selftests/powerpc: Add checks for transactional GPRs in signal contexts

If a thread receives a signal while transactional the kernel creates a
second context to show the transactional state of the process. This
test loads some known values and waits for a signal and confirms that
the expected values are in the signal context.

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

3 files changed, 210 insertions, 1 deletions

diff --git a/tools/testing/selftests/powerpc/tm/Makefile b/tools/testing/selftests/powerpc/tm/Makefile
index 9d301d785d9e..e1204f6f9175 100644
--- a/tools/testing/selftests/powerpc/tm/Makefile
+++ b/tools/testing/selftests/powerpc/tm/Makefile
@@ -1,5 +1,7 @@
+SIGNAL_CONTEXT_CHK_TESTS := tm-signal-context-chk-gpr
+
 TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack \
-        tm-vmxcopy tm-fork tm-tar tm-tmspr tm-exec tm-execed
+        tm-vmxcopy tm-fork tm-tar tm-tmspr $(SIGNAL_CONTEXT_CHK_TESTS)
 
 all: $(TEST_PROGS)
 
@@ -11,6 +13,9 @@ tm-syscall: tm-syscall-asm.S
 tm-syscall: CFLAGS += -I../../../../../usr/include
 tm-tmspr: CFLAGS += -pthread
 
+$(SIGNAL_CONTEXT_CHK_TESTS): tm-signal.S
+$(SIGNAL_CONTEXT_CHK_TESTS): CFLAGS += -mhtm -m64 -mvsx
+
 include ../../lib.mk
 
 clean:
diff --git a/tools/testing/selftests/powerpc/tm/tm-signal-context-chk-gpr.c b/tools/testing/selftests/powerpc/tm/tm-signal-context-chk-gpr.c
new file mode 100644
index 000000000000..df91330a08ef
--- /dev/null
+++ b/tools/testing/selftests/powerpc/tm/tm-signal-context-chk-gpr.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2016, Cyril Bur, IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ *
+ * Test the kernel's signal frame code.
+ *
+ * The kernel sets up two sets of ucontexts if the signal was to be
+ * delivered while the thread was in a transaction.
+ * Expected behaviour is that the checkpointed state is in the user
+ * context passed to the signal handler. The speculated state can be
+ * accessed with the uc_link pointer.
+ *
+ * The rationale for this is that if TM unaware code (which linked
+ * against TM libs) installs a signal handler it will not know of the
+ * speculative nature of the 'live' registers and may infer the wrong
+ * thing.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <signal.h>
+#include <unistd.h>
+
+#include <altivec.h>
+
+#include "utils.h"
+#include "tm.h"
+
+#define MAX_ATTEMPT 500000
+
+#define NV_GPR_REGS 18
+
+long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);
+
+static sig_atomic_t fail;
+
+static long gps[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+                                         -1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18};
+
+static void signal_usr1(int signum, siginfo_t *info, void *uc)
+{
+        int i;
+        ucontext_t *ucp = uc;
+        ucontext_t *tm_ucp = ucp->uc_link;
+
+        for (i = 0; i < NV_GPR_REGS && !fail; i++) {
+                fail = (ucp->uc_mcontext.gp_regs[i + 14] != gps[i]);
+                fail |= (tm_ucp->uc_mcontext.gp_regs[i + 14] != gps[i + NV_GPR_REGS]);
+                if (fail)
+                        printf("Failed on %d GPR %lu or %lu\n", i,
+                                        ucp->uc_mcontext.gp_regs[i + 14], tm_ucp->uc_mcontext.gp_regs[i + 14]);
+        }
+}
+
+static int tm_signal_context_chk_gpr()
+{
+        struct sigaction act;
+        int i;
+        long rc;
+        pid_t pid = getpid();
+
+        SKIP_IF(!have_htm());
+
+        act.sa_sigaction = signal_usr1;
+        sigemptyset(&act.sa_mask);
+        act.sa_flags = SA_SIGINFO;
+        if (sigaction(SIGUSR1, &act, NULL) < 0) {
+                perror("sigaction sigusr1");
+                exit(1);
+        }
+
+        i = 0;
+        while (i < MAX_ATTEMPT && !fail) {
+                rc = tm_signal_self_context_load(pid, gps, NULL, NULL, NULL);
+                FAIL_IF(rc != pid);
+                i++;
+        }
+
+        return fail;
+}
+
+int main(void)
+{
+        return test_harness(tm_signal_context_chk_gpr, "tm_signal_context_chk_gpr");
+}
diff --git a/tools/testing/selftests/powerpc/tm/tm-signal.S b/tools/testing/selftests/powerpc/tm/tm-signal.S
new file mode 100644
index 000000000000..4e13e8b3a96f
--- /dev/null
+++ b/tools/testing/selftests/powerpc/tm/tm-signal.S
@@ -0,0 +1,114 @@
+/*
+ * Copyright 2015, Cyril Bur, IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include "../basic_asm.h"
+#include "../gpr_asm.h"
+#include "../fpu_asm.h"
+#include "../vmx_asm.h"
+#include "../vsx_asm.h"
+
+/*
+ * Large caveat here being that the caller cannot expect the
+ * signal to always be sent! The hardware can (AND WILL!) abort
+ * the transaction between the tbegin and the tsuspend (however
+ * unlikely it seems or infrequently it actually happens).
+ * You have been warned.
+ */
+/* long tm_signal_self(pid_t pid, long *gprs, double *fps, vector *vms, vector *vss); */
+FUNC_START(tm_signal_self_context_load)
+        PUSH_BASIC_STACK(512)
+        /*
+         * Don't strictly need to save and restore as it depends on if
+         * we're going to use them, however this reduces messy logic
+         */
+        PUSH_VMX(STACK_FRAME_LOCAL(5,0),r8)
+        PUSH_FPU(512)
+        PUSH_NVREGS_BELOW_FPU(512)
+        std r3, STACK_FRAME_PARAM(0)(sp) /* pid */
+        std r4, STACK_FRAME_PARAM(1)(sp) /* gps */
+        std r5, STACK_FRAME_PARAM(2)(sp) /* fps */
+        std r6, STACK_FRAME_PARAM(3)(sp) /* vms */
+        std r7, STACK_FRAME_PARAM(4)(sp) /* vss */
+
+        ld r3, STACK_FRAME_PARAM(1)(sp)
+        cmpdi r3, 0
+        beq skip_gpr_lc
+        bl load_gpr
+skip_gpr_lc:
+        ld r3, STACK_FRAME_PARAM(2)(sp)
+        cmpdi   r3, 0
+        beq     skip_fpu_lc
+        bl load_fpu
+skip_fpu_lc:
+        ld r3, STACK_FRAME_PARAM(3)(sp)
+        cmpdi r3, 0
+        beq     skip_vmx_lc
+        bl load_vmx
+skip_vmx_lc:
+        ld r3, STACK_FRAME_PARAM(4)(sp)
+        cmpdi   r3, 0
+        beq     skip_vsx_lc
+        bl load_vsx
+skip_vsx_lc:
+        /*
+         * Set r3 (return value) before tbegin. Use the pid as a known
+         * 'all good' return value, zero is used to indicate a non-doomed
+         * transaction.
+         */
+        ld      r3, STACK_FRAME_PARAM(0)(sp)
+        tbegin.
+        beq     1f
+        tsuspend. /* Can't enter a syscall transactionally */
+        ld      r3, STACK_FRAME_PARAM(1)(sp)
+        cmpdi   r3, 0
+        beq skip_gpr_lt
+        /* Get the second half of the array */