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author | Ravi Bangoria <ravi.bangoria@linux.ibm.com> | 2020-05-14 13:17:41 +0200 |
---|---|---|
committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-18 16:14:45 +0200 |
commit | 30df74d67d48949da87e3a5b57c381763e8fd526 (patch) | |
tree | 370fa310f6fb8c11f8584545ba2cdc89db66aaff /arch/powerpc/xmon/xmon.c | |
parent | powerpc/watchpoint/xmon: Don't allow breakpoint overwriting (diff) | |
download | linux-30df74d67d48949da87e3a5b57c381763e8fd526.tar.xz linux-30df74d67d48949da87e3a5b57c381763e8fd526.zip |
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
Diffstat (limited to 'arch/powerpc/xmon/xmon.c')
-rw-r--r-- | arch/powerpc/xmon/xmon.c | 101 |
1 files changed, 69 insertions, 32 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index 094bf4715f2c..de585204d1d2 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -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 |