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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>
This commit is contained in:
Cyril Bur
Michael Ellerman
parent
ef186331b4
commit
f10d4424b2
@ -1,5 +1,7 @@
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SIGNAL_CONTEXT_CHK_TESTS := tm-signal-context-chk-gpr
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TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack \
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tm-vmxcopy tm-fork tm-tar tm-tmspr tm-exec tm-execed
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tm-vmxcopy tm-fork tm-tar tm-tmspr $(SIGNAL_CONTEXT_CHK_TESTS)
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all: $(TEST_PROGS)
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@ -11,6 +13,9 @@ tm-syscall: tm-syscall-asm.S
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tm-syscall: CFLAGS += -I../../../../../usr/include
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tm-tmspr: CFLAGS += -pthread
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$(SIGNAL_CONTEXT_CHK_TESTS): tm-signal.S
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$(SIGNAL_CONTEXT_CHK_TESTS): CFLAGS += -mhtm -m64 -mvsx
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include ../../lib.mk
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clean:
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@ -0,0 +1,90 @@
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/*
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* 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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*
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*
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* Test the kernel's signal frame code.
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*
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* 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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* 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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*
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* The rationale for this is that if TM unaware code (which linked
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* against TM libs) installs a signal handler it will not know of the
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* speculative nature of the 'live' registers and may infer the wrong
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* thing.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <signal.h>
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#include <unistd.h>
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#include <altivec.h>
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#include "utils.h"
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#include "tm.h"
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#define MAX_ATTEMPT 500000
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#define NV_GPR_REGS 18
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long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);
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static sig_atomic_t fail;
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static long gps[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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-1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18};
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static void signal_usr1(int signum, siginfo_t *info, void *uc)
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{
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int i;
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ucontext_t *ucp = uc;
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ucontext_t *tm_ucp = ucp->uc_link;
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for (i = 0; i < NV_GPR_REGS && !fail; i++) {
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fail = (ucp->uc_mcontext.gp_regs[i + 14] != gps[i]);
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fail |= (tm_ucp->uc_mcontext.gp_regs[i + 14] != gps[i + NV_GPR_REGS]);
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if (fail)
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printf("Failed on %d GPR %lu or %lu\n", i,
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ucp->uc_mcontext.gp_regs[i + 14], tm_ucp->uc_mcontext.gp_regs[i + 14]);
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}
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}
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static int tm_signal_context_chk_gpr()
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{
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struct sigaction act;
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int i;
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long rc;
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pid_t pid = getpid();
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SKIP_IF(!have_htm());
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act.sa_sigaction = signal_usr1;
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sigemptyset(&act.sa_mask);
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act.sa_flags = SA_SIGINFO;
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if (sigaction(SIGUSR1, &act, NULL) < 0) {
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perror("sigaction sigusr1");
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exit(1);
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}
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i = 0;
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while (i < MAX_ATTEMPT && !fail) {
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rc = tm_signal_self_context_load(pid, gps, NULL, NULL, NULL);
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FAIL_IF(rc != pid);
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i++;
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}
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return fail;
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}
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int main(void)
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{
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return test_harness(tm_signal_context_chk_gpr, "tm_signal_context_chk_gpr");
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}
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114
tools/testing/selftests/powerpc/tm/tm-signal.S
Normal file
114
tools/testing/selftests/powerpc/tm/tm-signal.S
Normal file
@ -0,0 +1,114 @@
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/*
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* Copyright 2015, 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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*/
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#include "../basic_asm.h"
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#include "../gpr_asm.h"
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#include "../fpu_asm.h"
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#include "../vmx_asm.h"
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#include "../vsx_asm.h"
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/*
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* Large caveat here being that the caller cannot expect the
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* signal to always be sent! The hardware can (AND WILL!) abort
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* the transaction between the tbegin and the tsuspend (however
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* unlikely it seems or infrequently it actually happens).
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* You have been warned.
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*/
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/* long tm_signal_self(pid_t pid, long *gprs, double *fps, vector *vms, vector *vss); */
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FUNC_START(tm_signal_self_context_load)
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PUSH_BASIC_STACK(512)
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/*
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* Don't strictly need to save and restore as it depends on if
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* we're going to use them, however this reduces messy logic
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*/
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PUSH_VMX(STACK_FRAME_LOCAL(5,0),r8)
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PUSH_FPU(512)
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PUSH_NVREGS_BELOW_FPU(512)
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std r3, STACK_FRAME_PARAM(0)(sp) /* pid */
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std r4, STACK_FRAME_PARAM(1)(sp) /* gps */
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std r5, STACK_FRAME_PARAM(2)(sp) /* fps */
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std r6, STACK_FRAME_PARAM(3)(sp) /* vms */
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std r7, STACK_FRAME_PARAM(4)(sp) /* vss */
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ld r3, STACK_FRAME_PARAM(1)(sp)
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cmpdi r3, 0
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beq skip_gpr_lc
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bl load_gpr
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skip_gpr_lc:
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ld r3, STACK_FRAME_PARAM(2)(sp)
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cmpdi r3, 0
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beq skip_fpu_lc
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bl load_fpu
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skip_fpu_lc:
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ld r3, STACK_FRAME_PARAM(3)(sp)
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cmpdi r3, 0
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beq skip_vmx_lc
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bl load_vmx
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skip_vmx_lc:
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ld r3, STACK_FRAME_PARAM(4)(sp)
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cmpdi r3, 0
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beq skip_vsx_lc
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bl load_vsx
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skip_vsx_lc:
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/*
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* Set r3 (return value) before tbegin. Use the pid as a known
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* 'all good' return value, zero is used to indicate a non-doomed
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* transaction.
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*/
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ld r3, STACK_FRAME_PARAM(0)(sp)
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tbegin.
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beq 1f
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tsuspend. /* Can't enter a syscall transactionally */
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ld r3, STACK_FRAME_PARAM(1)(sp)
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cmpdi r3, 0
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beq skip_gpr_lt
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/* Get the second half of the array */
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addi r3, r3, 8 * 18
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bl load_gpr
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skip_gpr_lt:
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ld r3, STACK_FRAME_PARAM(2)(sp)
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cmpdi r3, 0
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beq skip_fpu_lt
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/* Get the second half of the array */
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addi r3, r3, 8 * 18
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bl load_fpu
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skip_fpu_lt:
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ld r3, STACK_FRAME_PARAM(3)(sp)
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cmpdi r3, 0
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beq skip_vmx_lt
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/* Get the second half of the array */
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addi r3, r3, 16 * 12
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bl load_vmx
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skip_vmx_lt:
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ld r3, STACK_FRAME_PARAM(4)(sp)
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cmpdi r3, 0
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beq skip_vsx_lt
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/* Get the second half of the array */
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addi r3, r3, 16 * 12
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bl load_vsx
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skip_vsx_lt:
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li r0, 37 /* sys_kill */
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ld r3, STACK_FRAME_PARAM(0)(sp) /* pid */
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li r4, 10 /* SIGUSR1 */
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sc /* Taking the signal will doom the transaction */
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tabort. 0
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tresume. /* Be super sure we abort */
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/*
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* This will cause us to resume doomed transaction and cause
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* hardware to cleanup, we'll end up at 1: anything between
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* tresume. and 1: shouldn't ever run.
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*/
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li r3, 0
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1:
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POP_VMX(STACK_FRAME_LOCAL(5,0),r4)
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POP_FPU(512)
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POP_NVREGS_BELOW_FPU(512)
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POP_BASIC_STACK(512)
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blr
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FUNC_END(tm_signal_self_context_load)
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