+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: $(TEST_PROGS)
tm-syscall: CFLAGS += -I../../../../../usr/include
tm-tmspr: CFLAGS += -pthread
+$(SIGNAL_CONTEXT_CHK_TESTS): tm-signal.S
+$(SIGNAL_CONTEXT_CHK_TESTS): CFLAGS += -mhtm -m64 -mvsx
+
include ../../lib.mk
clean:
--- /dev/null
+/*
+ * 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");
+}
--- /dev/null
+/*
+ * 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 */
+ addi r3, r3, 8 * 18
+ bl load_gpr
+skip_gpr_lt:
+ ld r3, STACK_FRAME_PARAM(2)(sp)
+ cmpdi r3, 0
+ beq skip_fpu_lt
+ /* Get the second half of the array */
+ addi r3, r3, 8 * 18
+ bl load_fpu
+skip_fpu_lt:
+ ld r3, STACK_FRAME_PARAM(3)(sp)
+ cmpdi r3, 0
+ beq skip_vmx_lt
+ /* Get the second half of the array */
+ addi r3, r3, 16 * 12
+ bl load_vmx
+skip_vmx_lt:
+ ld r3, STACK_FRAME_PARAM(4)(sp)
+ cmpdi r3, 0
+ beq skip_vsx_lt
+ /* Get the second half of the array */
+ addi r3, r3, 16 * 12
+ bl load_vsx
+skip_vsx_lt:
+ li r0, 37 /* sys_kill */
+ ld r3, STACK_FRAME_PARAM(0)(sp) /* pid */
+ li r4, 10 /* SIGUSR1 */
+ sc /* Taking the signal will doom the transaction */
+ tabort. 0
+ tresume. /* Be super sure we abort */
+ /*
+ * This will cause us to resume doomed transaction and cause
+ * hardware to cleanup, we'll end up at 1: anything between
+ * tresume. and 1: shouldn't ever run.
+ */
+ li r3, 0
+ 1:
+ POP_VMX(STACK_FRAME_LOCAL(5,0),r4)
+ POP_FPU(512)
+ POP_NVREGS_BELOW_FPU(512)
+ POP_BASIC_STACK(512)
+ blr
+FUNC_END(tm_signal_self_context_load)
projects / linux-beck.git / commitdiff