From 42097baf19d4459a57f5224506e59a8347740f19 Mon Sep 17 00:00:00 2001 From: Antonio Borneo Date: Thu, 12 Jul 2018 16:15:45 +0200 Subject: [PATCH] armv7a: read ttbcr and ttb0/1 at every entry in debug state Commit bfc5c764df145f68835543119865eabe462e19c2 avoids reading ttbcr and ttb0/1 at every virt2phys translation by caching them, and it updates the cached values in armv7a_arch_state(). But the purpose of any (*arch_state)() method, thus including armv7a_arch_state(), is to only print out and inform the user about some architecture specific status. Moreover, to reduce the verbosity during a GDB session, the method (*arch_state)() is not executed anymore at debug state entry (check use of target->verbose_halt_msg in src/openocd.c), thus the state of translation table gets out-of-sync triggering Error: Address translation failure or even using a wrong address in the memory R/W operation. In addition, the commit above breaks the case of armv7r by calling armv7a_read_ttbcr() unconditionally. Fixed by moving in cortex_a_post_debug_entry() the call to armv7a_read_ttbcr() on armv7a case only. Remove the call to armv7a_read_ttbcr() in armv7a_identify_cache() since it is (conditionally) called only in the same procedure cortex_a_post_debug_entry(). Fixes: bfc5c764df14 ("armv7a: cache ttbcr and ttb0/1 on debug state entry") Change-Id: Ifc20eca190111832e339a01b7f85d28c1547c8ba Signed-off-by: Antonio Borneo Reviewed-on: http://openocd.zylin.com/4601 Tested-by: jenkins Reviewed-by: Matthias Welwarsky --- src/target/armv7a.c | 7 +------ src/target/armv7a.h | 1 + src/target/cortex_a.c | 3 +++ 3 files changed, 5 insertions(+), 6 deletions(-) diff --git a/src/target/armv7a.c b/src/target/armv7a.c index fab73631..eecfa709 100644 --- a/src/target/armv7a.c +++ b/src/target/armv7a.c @@ -124,7 +124,7 @@ done: return retval; } -static int armv7a_read_ttbcr(struct target *target) +int armv7a_read_ttbcr(struct target *target) { struct armv7a_common *armv7a = target_to_armv7a(target); struct arm_dpm *dpm = armv7a->arm.dpm; @@ -554,9 +554,6 @@ int armv7a_identify_cache(struct target *target) struct armv7a_cache_common *cache = &(armv7a->armv7a_mmu.armv7a_cache); - if (!armv7a->is_armv7r) - armv7a_read_ttbcr(target); - retval = dpm->prepare(dpm); if (retval != ERROR_OK) goto done; @@ -729,8 +726,6 @@ int armv7a_arch_state(struct target *target) arm_arch_state(target); - armv7a_read_ttbcr(target); - if (armv7a->is_armv7r) { LOG_USER("D-Cache: %s, I-Cache: %s", state[armv7a->armv7a_mmu.armv7a_cache.d_u_cache_enabled], diff --git a/src/target/armv7a.h b/src/target/armv7a.h index 33f6f5db..57779c61 100644 --- a/src/target/armv7a.h +++ b/src/target/armv7a.h @@ -194,6 +194,7 @@ int armv7a_mmu_translate_va(struct target *target, uint32_t va, uint32_t *val); int armv7a_handle_cache_info_command(struct command_context *cmd_ctx, struct armv7a_cache_common *armv7a_cache); +int armv7a_read_ttbcr(struct target *target); extern const struct command_registration armv7a_command_handlers[]; diff --git a/src/target/cortex_a.c b/src/target/cortex_a.c index 8985051e..21ce4fae 100644 --- a/src/target/cortex_a.c +++ b/src/target/cortex_a.c @@ -1297,6 +1297,9 @@ static int cortex_a_post_debug_entry(struct target *target) LOG_DEBUG("cp15_control_reg: %8.8" PRIx32, cortex_a->cp15_control_reg); cortex_a->cp15_control_reg_curr = cortex_a->cp15_control_reg; + if (!armv7a->is_armv7r) + armv7a_read_ttbcr(target); + if (armv7a->armv7a_mmu.armv7a_cache.info == -1) armv7a_identify_cache(target); -- 2.39.5