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target-arm: Use attribute info to handle user-only watchpoints

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Now that we have memory access attribute information in the watchpoint
checking code, we can correctly implement handling of watchpoints
which should match only on userspace accesses, where LDRT/STRT/LDT/STT
from EL1 are treated as userspace accesses.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
This commit is contained in:
Peter Maydell 2015-04-26 16:49:25 +01:00
parent 0995bf8cd9
commit 9e1fc5bdfd
1 changed files with 12 additions and 11 deletions
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23
target-arm/op_helper.c
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@ -602,13 +602,22 @@ static bool bp_wp_matches(ARMCPU *cpu, int n, bool is_wp)
int pac, hmc, ssc, wt, lbn;
/* TODO: check against CPU security state when we implement TrustZone */
bool is_secure = false;
int access_el = arm_current_el(env);
if (is_wp) {
if (!env->cpu_watchpoint[n]
|| !(env->cpu_watchpoint[n]->flags & BP_WATCHPOINT_HIT)) {
CPUWatchpoint *wp = env->cpu_watchpoint[n];
if (!wp || !(wp->flags & BP_WATCHPOINT_HIT)) {
return false;
}
cr = env->cp15.dbgwcr[n];
if (wp->hitattrs.user) {
/* The LDRT/STRT/LDT/STT "unprivileged access" instructions should
* match watchpoints as if they were accesses done at EL0, even if
* the CPU is at EL1 or higher.
*/
access_el = 0;
}
} else {
uint64_t pc = is_a64(env) ? env->pc : env->regs[15];
@ -649,15 +658,7 @@ static bool bp_wp_matches(ARMCPU *cpu, int n, bool is_wp)
break;
}
/* TODO: this is not strictly correct because the LDRT/STRT/LDT/STT
* "unprivileged access" instructions should match watchpoints as if
* they were accesses done at EL0, even if the CPU is at EL1 or higher.
* Implementing this would require reworking the core watchpoint code
* to plumb the mmu_idx through to this point. Luckily Linux does not
* rely on this behaviour currently.
* For breakpoints we do want to use the current CPU state.
*/
switch (arm_current_el(env)) {
switch (access_el) {
case 3:
case 2:
if (!hmc) {