x86,objtool: Introduce ORC_TYPE_*

Unwind hints and ORC entry types are two distinct things.  Separate them
out more explicitly.
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/cc879d38fff8a43f8f7beb2fd56e35a5a384d7cd.1677683419.git.jpoimboe@kernel.org

arch/x86/include/asm/orc_types.h

@@ -39,6 +39,10 @@
 #define ORC_REG_SP_INDIRECT		9
 #define ORC_REG_MAX			15
 
+#define ORC_TYPE_CALL			0
+#define ORC_TYPE_REGS			1
+#define ORC_TYPE_REGS_PARTIAL		2
+
 #ifndef __ASSEMBLY__
 #include <asm/byteorder.h>
 

arch/x86/kernel/unwind_orc.c

@@ -133,7 +133,7 @@ static struct orc_entry null_orc_entry = {
 	.sp_offset = sizeof(long),
 	.sp_reg = ORC_REG_SP,
 	.bp_reg = ORC_REG_UNDEFINED,
-	.type = UNWIND_HINT_TYPE_CALL
+	.type = ORC_TYPE_CALL
 };
 
 #ifdef CONFIG_CALL_THUNKS
@@ -153,7 +153,7 @@ static struct orc_entry *orc_callthunk_find(unsigned long ip)
 
 /* Fake frame pointer entry -- used as a fallback for generated code */
 static struct orc_entry orc_fp_entry = {
-	.type		= UNWIND_HINT_TYPE_CALL,
+	.type		= ORC_TYPE_CALL,
 	.sp_reg		= ORC_REG_BP,
 	.sp_offset	= 16,
 	.bp_reg		= ORC_REG_PREV_SP,
@@ -554,7 +554,7 @@ bool unwind_next_frame(struct unwind_state *state)
 
 	/* Find IP, SP and possibly regs: */
 	switch (orc->type) {
-	case UNWIND_HINT_TYPE_CALL:
+	case ORC_TYPE_CALL:
 		ip_p = sp - sizeof(long);
 
 		if (!deref_stack_reg(state, ip_p, &state->ip))
@@ -567,7 +567,7 @@ bool unwind_next_frame(struct unwind_state *state)
 		state->prev_regs = NULL;
 		break;
 
-	case UNWIND_HINT_TYPE_REGS:
+	case ORC_TYPE_REGS:
 		if (!deref_stack_regs(state, sp, &state->ip, &state->sp)) {
 			orc_warn_current("can't access registers at %pB\n",
 					 (void *)orig_ip);
@@ -590,13 +590,13 @@ bool unwind_next_frame(struct unwind_state *state)
 		state->full_regs = true;
 		break;
 
-	case UNWIND_HINT_TYPE_REGS_PARTIAL:
+	case ORC_TYPE_REGS_PARTIAL:
 		if (!deref_stack_iret_regs(state, sp, &state->ip, &state->sp)) {
 			orc_warn_current("can't access iret registers at %pB\n",
 					 (void *)orig_ip);
 			goto err;
 		}
-		/* See UNWIND_HINT_TYPE_REGS case comment. */
+		/* See ORC_TYPE_REGS case comment. */
 		state->ip = unwind_recover_rethook(state, state->ip,
 				(unsigned long *)(state->sp - sizeof(long)));
 

include/linux/objtool_types.h

@@ -40,6 +40,7 @@ struct unwind_hint {
 #define UNWIND_HINT_TYPE_CALL		0
 #define UNWIND_HINT_TYPE_REGS		1
 #define UNWIND_HINT_TYPE_REGS_PARTIAL	2
+/* The below hint types don't have corresponding ORC types */
 #define UNWIND_HINT_TYPE_FUNC		3
 #define UNWIND_HINT_TYPE_ENTRY		4
 #define UNWIND_HINT_TYPE_SAVE		5

tools/arch/x86/include/asm/orc_types.h

@@ -39,6 +39,10 @@
 #define ORC_REG_SP_INDIRECT		9
 #define ORC_REG_MAX			15
 
+#define ORC_TYPE_CALL			0
+#define ORC_TYPE_REGS			1
+#define ORC_TYPE_REGS_PARTIAL		2
+
 #ifndef __ASSEMBLY__
 #include <asm/byteorder.h>
 

tools/include/linux/objtool_types.h

@@ -40,6 +40,7 @@ struct unwind_hint {
 #define UNWIND_HINT_TYPE_CALL		0
 #define UNWIND_HINT_TYPE_REGS		1
 #define UNWIND_HINT_TYPE_REGS_PARTIAL	2
+/* The below hint types don't have corresponding ORC types */
 #define UNWIND_HINT_TYPE_FUNC		3
 #define UNWIND_HINT_TYPE_ENTRY		4
 #define UNWIND_HINT_TYPE_SAVE		5

tools/objtool/orc_dump.c

@@ -4,7 +4,6 @@
  */
 
 #include <unistd.h>
-#include <linux/objtool_types.h>
 #include <asm/orc_types.h>
 #include <objtool/objtool.h>
 #include <objtool/warn.h>
@@ -39,11 +38,11 @@ static const char *reg_name(unsigned int reg)
 static const char *orc_type_name(unsigned int type)
 {
 	switch (type) {
-	case UNWIND_HINT_TYPE_CALL:
+	case ORC_TYPE_CALL:
 		return "call";
-	case UNWIND_HINT_TYPE_REGS:
+	case ORC_TYPE_REGS:
 		return "regs";
-	case UNWIND_HINT_TYPE_REGS_PARTIAL:
+	case ORC_TYPE_REGS_PARTIAL:
 		return "regs (partial)";
 	default:
 		return "?";

tools/objtool/orc_gen.c

@@ -26,6 +26,22 @@ static int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi,
 		return 0;
 	}
 
+	switch (cfi->type) {
+	case UNWIND_HINT_TYPE_CALL:
+		orc->type = ORC_TYPE_CALL;
+		break;
+	case UNWIND_HINT_TYPE_REGS:
+		orc->type = ORC_TYPE_REGS;
+		break;
+	case UNWIND_HINT_TYPE_REGS_PARTIAL:
+		orc->type = ORC_TYPE_REGS_PARTIAL;
+		break;
+	default:
+		WARN_FUNC("unknown unwind hint type %d",
+			  insn->sec, insn->offset, cfi->type);
+		return -1;
+	}
+
 	orc->end = cfi->end;
 	orc->signal = cfi->signal;
 
@@ -83,7 +99,6 @@ static int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi,
 
 	orc->sp_offset = cfi->cfa.offset;
 	orc->bp_offset = bp->offset;
-	orc->type = cfi->type;
 
 	return 0;
 }
@@ -151,7 +166,7 @@ int orc_create(struct objtool_file *file)
 	struct orc_entry null = {
 		.sp_reg  = ORC_REG_UNDEFINED,
 		.bp_reg  = ORC_REG_UNDEFINED,
-		.type    = UNWIND_HINT_TYPE_CALL,
+		.type    = ORC_TYPE_CALL,
 	};
 
 	/* Build a deduplicated list of ORC entries: */