ARC: pt_regs: create seperate type for ecr

Reduces duplication in each ISA specific pt_regs

Tested-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202308151342.ROQ9Urvv-lkp@intel.com
Signed-off-by: Vineet Gupta <vgupta@kernel.org>

Author: vineetgarc

arch/arc/include/asm/ptrace.h

@@ -12,6 +12,17 @@
 
 #ifndef __ASSEMBLY__
 
+typedef union {
+	struct {
+#ifdef CONFIG_CPU_BIG_ENDIAN
+		unsigned long state:8, vec:8, cause:8, param:8;
+#else
+		unsigned long param:8, cause:8, vec:8, state:8;
+#endif
+	};
+	unsigned long full;
+} ecr_reg;
+
 /* THE pt_regs: Defines how regs are saved during entry into kernel */
 
 #ifdef CONFIG_ISA_ARCOMPACT
@@ -40,40 +51,18 @@ struct pt_regs {
 	 * 	Last word used by Linux for extra state mgmt (syscall-restart)
 	 * For interrupts, use artificial ECR values to note current prio-level
 	 */
-	union {
-		struct {
-#ifdef CONFIG_CPU_BIG_ENDIAN
-			unsigned long state:8, ecr_vec:8,
-				      ecr_cause:8, ecr_param:8;
-#else
-			unsigned long ecr_param:8, ecr_cause:8,
-				      ecr_vec:8, state:8;
-#endif
-		};
-		unsigned long event;
-	};
+	ecr_reg ecr;
 };
 
-#define MAX_REG_OFFSET offsetof(struct pt_regs, event)
+#define MAX_REG_OFFSET offsetof(struct pt_regs, ecr)
 
 #else
 
 struct pt_regs {
 
 	unsigned long orig_r0;
 
-	union {
-		struct {
-#ifdef CONFIG_CPU_BIG_ENDIAN
-			unsigned long state:8, ecr_vec:8,
-				      ecr_cause:8, ecr_param:8;
-#else
-			unsigned long ecr_param:8, ecr_cause:8,
-				      ecr_vec:8, state:8;
-#endif
-		};
-		unsigned long event;
-	};
+	ecr_reg ecr;		/* Exception Cause Reg */
 
 	unsigned long bta;	/* erbta */
 
@@ -131,13 +120,13 @@ struct callee_regs {
 /* return 1 if PC in delay slot */
 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
 
-#define in_syscall(regs)    ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
-#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
+#define in_syscall(regs)    ((regs->ecr.vec == ECR_V_TRAP) && !regs->ecr.param)
+#define in_brkpt_trap(regs) ((regs->ecr.vec == ECR_V_TRAP) && regs->ecr.param)
 
 #define STATE_SCALL_RESTARTED	0x01
 
-#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
-#define syscall_restartable(reg) !(reg->state &  STATE_SCALL_RESTARTED)
+#define syscall_wont_restart(regs) (regs->ecr.state |= STATE_SCALL_RESTARTED)
+#define syscall_restartable(regs) !(regs->ecr.state &  STATE_SCALL_RESTARTED)
 
 #define current_pt_regs()					\
 ({								\

arch/arc/kernel/asm-offsets.c

@@ -46,7 +46,7 @@ int main(void)
 	BLANK();
 
 	DEFINE(PT_status32, offsetof(struct pt_regs, status32));
-	DEFINE(PT_event, offsetof(struct pt_regs, event));
+	DEFINE(PT_event, offsetof(struct pt_regs, ecr));
 	DEFINE(PT_bta, offsetof(struct pt_regs, bta));
 	DEFINE(PT_sp, offsetof(struct pt_regs, sp));
 	DEFINE(PT_r0, offsetof(struct pt_regs, r0));

arch/arc/kernel/kgdb.c

@@ -175,7 +175,7 @@ void kgdb_trap(struct pt_regs *regs)
 	 * with trap_s 4 (compiled) breakpoints, continuation needs to
 	 * start after the breakpoint.
 	 */
-	if (regs->ecr_param == 3)
+	if (regs->ecr.param == 3)
 		instruction_pointer(regs) -= BREAK_INSTR_SIZE;
 
 	kgdb_handle_exception(1, SIGTRAP, 0, regs);

arch/arc/kernel/ptrace.c

@@ -46,15 +46,15 @@ static const struct pt_regs_offset regoffset_table[] = {
 	REG_OFFSET_NAME(r0),
 	REG_OFFSET_NAME(sp),
 	REG_OFFSET_NAME(orig_r0),
-	REG_OFFSET_NAME(event),
+	REG_OFFSET_NAME(ecr),
 	REG_OFFSET_END,
 };
 
 #else
 
 static const struct pt_regs_offset regoffset_table[] = {
 	REG_OFFSET_NAME(orig_r0),
-	REG_OFFSET_NAME(event),
+	REG_OFFSET_NAME(ecr),
 	REG_OFFSET_NAME(bta),
 	REG_OFFSET_NAME(r26),
 	REG_OFFSET_NAME(fp),

arch/arc/kernel/traps.c

@@ -110,9 +110,7 @@ void do_machine_check_fault(unsigned long address, struct pt_regs *regs)
  */
 void do_non_swi_trap(unsigned long address, struct pt_regs *regs)
 {
-	unsigned int param = regs->ecr_param;
-
-	switch (param) {
+	switch (regs->ecr.param) {
 	case 1:
 		trap_is_brkpt(address, regs);
 		break;

arch/arc/kernel/troubleshoot.c

@@ -115,8 +115,8 @@ static void show_ecr_verbose(struct pt_regs *regs)
 	/* For Data fault, this is data address not instruction addr */
 	address = current->thread.fault_address;
 
-	vec = regs->ecr_vec;
-	cause_code = regs->ecr_cause;
+	vec = regs->ecr.vec;
+	cause_code = regs->ecr.cause;
 
 	/* For DTLB Miss or ProtV, display the memory involved too */
 	if (vec == ECR_V_DTLB_MISS) {
@@ -154,7 +154,7 @@ static void show_ecr_verbose(struct pt_regs *regs)
 		pr_cont("Misaligned r/w from 0x%08lx\n", address);
 #endif
 	} else if (vec == ECR_V_TRAP) {
-		if (regs->ecr_param == 5)
+		if (regs->ecr.param == 5)
 			pr_cont("gcc generated __builtin_trap\n");
 	} else {
 		pr_cont("Check Programmer's Manual\n");
@@ -184,9 +184,10 @@ void show_regs(struct pt_regs *regs)
 	if (user_mode(regs))
 		show_faulting_vma(regs->ret); /* faulting code, not data */
 
-	pr_info("ECR: 0x%08lx EFA: 0x%08lx ERET: 0x%08lx\nSTAT: 0x%08lx",
-		regs->event, current->thread.fault_address, regs->ret,
-		regs->status32);
+	pr_info("ECR: 0x%08lx EFA: 0x%08lx ERET: 0x%08lx\n",
+		regs->ecr.full, current->thread.fault_address, regs->ret);
+
+	pr_info("STAT32: 0x%08lx", regs->status32);
 
 #define STS_BIT(r, bit)	r->status32 & STATUS_##bit##_MASK ? #bit" " : ""
 

arch/arc/mm/fault.c

@@ -100,10 +100,10 @@ void do_page_fault(unsigned long address, struct pt_regs *regs)
 	if (faulthandler_disabled() || !mm)
 		goto no_context;
 
-	if (regs->ecr_cause & ECR_C_PROTV_STORE)	/* ST/EX */
+	if (regs->ecr.cause & ECR_C_PROTV_STORE)	/* ST/EX */
 		write = 1;
-	else if ((regs->ecr_vec == ECR_V_PROTV) &&
-	         (regs->ecr_cause == ECR_C_PROTV_INST_FETCH))
+	else if ((regs->ecr.vec == ECR_V_PROTV) &&
+	         (regs->ecr.cause == ECR_C_PROTV_INST_FETCH))
 		exec = 1;
 
 	flags = FAULT_FLAG_DEFAULT;