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2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d 
 kernel/tools/testing/selftests/powerpc/tm/tm-signal-context-chk-vmx.c
....@@ -1,19 +1,15 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * Copyright 2016, Cyril Bur, IBM Corp.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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- *
94  *
105  * Test the kernel's signal frame code.
116  *
127  * The kernel sets up two sets of ucontexts if the signal was to be
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- * delivered while the thread was in a transaction.
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+ * delivered while the thread was in a transaction (referred too as
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+ * first and second contexts).
1410  * Expected behaviour is that the checkpointed state is in the user
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- * context passed to the signal handler. The speculated state can be
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- * accessed with the uc_link pointer.
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+ * context passed to the signal handler (first context). The speculated
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+ * state can be accessed with the uc_link pointer (second context).
1713  *
1814  * The rationale for this is that if TM unaware code (which linked
1915  * against TM libs) installs a signal handler it will not know of the
....@@ -34,18 +30,24 @@
3430 
3531 #define MAX_ATTEMPT 500000
3632 
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-#define NV_VMX_REGS 12
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+#define NV_VMX_REGS 12 /* Number of non-volatile VMX registers */
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+#define VMX20 20 /* First non-volatile register to check in vr20-31 subset */
3835 
3936 long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);
4037 
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-static sig_atomic_t fail;
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+static sig_atomic_t fail, broken;
4239 
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+/* Test only non-volatile registers, i.e. 12 vmx registers from vr20 to vr31 */
4341 vector int vms[] = {
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-	{1, 2, 3, 4 },{5, 6, 7, 8 },{9, 10,11,12},
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+	/* First context will be set with these values, i.e. non-speculative */
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+	/* VMX20     ,  VMX21      , ... */
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+	{ 1, 2, 3, 4},{ 5, 6, 7, 8},{ 9,10,11,12},
4545 	{13,14,15,16},{17,18,19,20},{21,22,23,24},
4646 	{25,26,27,28},{29,30,31,32},{33,34,35,36},
4747 	{37,38,39,40},{41,42,43,44},{45,46,47,48},
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-	{-1, -2, -3, -4}, {-5, -6, -7, -8}, {-9, -10,-11,-12},
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+	/* Second context will be set with these values, i.e. speculative */
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+	/* VMX20        , VMX21            , ... */
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+	{ -1, -2, -3, -4},{ -5, -6, -7, -8},{ -9,-10,-11,-12},
4951 	{-13,-14,-15,-16},{-17,-18,-19,-20},{-21,-22,-23,-24},
5052 	{-25,-26,-27,-28},{-29,-30,-31,-32},{-33,-34,-35,-36},
5153 	{-37,-38,-39,-40},{-41,-42,-43,-44},{-45,-46,-47,-48}
....@@ -53,26 +55,43 @@
5355 
5456 static void signal_usr1(int signum, siginfo_t *info, void *uc)
5557 {
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-	int i;
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+	int i, j;
5759 	ucontext_t *ucp = uc;
5860 	ucontext_t *tm_ucp = ucp->uc_link;
5961 
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-	for (i = 0; i < NV_VMX_REGS && !fail; i++) {
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-		fail = memcmp(ucp->uc_mcontext.v_regs->vrregs[i + 20],
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+	for (i = 0; i < NV_VMX_REGS; i++) {
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+		/* Check first context. Print all mismatches. */
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+		fail = memcmp(ucp->uc_mcontext.v_regs->vrregs[VMX20 + i],
6265 				&vms[i], sizeof(vector int));
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-		fail |= memcmp(tm_ucp->uc_mcontext.v_regs->vrregs[i + 20],
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-				&vms[i + NV_VMX_REGS], sizeof (vector int));
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-
6666 		if (fail) {
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-			int j;
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-
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-			fprintf(stderr, "Failed on %d vmx 0x", i);
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+			broken = 1;
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+			printf("VMX%d (1st context) == 0x", VMX20 + i);
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+			/* Print actual value in first context. */
7070 			for (j = 0; j < 4; j++)
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-				fprintf(stderr, "%04x", ucp->uc_mcontext.v_regs->vrregs[i + 20][j]);
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-			fprintf(stderr, " vs 0x");
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-			for (j = 0 ; j < 4; j++)
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-				fprintf(stderr, "%04x", tm_ucp->uc_mcontext.v_regs->vrregs[i + 20][j]);
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-			fprintf(stderr, "\n");
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+				printf("%08x", ucp->uc_mcontext.v_regs->vrregs[VMX20 + i][j]);
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+			printf(" instead of 0x");
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+			/* Print expected value. */
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+			for (j = 0; j < 4; j++)
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+				printf("%08x", vms[i][j]);
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+			printf(" (expected)\n");
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+		}
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+	}
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+
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+	for (i = 0; i < NV_VMX_REGS; i++)  {
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+		/* Check second context. Print all mismatches. */
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+		fail = memcmp(tm_ucp->uc_mcontext.v_regs->vrregs[VMX20 + i],
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+				&vms[NV_VMX_REGS + i], sizeof (vector int));
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+		if (fail) {
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+			broken = 1;
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+			printf("VMX%d (2nd context) == 0x", NV_VMX_REGS + i);
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+			/* Print actual value in second context. */
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+			for (j = 0; j < 4; j++)
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+				printf("%08x", tm_ucp->uc_mcontext.v_regs->vrregs[VMX20 + i][j]);
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+			printf(" instead of 0x");
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+			/* Print expected value. */
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+			for (j = 0; j < 4; j++)
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+				printf("%08x", vms[NV_VMX_REGS + i][j]);
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+			printf(" (expected)\n");
7695 		}
7796 	}
7897 }
....@@ -95,13 +114,19 @@
95114 	}
96115 
97116 	i = 0;
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-	while (i < MAX_ATTEMPT && !fail) {
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+	while (i < MAX_ATTEMPT && !broken) {
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+		/*
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+		 * tm_signal_self_context_load will set both first and second
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+		 * contexts accordingly to the values passed through non-NULL
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+		 * array pointers to it, in that case 'vms', and invoke the
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+		 * signal handler installed for SIGUSR1.
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+		 */
99124 		rc = tm_signal_self_context_load(pid, NULL, NULL, vms, NULL);
100125 		FAIL_IF(rc != pid);
101126 		i++;
102127 	}
103128 
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-	return fail;
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+	return (broken);
105130 }
106131 
107132 int main(void)