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arm_adi_v5: Fix packed transfers crossing TAR auto-increment block 

The word count returned from max_tar_block_size() was compared with the
count of half-word/bytes in the u16 and u8 packed access functions,
causing an infinite loop if the access actually crossed the boundary.

Change max_tar_block_size() to return a byte count, and scale at the call
site.

Change-Id: I2fe9b5941eb485f3d8219cfdd29fb71e02006de4
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/1649
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
__archive__
Andreas Fritiofson 2013-09-22 23:14:17 +02:00 committed by Spencer Oliver
parent 2ab5d672ea
commit 23fb298651
1 changed files with 5 additions and 6 deletions
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11
src/target/arm_adi_v5.c
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@ -82,7 +82,7 @@
*/
static uint32_t max_tar_block_size(uint32_t tar_autoincr_block, uint32_t address)
{
return (tar_autoincr_block - ((tar_autoincr_block - 1) & address)) >> 2;
return tar_autoincr_block - ((tar_autoincr_block - 1) & address);
}
/***************************************************************************
@ -271,7 +271,7 @@ int mem_ap_write_buf_u32(struct adiv5_dap *dap, const uint8_t *buffer, int count
while (wcount > 0) {
/* Adjust to write blocks within boundaries aligned to the TAR auto-increment size */
blocksize = max_tar_block_size(dap->tar_autoincr_block, address);
blocksize = max_tar_block_size(dap->tar_autoincr_block, address) / 4;
if (wcount < blocksize)
blocksize = wcount;
@ -324,7 +324,7 @@ static int mem_ap_write_buf_packed_u16(struct adiv5_dap *dap,
int nbytes;
/* Adjust to write blocks within boundaries aligned to the TAR auto-increment size */
blocksize = max_tar_block_size(dap->tar_autoincr_block, address);
blocksize = max_tar_block_size(dap->tar_autoincr_block, address) / 2;
if (wcount < blocksize)
blocksize = wcount;
@ -534,8 +534,7 @@ int mem_ap_read_buf_u32(struct adiv5_dap *dap, uint8_t *buffer,
* TAR autoincrement size (at least 2^10). Autoincrement
* mode avoids an extra per-word roundtrip to update TAR.
*/
blocksize = max_tar_block_size(dap->tar_autoincr_block,
address);
blocksize = max_tar_block_size(dap->tar_autoincr_block, address) / 4;
if (wcount < blocksize)
blocksize = wcount;
@ -601,7 +600,7 @@ static int mem_ap_read_buf_packed_u16(struct adiv5_dap *dap,
int nbytes;
/* Adjust to read blocks within boundaries aligned to the TAR autoincremnent size*/
blocksize = max_tar_block_size(dap->tar_autoincr_block, address);
blocksize = max_tar_block_size(dap->tar_autoincr_block, address) / 2;
if (wcount < blocksize)
blocksize = wcount;