cortex a9: merge cortex a9 and a8 code

better to keep this in a single file.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

src/target/Makefile.am

@@ -73,8 +73,7 @@ ARMV7_SRC = \
 	armv7m.c \
 	cortex_m3.c \
 	armv7a.c \
-	cortex_a8.c \
+	cortex_a8.c
-	cortex_a9.c
 
 ARM_DEBUG_SRC = \
 	arm_dpm.c \
@@ -137,7 +136,6 @@ noinst_HEADERS = \
 	breakpoints.h \
 	cortex_m3.h \
 	cortex_a8.h \
-	cortex_a9.h \
 	embeddedice.h \
 	etb.h \
 	etm.h \

src/target/cortex_a8.c

@@ -30,6 +30,7 @@
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  *                                                                         *
  *   Cortex-A8(tm) TRM, ARM DDI 0344H                                      *
+ *   Cortex-A9(tm) TRM, ARM DDI 0407F                                      *
  *                                                                         *
  ***************************************************************************/
 #ifdef HAVE_CONFIG_H
@@ -692,7 +693,7 @@ static int cortex_a8_poll(struct target *target)
 	}
 	cortex_a8->cpudbg_dscr = dscr;
 
-	if ((dscr & 0x3) == 0x3)
+	if (DSCR_RUN_MODE(dscr) == (DSCR_CORE_HALTED | DSCR_CORE_RESTARTED))
 	{
 		if (prev_target_state != TARGET_HALTED)
 		{
@@ -722,7 +723,7 @@ static int cortex_a8_poll(struct target *target)
 			}
 		}
 	}
-	else if ((dscr & 0x3) == 0x2)
+	else if (DSCR_RUN_MODE(dscr) == DSCR_CORE_RESTARTED)
 	{
 		target->state = TARGET_RUNNING;
 	}
@@ -747,7 +748,7 @@ static int cortex_a8_halt(struct target *target)
 	 * and then wait for the core to be halted.
 	 */
 	retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
-			armv7a->debug_base + CPUDBG_DRCR, 0x1);
+			armv7a->debug_base + CPUDBG_DRCR, DRCR_HALT);
 	if (retval != ERROR_OK)
 		return retval;
 
@@ -870,14 +871,30 @@ static int cortex_a8_resume(struct target *target, int current,
 	}
 
 #endif
-	/* Restart core and wait for it to be started
+
-	 * NOTE: this clears DSCR_ITR_EN and other bits.
+	/*
+	 * Restart core and wait for it to be started.  Clear ITRen and sticky
+	 * exception flags: see ARMv7 ARM, C5.9.
 	 *
 	 * REVISIT: for single stepping, we probably want to
 	 * disable IRQs by default, with optional override...
 	 */
+
+	retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+			armv7a->debug_base + CPUDBG_DSCR, &dscr);
+	if (retval != ERROR_OK)
+		return retval;
+
+	if ((dscr & DSCR_INSTR_COMP) == 0)
+		LOG_ERROR("DSCR InstrCompl must be set before leaving debug!");
+
 	retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
-			armv7a->debug_base + CPUDBG_DRCR, 0x2);
+		armv7a->debug_base + CPUDBG_DSCR, dscr & ~DSCR_ITR_EN);
+	if (retval != ERROR_OK)
+		return retval;
+
+	retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
+			armv7a->debug_base + CPUDBG_DRCR, DRCR_RESTART | DRCR_CLEAR_EXCEPTIONS);
 	if (retval != ERROR_OK)
 		return retval;
 
@@ -1446,12 +1463,16 @@ static int cortex_a8_read_phys_memory(struct target *target,
 	struct armv7a_common *armv7a = target_to_armv7a(target);
 	struct adiv5_dap *swjdp = &armv7a->dap;
 	int retval = ERROR_INVALID_ARGUMENTS;
+	uint8_t apsel = swjdp->apsel;
 
-        /* cortex_a8 handles unaligned memory access */
-
-// ???  dap_ap_select(swjdp, swjdp_memoryap);
 	LOG_DEBUG("Reading memory at real address 0x%x; size %d; count %d", address, size, count);
+
 	if (count && buffer) {
+
+		if ( apsel == swjdp_memoryap ) {
+
+			/* read memory through AHB-AP */
+
 			switch (size) {
 				case 4:
 					retval = mem_ap_sel_read_buf_u32(swjdp, swjdp_memoryap,
@@ -1466,6 +1487,71 @@ static int cortex_a8_read_phys_memory(struct target *target,
 							buffer, count, address);
 					break;
 			}
+
+		} else {
+
+			/* read memory through APB-AP */
+
+			uint32_t saved_r0, saved_r1;
+			int nbytes = count * size;
+			uint32_t data;
+			int enabled = 0;
+
+			if (target->state != TARGET_HALTED)
+			{
+				LOG_WARNING("target not halted");
+				return ERROR_TARGET_NOT_HALTED;
+			}
+
+			retval = cortex_a8_mmu(target, &enabled);
+			if (retval != ERROR_OK)
+				return retval;
+
+			if (enabled)
+			{
+				LOG_WARNING("Reading physical memory through APB with MMU enabled is not yet implemented");
+				return ERROR_TARGET_FAILURE;
+			}
+
+			/* save registers r0 and r1, we are going to corrupt them  */
+			retval = cortex_a8_dap_read_coreregister_u32(target, &saved_r0, 0);
+			if (retval != ERROR_OK)
+				return retval;
+
+			retval = cortex_a8_dap_read_coreregister_u32(target, &saved_r1, 1);
+			if (retval != ERROR_OK)
+				return retval;
+
+			retval = cortex_a8_dap_write_coreregister_u32(target, address, 0);
+			if (retval != ERROR_OK)
+				return retval;
+
+			while (nbytes > 0) {
+
+				/* execute instruction LDRB r1, [r0], 1 (0xe4d01001) */
+				retval = cortex_a8_exec_opcode(target, ARMV4_5_LDRB_IP(1, 0) , NULL);
+				if (retval != ERROR_OK)
+						return retval;
+
+				retval = cortex_a8_dap_read_coreregister_u32(target, &data, 1);
+				if (retval != ERROR_OK)
+					return retval;
+
+				*buffer++ = data;
+				--nbytes;
+
+			}
+
+			/* restore corrupted registers r0 and r1 */
+			retval = cortex_a8_dap_write_coreregister_u32(target, saved_r0, 0);
+			if (retval != ERROR_OK)
+				return retval;
+
+			retval = cortex_a8_dap_write_coreregister_u32(target, saved_r1, 1);
+			if (retval != ERROR_OK)
+				return retval;
+
+		}
 	}
 
 	return retval;
@@ -1480,7 +1566,6 @@ static int cortex_a8_read_memory(struct target *target, uint32_t address,
 
 	/* cortex_a8 handles unaligned memory access */
 
-// ???	dap_ap_select(swjdp, swjdp_memoryap);
         LOG_DEBUG("Reading memory at address 0x%x; size %d; count %d", address, size, count);
         retval = cortex_a8_mmu(target, &enabled);
         if (retval != ERROR_OK)
@@ -1507,11 +1592,16 @@ static int cortex_a8_write_phys_memory(struct target *target,
 	struct armv7a_common *armv7a = target_to_armv7a(target);
 	struct adiv5_dap *swjdp = &armv7a->dap;
 	int retval = ERROR_INVALID_ARGUMENTS;
-
+	uint8_t apsel = swjdp->apsel;
-// ???  dap_ap_select(swjdp, swjdp_memoryap);
 
 	LOG_DEBUG("Writing memory to real address 0x%x; size %d; count %d", address, size, count);
+
 	if (count && buffer) {
+
+		if ( apsel == swjdp_memoryap ) {
+
+			/* write memory through AHB-AP */
+
 			switch (size) {
 				case 4:
 					retval = mem_ap_sel_write_buf_u32(swjdp, swjdp_memoryap,
@@ -1526,8 +1616,77 @@ static int cortex_a8_write_phys_memory(struct target *target,
 							buffer, count, address);
 					break;
 			}
+
+		} else {
+
+			/* write memory through APB-AP */
+
+			uint32_t saved_r0, saved_r1;
+			int nbytes = count * size;
+			uint32_t data;
+			int enabled = 0;
+
+			if (target->state != TARGET_HALTED)
+			{
+				LOG_WARNING("target not halted");
+				return ERROR_TARGET_NOT_HALTED;
 			}
 
+			retval = cortex_a8_mmu(target, &enabled);
+			if (retval != ERROR_OK)
+				return retval;
+
+			if (enabled)
+			{
+				LOG_WARNING("Writing physical memory through APB with MMU enabled is not yet implemented");
+				return ERROR_TARGET_FAILURE;
+			}
+
+			/* save registers r0 and r1, we are going to corrupt them  */
+			retval = cortex_a8_dap_read_coreregister_u32(target, &saved_r0, 0);
+			if (retval != ERROR_OK)
+				return retval;
+
+			retval = cortex_a8_dap_read_coreregister_u32(target, &saved_r1, 1);
+			if (retval != ERROR_OK)
+				return retval;
+
+			retval = cortex_a8_dap_write_coreregister_u32(target, address, 0);
+			if (retval != ERROR_OK)
+				return retval;
+
+			while (nbytes > 0) {
+
+				data = *buffer++;
+
+				retval = cortex_a8_dap_write_coreregister_u32(target, data, 1);
+				if (retval != ERROR_OK)
+					return retval;
+
+					/* execute instruction STRB r1, [r0], 1 (0xe4c01001) */
+				retval = cortex_a8_exec_opcode(target, ARMV4_5_STRB_IP(1, 0) , NULL);
+				if (retval != ERROR_OK)
+						return retval;
+
+				--nbytes;
+			}
+
+			/* restore corrupted registers r0 and r1 */
+			retval = cortex_a8_dap_write_coreregister_u32(target, saved_r0, 0);
+			if (retval != ERROR_OK)
+				return retval;
+
+			retval = cortex_a8_dap_write_coreregister_u32(target, saved_r1, 1);
+			if (retval != ERROR_OK)
+				return retval;
+
+			/* we can return here without invalidating D/I-cache because */
+			/* access through APB maintains cache coherency              */
+			return retval;
+		}
+	}
+
+
 	/* REVISIT this op is generic ARMv7-A/R stuff */
 	if (retval == ERROR_OK && target->state == TARGET_HALTED)
 	{
@@ -1595,8 +1754,6 @@ static int cortex_a8_write_memory(struct target *target, uint32_t address,
         uint32_t virt, phys;
         int retval;
 
-// ???  dap_ap_select(swjdp, swjdp_memoryap);
-
         LOG_DEBUG("Writing memory to address 0x%x; size %d; count %d", address, size, count);
         retval = cortex_a8_mmu(target, &enabled);
         if (retval != ERROR_OK)
@@ -1724,6 +1881,21 @@ static int cortex_a8_examine_first(struct target *target)
 	if (retval != ERROR_OK)
 		return retval;
 
+#if 0
+	/*
+	 * FIXME: assuming omap4430
+	 *
+	 * APB DBGBASE reads 0x80040000, but this points to an empty ROM table.
+	 * 0x80000000 is cpu0 coresight region
+	 */
+	if (target->coreid > 3) {
+		LOG_ERROR("cortex_a8 supports up to 4 cores");
+		return ERROR_INVALID_ARGUMENTS;
+	}
+	armv7a->debug_base = 0x80000000 |
+			((target->coreid & 0x3) << CORTEX_A8_PADDRDBG_CPU_SHIFT);
+#endif
+
 	retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
 			armv7a->debug_base + CPUDBG_CPUID, &cpuid);
 	if (retval != ERROR_OK)

src/target/cortex_a8.h

@@ -33,7 +33,6 @@
 
 #define CORTEX_A8_COMMON_MAGIC 0x411fc082
 
-/* See Cortex-A8 TRM section 12.5 */
 #define CPUDBG_CPUID	0xD00
 #define CPUDBG_CTYPR	0xD04
 #define CPUDBG_TTYPR	0xD0C
@@ -43,6 +42,8 @@
 #define BRP_NORMAL 0
 #define BRP_CONTEXT 1
 
+#define CORTEX_A8_PADDRDBG_CPU_SHIFT 13
+
 struct cortex_a8_brp
 {
 	int used;

src/target/cortex_a9.h

@@ -1,89 +0,0 @@
-/***************************************************************************
- *   Copyright (C) 2005 by Dominic Rath                                    *
- *   Dominic.Rath@gmx.de                                                   *
- *                                                                         *
- *   Copyright (C) 2006 by Magnus Lundin                                   *
- *   lundin@mlu.mine.nu                                                    *
- *                                                                         *
- *   Copyright (C) 2008 by Spencer Oliver                                  *
- *   spen@spen-soft.co.uk                                                  *
- *                                                                         *
- *   Copyright (C) 2009 by Dirk Behme                                      *
- *   dirk.behme@gmail.com - copy from cortex_m3                            *
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- *   This program is distributed in the hope that it will be useful,       *
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
- *   GNU General Public License for more details.                          *
- *                                                                         *
- *   You should have received a copy of the GNU General Public License     *
- *   along with this program; if not, write to the                         *
- *   Free Software Foundation, Inc.,                                       *
- *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
- ***************************************************************************/
-#ifndef CORTEX_A9_H
-#define CORTEX_A9_H
-
-#include "armv7a.h"
-
-#define CORTEX_A9_COMMON_MAGIC 0x411fc082
-
-#define CPUDBG_CPUID	0xD00
-#define CPUDBG_CTYPR	0xD04
-#define CPUDBG_TTYPR	0xD0C
-#define CPUDBG_LOCKACCESS 0xFB0
-#define CPUDBG_LOCKSTATUS 0xFB4
-
-#define BRP_NORMAL 0
-#define BRP_CONTEXT 1
-
-#define CORTEX_A9_PADDRDBG_CPU_SHIFT 13
-
-struct cortex_a9_brp
-{
-	int used;
-	int type;
-	uint32_t value;
-	uint32_t control;
-	uint8_t BRPn;
-};
-
-struct cortex_a9_common
-{
-	int common_magic;
-	struct arm_jtag jtag_info;
-
-	/* Context information */
-	uint32_t cpudbg_dscr;
-
-	/* Saved cp15 registers */
-	uint32_t cp15_control_reg;
-
-	/* Breakpoint register pairs */
-	int brp_num_context;
-	int brp_num;
-	int brp_num_available;
-	struct cortex_a9_brp *brp_list;
-
-	/* Use cortex_a9_read_regs_through_mem for fast register reads */
-	int fast_reg_read;
-
-	/* Flag that helps to resolve what ttb to use: user or kernel */
-	int current_address_mode;
-
-	struct armv7a_common armv7a_common;
-};
-
-static inline struct cortex_a9_common *
-target_to_cortex_a9(struct target *target)
-{
-	return container_of(target->arch_info, struct cortex_a9_common,
-			armv7a_common.armv4_5_common);
-}
-
-#endif /* CORTEX_A9_H */

src/target/target.c

@@ -70,7 +70,6 @@ extern struct target_type dragonite_target;
 extern struct target_type xscale_target;
 extern struct target_type cortexm3_target;
 extern struct target_type cortexa8_target;
-extern struct target_type cortexa9_target;
 extern struct target_type arm11_target;
 extern struct target_type mips_m4k_target;
 extern struct target_type avr_target;
@@ -93,7 +92,6 @@ static struct target_type *target_types[] =
 	&xscale_target,
 	&cortexm3_target,
 	&cortexa8_target,
-	&cortexa9_target,
 	&arm11_target,
 	&mips_m4k_target,
 	&avr_target,