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- preserve cortex_m3 C_MASKINTS during resume/step

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git-svn-id: svn://svn.berlios.de/openocd/trunk@1179 b42882b7-edfa-0310-969c-e2dbd0fdcd60
This commit is contained in:
ntfreak 2008-11-20 11:17:47 +00:00
parent cca10e6534
commit e507bfddb0
2 changed files with 60 additions and 45 deletions
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5
src/target/armv7m.c
View File

@ -303,14 +303,14 @@ static int armv7m_run_and_wait(struct target_s *target, u32 entry_point, int tim
u32 pc;
int retval;
/* This code relies on the target specific resume() and poll()->debug_entry()
sequence to write register values to the processor and the read them back */
* sequence to write register values to the processor and the read them back */
if((retval = target_resume(target, 0, entry_point, 1, 1)) != ERROR_OK)
{
return retval;
}
retval = target_wait_state(target, TARGET_HALTED, timeout_ms);
// If the target fails to halt due to the breakpoint, force a halt
/* If the target fails to halt due to the breakpoint, force a halt */
if (retval != ERROR_OK || target->state != TARGET_HALTED)
{
if ((retval=target_halt(target))!=ERROR_OK)
@ -322,7 +322,6 @@ static int armv7m_run_and_wait(struct target_s *target, u32 entry_point, int tim
return ERROR_TARGET_TIMEOUT;
}
armv7m->load_core_reg_u32(target, ARMV7M_REGISTER_CORE_GP, 15, &pc);
if (pc != exit_point)
{

62
src/target/cortex_m3.c
View File

@ -100,6 +100,21 @@ target_type_t cortexm3_target =
.quit = cortex_m3_quit
};
int cortex_m3_write_debug_halt_mask(target_t *target, u32 mask_on, u32 mask_off)
{
/* get pointers to arch-specific information */
armv7m_common_t *armv7m = target->arch_info;
cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
/* mask off status bits */
cortex_m3->dcb_dhcsr &= ~((0xFFFF << 16) | mask_off);
/* create new register mask */
cortex_m3->dcb_dhcsr |= DBGKEY | C_DEBUGEN | mask_on;
return ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, cortex_m3->dcb_dhcsr);
}
int cortex_m3_clear_halt(target_t *target)
{
/* get pointers to arch-specific information */
@ -107,6 +122,9 @@ int cortex_m3_clear_halt(target_t *target)
cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
/* clear step if any */
cortex_m3_write_debug_halt_mask(target, C_HALT, C_STEP);
/* Read Debug Fault Status Register */
ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
/* Write Debug Fault Status Register to enable processing to resume ?? Try with and without this !! */
@ -122,12 +140,19 @@ int cortex_m3_single_step_core(target_t *target)
armv7m_common_t *armv7m = target->arch_info;
cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
u32 dhcsr_save;
/* backup dhcsr reg */
dhcsr_save = cortex_m3->dcb_dhcsr;
/* mask interrupts if not done already */
if (!(cortex_m3->dcb_dhcsr & C_MASKINTS))
ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_HALT | C_DEBUGEN);
ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_STEP | C_DEBUGEN);
cortex_m3->dcb_dhcsr |= C_MASKINTS;
LOG_DEBUG(" ");
/* restore dhcsr reg */
cortex_m3->dcb_dhcsr = dhcsr_save;
cortex_m3_clear_halt(target);
return ERROR_OK;
@ -181,12 +206,17 @@ int cortex_m3_endreset_event(target_t *target)
ahbap_read_system_atomic_u32(swjdp, DCB_DEMCR, &dcb_demcr);
LOG_DEBUG("DCB_DEMCR = 0x%8.8x",dcb_demcr);
/* this regsiter is used for emulated dcc channel */
ahbap_write_system_u32(swjdp, DCB_DCRDR, 0);
/* Enable debug requests */
ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN))
ahbap_write_system_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN);
/* clear any interrupt masking */
cortex_m3_write_debug_halt_mask(target, 0, C_MASKINTS);
/* Enable trace and dwt */
ahbap_write_system_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR);
/* Monitor bus faults */
@ -441,7 +471,7 @@ int cortex_m3_poll(target_t *target)
#if 0
/* Read Debug Fault Status Register, added to figure out the lockup when running flashtest.script */
ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
LOG_DEBUG("dcb_dhcsr 0x%x, nvic_dfsr 0x%x, target->state: %s", cortex_m3->dcb_dhcsr, cortex_m3->nvic_dfsr, Jim_Nvp_value2name( nvp_target_state, target->state )->name );
LOG_DEBUG("dcb_dhcsr 0x%x, nvic_dfsr 0x%x, target->state: %s", cortex_m3->dcb_dhcsr, cortex_m3->nvic_dfsr, Jim_Nvp_value2name_simple( nvp_target_state, target->state )->name );
#endif
return ERROR_OK;
@ -449,11 +479,6 @@ int cortex_m3_poll(target_t *target)
int cortex_m3_halt(target_t *target)
{
/* get pointers to arch-specific information */
armv7m_common_t *armv7m = target->arch_info;
cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
LOG_DEBUG("target->state: %s",
Jim_Nvp_value2name_simple(nvp_target_state, target->state )->name);
@ -487,7 +512,7 @@ int cortex_m3_halt(target_t *target)
}
/* Write to Debug Halting Control and Status Register */
ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN | C_HALT );
cortex_m3_write_debug_halt_mask(target, C_HALT, 0);
target->debug_reason = DBG_REASON_DBGRQ;
@ -539,10 +564,8 @@ int cortex_m3_resume(struct target_s *target, int current, u32 address, int hand
{
/* get pointers to arch-specific information */
armv7m_common_t *armv7m = target->arch_info;
cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
breakpoint_t *breakpoint = NULL;
u32 dcb_dhcsr, resume_pc;
u32 resume_pc;
if (target->state != TARGET_HALTED)
{
@ -555,16 +578,13 @@ int cortex_m3_resume(struct target_s *target, int current, u32 address, int hand
target_free_all_working_areas(target);
cortex_m3_enable_breakpoints(target);
cortex_m3_enable_watchpoints(target);
/* TODOLATER Interrupt handling/disable for debug execution, cache ... ... */
}
dcb_dhcsr = DBGKEY | C_DEBUGEN;
if (debug_execution)
{
/* Disable interrupts */
/* We disable interrupts in the PRIMASK register instead of masking with C_MASKINTS,
* This is probably the same inssue as Cortex-M3 Errata 377493:
* This is probably the same issue as Cortex-M3 Errata 377493:
* C_MASKINTS in parallel with disabled interrupts can cause local faults to not be taken. */
buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_PRIMASK].value, 0, 32, 1);
armv7m->core_cache->reg_list[ARMV7M_PRIMASK].dirty = 1;
@ -602,12 +622,9 @@ int cortex_m3_resume(struct target_s *target, int current, u32 address, int hand
}
}
/* Set/Clear C_MASKINTS in a separate operation */
if ((cortex_m3->dcb_dhcsr & C_MASKINTS) != (dcb_dhcsr & C_MASKINTS))
ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, dcb_dhcsr | C_HALT );
/* Restart core */
ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, dcb_dhcsr );
cortex_m3_write_debug_halt_mask(target, 0, C_HALT);
target->debug_reason = DBG_REASON_NOTHALTED;
/* registers are now invalid */
@ -658,9 +675,8 @@ int cortex_m3_step(struct target_s *target, int current, u32 address, int handle
target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
if (cortex_m3->dcb_dhcsr & C_MASKINTS)
ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_HALT | C_DEBUGEN );
ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY| C_STEP | C_DEBUGEN);
/* set step and clear halt */
cortex_m3_write_debug_halt_mask(target, C_STEP, C_HALT);
ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
/* registers are now invalid */