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powerpc/watchpoint/xmon: Support 2nd DAWR 

Add support for 2nd DAWR in xmon. With this, we can have two
simultaneous breakpoints from xmon.

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Michael Neuling <mikey@neuling.org>
Link: https://lore.kernel.org/r/20200514111741.97993-17-ravi.bangoria@linux.ibm.com
This commit is contained in:
Ravi Bangoria 2020-05-14 16:47:41 +05:30 committed by Michael Ellerman
parent 514db915e7
commit 30df74d67d
1 changed files with 69 additions and 32 deletions
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101
arch/powerpc/xmon/xmon.c
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@ -112,7 +112,7 @@ struct bpt {
#define BP_DABR 4
static struct bpt bpts[NBPTS];
static struct bpt dabr;
static struct bpt dabr[HBP_NUM_MAX];
static struct bpt *iabr;
static unsigned bpinstr = 0x7fe00008; /* trap */
@ -784,10 +784,17 @@ static int xmon_sstep(struct pt_regs *regs)
static int xmon_break_match(struct pt_regs *regs)
{
int i;
if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT))
return 0;
if (dabr.enabled == 0)
return 0;
for (i = 0; i < nr_wp_slots(); i++) {
if (dabr[i].enabled)
goto found;
}
return 0;
found:
xmon_core(regs, 0);
return 1;
}
@ -948,13 +955,16 @@ static void insert_bpts(void)
static void insert_cpu_bpts(void)
{
int i;
struct arch_hw_breakpoint brk;
if (dabr.enabled) {
brk.address = dabr.address;
brk.type = (dabr.enabled & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL;
brk.len = DABR_MAX_LEN;
__set_breakpoint(0, &brk);
for (i = 0; i < nr_wp_slots(); i++) {
if (dabr[i].enabled) {
brk.address = dabr[i].address;
brk.type = (dabr[i].enabled & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL;
brk.len = 8;
__set_breakpoint(i, &brk);
}
}
if (iabr)
@ -1366,6 +1376,35 @@ static long check_bp_loc(unsigned long addr)
return 1;
}
static int find_free_data_bpt(void)
{
int i;
for (i = 0; i < nr_wp_slots(); i++) {
if (!dabr[i].enabled)
return i;
}
printf("Couldn't find free breakpoint register\n");
return -1;
}
static void print_data_bpts(void)
{
int i;
for (i = 0; i < nr_wp_slots(); i++) {
if (!dabr[i].enabled)
continue;
printf(" data "REG" [", dabr[i].address);
if (dabr[i].enabled & 1)
printf("r");
if (dabr[i].enabled & 2)
printf("w");
printf("]\n");
}
}
static char *breakpoint_help_string =
"Breakpoint command usage:\n"
"b show breakpoints\n"
@ -1399,10 +1438,9 @@ bpt_cmds(void)
printf("Hardware data breakpoint not supported on this cpu\n");
break;
}
if (dabr.enabled) {
printf("Couldn't find free breakpoint register\n");
i = find_free_data_bpt();
if (i < 0)
break;
}
mode = 7;
cmd = inchar();
if (cmd == 'r')
@ -1411,15 +1449,15 @@ bpt_cmds(void)
mode = 6;
else
termch = cmd;
dabr.address = 0;
dabr.enabled = 0;
if (scanhex(&dabr.address)) {
if (!is_kernel_addr(dabr.address)) {
dabr[i].address = 0;
dabr[i].enabled = 0;
if (scanhex(&dabr[i].address)) {
if (!is_kernel_addr(dabr[i].address)) {
printf(badaddr);
break;
}
dabr.address &= ~HW_BRK_TYPE_DABR;
dabr.enabled = mode | BP_DABR;
dabr[i].address &= ~HW_BRK_TYPE_DABR;
dabr[i].enabled = mode | BP_DABR;
}
force_enable_xmon();
@ -1458,7 +1496,9 @@ bpt_cmds(void)
for (i = 0; i < NBPTS; ++i)
bpts[i].enabled = 0;
iabr = NULL;
dabr.enabled = 0;
for (i = 0; i < nr_wp_slots(); i++)
dabr[i].enabled = 0;
printf("All breakpoints cleared\n");
break;
}
@ -1492,14 +1532,7 @@ bpt_cmds(void)
if (xmon_is_ro || !scanhex(&a)) {
/* print all breakpoints */
printf(" type address\n");
if (dabr.enabled) {
printf(" data "REG" [", dabr.address);
if (dabr.enabled & 1)
printf("r");
if (dabr.enabled & 2)
printf("w");
printf("]\n");
}
print_data_bpts();
for (bp = bpts; bp < &bpts[NBPTS]; ++bp) {
if (!bp->enabled)
continue;
@ -1959,8 +1992,13 @@ static void dump_207_sprs(void)
printf("hfscr = %.16lx dhdes = %.16lx rpr = %.16lx\n",
mfspr(SPRN_HFSCR), mfspr(SPRN_DHDES), mfspr(SPRN_RPR));
printf("dawr = %.16lx dawrx = %.16lx ciabr = %.16lx\n",
mfspr(SPRN_DAWR0), mfspr(SPRN_DAWRX0), mfspr(SPRN_CIABR));
printf("dawr0 = %.16lx dawrx0 = %.16lx\n",
mfspr(SPRN_DAWR0), mfspr(SPRN_DAWRX0));
if (nr_wp_slots() > 1) {
printf("dawr1 = %.16lx dawrx1 = %.16lx\n",
mfspr(SPRN_DAWR1), mfspr(SPRN_DAWRX1));
}
printf("ciabr = %.16lx\n", mfspr(SPRN_CIABR));
#endif
}
@ -3909,10 +3947,9 @@ static void clear_all_bpt(void)
bpts[i].enabled = 0;
/* Clear any data or iabr breakpoints */
if (iabr || dabr.enabled) {
iabr = NULL;
dabr.enabled = 0;
}
iabr = NULL;
for (i = 0; i < nr_wp_slots(); i++)
dabr[i].enabled = 0;
}
#ifdef CONFIG_DEBUG_FS