diff mbox series

[v6,18/28] powerpc/xmon: Use a function for reading instructions

Message ID 20200428015814.15380-19-jniethe5@gmail.com (mailing list archive)
State Superseded
Headers show
Series Initial Prefixed Instruction support | expand

Checks

Context Check Description
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/merge (54dc28ff5e0b3585224d49a31b53e030342ca5c3)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/next (45591da765885f7320a111d290b3a28a23eed359)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch linus/master (51184ae37e0518fd90cb437a2fbc953ae558cd0d)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/fixes (5990cdee689c6885b27c6d969a3d58b09002b0bc)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch linux-next (8bdabd09ec86a993419c8c98a4f34c12bc902c6c)
snowpatch_ozlabs/apply_patch fail Failed to apply to any branch

Commit Message

Jordan Niethe April 28, 2020, 1:58 a.m. UTC 
Currently in xmon, mread() is used for reading instructions. In
preparation for prefixed instructions, create and use a new function,
mread_instr(), especially for reading instructions.

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
---
v5: New to series, seperated from "Add prefixed instructions to
    instruction data type"
v6: mread_instr(): correctly return error status
---
 arch/powerpc/xmon/xmon.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 65abae7a0103..716967f12063 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -121,6 +121,7 @@  static unsigned bpinstr = 0x7fe00008;	/* trap */
 static int cmds(struct pt_regs *);
 static int mread(unsigned long, void *, int);
 static int mwrite(unsigned long, void *, int);
+static int mread_instr(unsigned long, struct ppc_inst *);
 static int handle_fault(struct pt_regs *);
 static void byterev(unsigned char *, int);
 static void memex(void);
@@ -895,7 +896,7 @@  static void insert_bpts(void)
 	for (i = 0; i < NBPTS; ++i, ++bp) {
 		if ((bp->enabled & (BP_TRAP|BP_CIABR)) == 0)
 			continue;
-		if (mread(bp->address, &instr, 4) != 4) {
+		if (!mread_instr(bp->address, &instr)) {
 			printf("Couldn't read instruction at %lx, "
 			       "disabling breakpoint there\n", bp->address);
 			bp->enabled = 0;
@@ -945,7 +946,7 @@  static void remove_bpts(void)
 	for (i = 0; i < NBPTS; ++i, ++bp) {
 		if ((bp->enabled & (BP_TRAP|BP_CIABR)) != BP_TRAP)
 			continue;
-		if (mread(bp->address, &instr, 4) == 4
+		if (mread_instr(bp->address, &instr)
 		    && ppc_inst_equal(instr, ppc_inst(bpinstr))
 		    && patch_instruction(
 			(struct ppc_inst *)bp->address, ppc_inst_read(bp->instr)) != 0)
@@ -1161,7 +1162,7 @@  static int do_step(struct pt_regs *regs)
 	force_enable_xmon();
 	/* check we are in 64-bit kernel mode, translation enabled */
 	if ((regs->msr & (MSR_64BIT|MSR_PR|MSR_IR)) == (MSR_64BIT|MSR_IR)) {
-		if (mread(regs->nip, &instr, 4) == 4) {
+		if (mread_instr(regs->nip, &instr)) {
 			stepped = emulate_step(regs, instr);
 			if (stepped < 0) {
 				printf("Couldn't single-step %s instruction\n",
@@ -1328,7 +1329,7 @@  static long check_bp_loc(unsigned long addr)
 		printf("Breakpoints may only be placed at kernel addresses\n");
 		return 0;
 	}
-	if (!mread(addr, &instr, sizeof(instr))) {
+	if (!mread_instr(addr, &instr)) {
 		printf("Can't read instruction at address %lx\n", addr);
 		return 0;
 	}
@@ -2121,6 +2122,25 @@  mwrite(unsigned long adrs, void *buf, int size)
 	return n;
 }
 
+static int
+mread_instr(unsigned long adrs, struct ppc_inst *instr)
+{
+	volatile int n;
+
+	n = 0;
+	if (setjmp(bus_error_jmp) == 0) {
+		catch_memory_errors = 1;
+		sync();
+		*instr = ppc_inst_read((struct ppc_inst *)adrs);
+		sync();
+		/* wait a little while to see if we get a machine check */
+		__delay(200);
+		n = ppc_inst_len(*instr);
+	}
+	catch_memory_errors = 0;
+	return n;
+}
+
 static int fault_type;
 static int fault_except;
 static char *fault_chars[] = { "--", "**", "##" };