed
 		 * with step packet.
@@ -249,9 +255,17 @@ NOKPROBE_SYMBOL(kgdb_compiled_brk_fn);
 
 static int kgdb_step_brk_fn(struct pt_regs *regs, unsigned int esr)
 {
+	unsigned int pstate;
+
 	if (!kgdb_single_step)
 		return DBG_HOOK_ERROR;
+	kernel_disable_single_step();
 
+	pstate = __this_cpu_read(kgdb_pstate);
+	if (pstate & PSR_I_BIT)
+		regs->pstate |= PSR_I_BIT;
+	else
+		regs->pstate &= ~PSR_I_BIT;
 	kgdb_handle_exception(0, SIGTRAP, 0, regs);
 	return DBG_HOOK_HANDLED;
 }
-- 
2.34.1