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powerpc/watchpoint: Support for 8xx in ptrace-hwbreak.c selftest 

On the 8xx, signals are generated after executing the instruction. So
no need to manually single-step on 8xx. Also, 8xx __set_dabr()
currently ignores length and hardcodes the length to 8 bytes. So all
unaligned and 512 byte testcase will fail on 8xx. Ignore those
testcases on 8xx.

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191017093204.7511-8-ravi.bangoria@linux.ibm.com
This commit is contained in:
Ravi Bangoria 2019-10-17 15:02:04 +05:30 committed by Michael Ellerman
parent 949758a2f4
commit 5dc7b419a5
1 changed files with 23 additions and 9 deletions
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32
tools/testing/selftests/powerpc/ptrace/ptrace-hwbreak.c
View File

@ -22,6 +22,11 @@
#include <sys/wait.h>
#include "ptrace.h"
#define SPRN_PVR 0x11F
#define PVR_8xx 0x00500000
bool is_8xx;
/*
* Use volatile on all global var so that compiler doesn't
* optimise their load/stores. Otherwise selftest can fail.
@ -205,13 +210,15 @@ static void check_success(pid_t child_pid, const char *name, const char *type,
printf("%s, %s, len: %d: Ok\n", name, type, len);
/*
* For ptrace registered watchpoint, signal is generated
* before executing load/store. Singlestep the instruction
* and then continue the test.
*/
ptrace(PTRACE_SINGLESTEP, child_pid, NULL, 0);
wait(NULL);
if (!is_8xx) {
/*
* For ptrace registered watchpoint, signal is generated
* before executing load/store. Singlestep the instruction
* and then continue the test.
*/
ptrace(PTRACE_SINGLESTEP, child_pid, NULL, 0);
wait(NULL);
}
}
static void ptrace_set_debugreg(pid_t child_pid, unsigned long wp_addr)
@ -447,8 +454,10 @@ run_tests(pid_t child_pid, struct ppc_debug_info *dbginfo, bool dawr)
test_set_debugreg(child_pid);
if (dbginfo->features & PPC_DEBUG_FEATURE_DATA_BP_RANGE) {
test_sethwdebug_exact(child_pid);
test_sethwdebug_range_aligned(child_pid);
if (dawr) {
if (!is_8xx)
test_sethwdebug_range_aligned(child_pid);
if (dawr && !is_8xx) {
test_sethwdebug_range_unaligned(child_pid);
test_sethwdebug_range_unaligned_dar(child_pid);
test_sethwdebug_dawr_max_range(child_pid);
@ -489,5 +498,10 @@ static int ptrace_hwbreak(void)
int main(int argc, char **argv, char **envp)
{
int pvr = 0;
asm __volatile__ ("mfspr %0,%1" : "=r"(pvr) : "i"(SPRN_PVR));
if (pvr == PVR_8xx)
is_8xx = true;
return test_harness(ptrace_hwbreak, "ptrace-hwbreak");
}