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authorGareth McMullin2015-03-08 22:43:12 -0700
committerGareth McMullin2015-03-19 21:49:09 -0700
commitacfd258aa7b02ea23a6d26c29c3432bf3e857039 (patch)
treed4d23b80985c1fe9ddbe05eefaab1f5ba724c883
parent8ddb186b35267e90832deb2db4b0c58f77de4b87 (diff)
Rewrite STM32F4 stub in C and use new interface.
-rw-r--r--flashstub/Makefile6
-rw-r--r--flashstub/stm32f4.c40
-rw-r--r--flashstub/stm32f4.s44
-rw-r--r--flashstub/stm32f4.stub1
-rw-r--r--src/stm32f4.c78
5 files changed, 62 insertions, 107 deletions
diff --git a/flashstub/Makefile b/flashstub/Makefile
index eeb1803..c955ca8 100644
--- a/flashstub/Makefile
+++ b/flashstub/Makefile
@@ -8,7 +8,7 @@ ifneq ($(V), 1)
Q = @
endif
-CFLAGS=-mcpu=cortex-m3 -mthumb -I../libopencm3/include
+CFLAGS=-Os -std=gnu99 -mcpu=cortex-m3 -mthumb -I../libopencm3/include
ASFLAGS=-mcpu=cortex-m3 -mthumb
all: lmi.stub stm32f4.stub nrf51.stub stm32f1.stub
@@ -17,6 +17,10 @@ stm32f1.o: stm32f1.c
$(Q)echo " CC $<"
$(Q)$(CC) $(CFLAGS) -DSTM32F1 -o $@ -c $<
+stm32f4.o: stm32f4.c
+ $(Q)echo " CC $<"
+ $(Q)$(CC) $(CFLAGS) -DSTM32F4 -o $@ -c $<
+
%.o: %.s
$(Q)echo " AS $<"
$(Q)$(AS) $(ASFLAGS) -o $@ $<
diff --git a/flashstub/stm32f4.c b/flashstub/stm32f4.c
new file mode 100644
index 0000000..6732897
--- /dev/null
+++ b/flashstub/stm32f4.c
@@ -0,0 +1,40 @@
+/*
+ * This file is part of the Black Magic Debug project.
+ *
+ * Copyright (C) 2015 Black Sphere Technologies Ltd.
+ * Written by Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+#include "libopencm3/stm32/flash.h"
+#include "stub.h"
+
+#define SR_ERROR_MASK 0xF2
+
+void __attribute__((naked))
+stm32f4_flash_write_stub(uint32_t *dest, uint32_t *src, uint32_t size)
+{
+ for (int i = 0; i < size; i += 4) {
+ FLASH_CR = FLASH_CR_PROGRAM_X32 | FLASH_CR_PG;
+ *dest++ = *src++;
+ while (FLASH_SR & FLASH_SR_BSY)
+ ;
+ }
+
+ if (FLASH_SR & SR_ERROR_MASK)
+ stub_exit(1);
+
+ stub_exit(0);
+}
+
diff --git a/flashstub/stm32f4.s b/flashstub/stm32f4.s
deleted file mode 100644
index fa3fda0..0000000
--- a/flashstub/stm32f4.s
+++ /dev/null
@@ -1,44 +0,0 @@
-.global _start
-
-_start:
- ldr r0, _flashbase
- ldr r1, _addr
- mov r2, pc
- add r2, #(_data - . - 2)
- ldr r3, _size
- ldr r5, _cr
-_next:
- cbz r3, _done
- @ Write PG command to FLASH_CR
- str r5, [r0, #0x10]
- @ Write data to flash (word)
- ldr r4, [r2]
- str r4, [r1]
-
-_wait: @ Wait for BSY bit to clear
- ldrh r4, [r0, #0x0E]
- mov r6, #1
- tst r4, r6
- bne _wait
-
- sub r3, #4
- add r1, #4
- add r2, #4
- b _next
-_done:
- bkpt
-
-@.align 4
-.org 0x28
-_cr:
- .word 0x00000201
-_flashbase:
- .word 0x40023C00
-_addr:
- .word 0x0800bf78
-_size:
- .word 8
-_data:
- .word 0xAAAAAAAA
- .word 0xBBBBBBBB
- .word 0xCCCCCCCC
diff --git a/flashstub/stm32f4.stub b/flashstub/stm32f4.stub
new file mode 100644
index 0000000..25b5d9a
--- /dev/null
+++ b/flashstub/stm32f4.stub
@@ -0,0 +1 @@
+0x2300, 0x4293, 0x4C09, 0xD20B, 0x4D09, 0xF240, 0x2601, 0x602E, 0x58CD, 0x50C5, 0x6825, 0xF415, 0x3F80, 0xD1FB, 0x3304, 0xE7F0, 0x6823, 0xF013, 0x0FF2, 0xD000, 0xBE01, 0xBE00, 0x3C0C, 0x4002, 0x3C10, 0x4002, \ No newline at end of file
diff --git a/src/stm32f4.c b/src/stm32f4.c
index 2a8bc21..fe844ca 100644
--- a/src/stm32f4.c
+++ b/src/stm32f4.c
@@ -33,6 +33,7 @@
#include "general.h"
#include "adiv5.h"
#include "target.h"
+#include "cortexm.h"
#include "command.h"
#include "gdb_packet.h"
@@ -120,44 +121,12 @@ static const char stm32f4_xml_memory_map[] = "<?xml version=\"1.0\"?>"
/* This routine is uses word access. Only usable on target voltage >2.7V */
static const uint16_t stm32f4_flash_write_stub[] = {
-// _start:
- 0x480a, // ldr r0, [pc, #40] // _flashbase
- 0x490b, // ldr r1, [pc, #44] // _addr
- 0x467a, // mov r2, pc
- 0x3230, // adds r2, #48
- 0x4b0a, // ldr r3, [pc, #36] // _size
- 0x4d07, // ldr r5, [pc, #28] // _cr
-// _next:
- 0xb153, // cbz r3, _done
- 0x6105, // str r5, [r0, #16]
- 0x6814, // ldr r4, [r2]
- 0x600c, // str r4, [r1]
-// _wait:
- 0x89c4, // ldrb r4, [r0, #14]
- 0x2601, // movs r6, #1
- 0x4234, // tst r4, r6
- 0xd1fb, // bne _wait
-
- 0x3b04, // subs r3, #4
- 0x3104, // adds r1, #4
- 0x3204, // adds r2, #4
- 0xe7f3, // b _next
-// _done:
- 0xbe00, // bkpt
- 0x0000,
-// .org 0x28
-//_cr:
- 0x0201, 0x0000, //.word 0x00000201 (Value to write to FLASH_CR) */
-// _flashbase:
- 0x3c00, 0x4002, // .word 0x40023c00 (FPEC_BASE)
-// _addr:
-// 0x0000, 0x0000,
-// _size:
-// 0x0000, 0x0000,
-// _data:
-// ...
+#include "../flashstub/stm32f4.stub"
};
+#define SRAM_BASE 0x20000000
+#define STUB_BUFFER_BASE ALIGN(SRAM_BASE + sizeof(stm32f4_flash_write_stub), 4)
+
bool stm32f4_probe(struct target_s *target)
{
uint32_t idcode;
@@ -239,34 +208,19 @@ static int stm32f4_flash_write(struct target_s *target, uint32_t dest,
const uint8_t *src, size_t len)
{
uint32_t offset = dest % 4;
- uint32_t words = (offset + len + 3) / 4;
- uint32_t data[2 + words];
- uint16_t sr;
+ uint8_t data[ALIGN(offset + len, 4)];
/* Construct data buffer used by stub */
- data[0] = dest - offset;
- data[1] = words * 4; /* length must always be a multiple of 4 */
- data[2] = 0xFFFFFFFF; /* pad partial words with all 1s to avoid */
- data[words + 1] = 0xFFFFFFFF; /* damaging overlapping areas */
- memcpy((uint8_t *)&data[2] + offset, src, len);
-
- /* Write stub and data to target ram and set PC */
- target_mem_write(target, 0x20000000, stm32f4_flash_write_stub, 0x30);
- target_mem_write(target, 0x20000030, data, sizeof(data));
- target_pc_write(target, 0x20000000);
- if(target_check_error(target))
- return -1;
-
- /* Execute the stub */
- target_halt_resume(target, 0);
- while(!target_halt_wait(target));
-
- /* Check for error */
- sr = target_mem_read32(target, FLASH_SR);
- if(sr & SR_ERROR_MASK)
- return -1;
-
- return 0;
+ /* pad partial words with all 1s to avoid damaging overlapping areas */
+ memset(data, 0xff, sizeof(data));
+ memcpy((uint8_t *)data + offset, src, len);
+
+ /* Write buffer to target ram call stub */
+ target_mem_write(target, STUB_BUFFER_BASE, data, sizeof(data));
+ return cortexm_run_stub(target, SRAM_BASE, stm32f4_flash_write_stub,
+ sizeof(stm32f4_flash_write_stub),
+ dest - offset, STUB_BUFFER_BASE, sizeof(data),
+ 0);
}
static bool stm32f4_cmd_erase_mass(target *t)