[PATCH 3/4] arm64: traps: Pretty-print pstate in register dumps

[Will Deacon]

We can decode the PSTATE easily enough, so pretty-print it in register
dumps.

Signed-off-by: Will Deacon <will.deacon at arm.com>
---
 arch/arm64/kernel/process.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index c20896b8fb2d..be3cf9cd7dec 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -170,6 +170,23 @@ void machine_restart(char *cmd)
 	while (1);
 }
 
+static void print_pstate(struct pt_regs *regs)
+{
+	u64 pstate = regs->pstate;
+	printk("pstate: %08llx (%c%c%c%c %c%c%c%c %cPAN %cUAO)\n",
+		pstate,
+		pstate & PSR_N_BIT ? 'N' : 'n',
+		pstate & PSR_Z_BIT ? 'Z' : 'z',
+		pstate & PSR_C_BIT ? 'C' : 'c',
+		pstate & PSR_V_BIT ? 'V' : 'v',
+		pstate & PSR_D_BIT ? 'D' : 'd',
+		pstate & PSR_A_BIT ? 'A' : 'a',
+		pstate & PSR_I_BIT ? 'I' : 'i',
+		pstate & PSR_F_BIT ? 'F' : 'f',
+		pstate & PSR_PAN_BIT ? '+' : '-',
+		pstate & PSR_UAO_BIT ? '+' : '-');
+}
+
 void __show_regs(struct pt_regs *regs)
 {
 	int i, top_reg;
@@ -186,9 +203,10 @@ void __show_regs(struct pt_regs *regs)
 	}
 
 	show_regs_print_info(KERN_DEFAULT);
+	print_pstate(regs);
 	print_symbol("pc : %s\n", regs->pc);
 	print_symbol("lr : %s\n", lr);
-	printk("sp : %016llx pstate : %08llx\n", sp, regs->pstate);
+	printk("sp : %016llx\n", sp);
 
 	i = top_reg;
 
-- 
2.1.4