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arm7_9: Avoid infinite loops in bulk write dispatching

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Add a mandatory field in struct arm7_9_common for regular, non-optimized
memory writes. Together with the existing bulk_memory_write field, this
allows variants to select any combination of implementations for regular
and bulk writes, without risking infinite loops from accidentally using
bulk writes for implementing bulk writes.

ARM 7/9 targets may now select arm7_9_memory_write_opt as their
target.write_memory implementation, which will dispatch to
arm7_9_common.bulk_write_memory if possible, or fallback to
arm7_9_common.write_memory otherwise.

To avoid loops, bulk write implementations mustn't call any other
functions than arm7_9_write_memory_no_opt() to write memory; it will
unconditionally call arm7_9_common.write_memory. If they fail, they should
simply return error to allow the caller to fallback to regular writes.

Tested on a regular ARM7TDMI only.

Change-Id: Iae42a6e093e2df68c4823c927d757ae8f42ef388
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/1685
Tested-by: jenkins
Reviewed-by: Sergey A. Borshch <sb-sf@users.sourceforge.net>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
This commit is contained in:
Andreas Fritiofson
2013-10-05 00:19:08 +02:00
committed by Spencer Oliver
parent 8e6e7948de
commit ff5ec942d8
10 changed files with 61 additions and 42 deletions
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13
src/target/arm926ejs.c
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@@ -656,17 +656,6 @@ int arm926ejs_write_memory(struct target *target, uint32_t address,
return retval;
}
int arm926ejs_write_memory_opt(struct target *target, uint32_t address,
uint32_t size, uint32_t count, const uint8_t *buffer)
{
struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
if (size == 4 && count > 32 && arm7_9->bulk_write_memory)
return arm7_9->bulk_write_memory(target, address, count, buffer);
else
return arm926ejs_write_memory(target, address, size, count, buffer);
}
static int arm926ejs_write_phys_memory(struct target *target,
uint32_t address, uint32_t size,
uint32_t count, const uint8_t *buffer)
@@ -819,7 +808,7 @@ struct target_type arm926ejs_target = {
.get_gdb_reg_list = arm_get_gdb_reg_list,
.read_memory = arm7_9_read_memory,
.write_memory = arm926ejs_write_memory_opt,
.write_memory = arm7_9_write_memory_opt,
.checksum_memory = arm_checksum_memory,
.blank_check_memory = arm_blank_check_memory,