diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/target/cortex_a.c | 41 |
1 files changed, 37 insertions, 4 deletions
diff --git a/src/target/cortex_a.c b/src/target/cortex_a.c index b3a8a41d..3ed2481b 100644 --- a/src/target/cortex_a.c +++ b/src/target/cortex_a.c @@ -1893,7 +1893,8 @@ static int cortex_a_write_cpu_memory_slow(struct target *target, { /* Writes count objects of size size from *buffer. Old value of DSCR must * be in *dscr; updated to new value. This is slow because it works for - * non-word-sized objects and (maybe) unaligned accesses. If size == 4 and + * non-word-sized objects. Avoid unaligned accesses as they do not work + * on memory address space without "Normal" attribute. If size == 4 and * the address is aligned, cortex_a_write_cpu_memory_fast should be * preferred. * Preconditions: @@ -2050,7 +2051,22 @@ static int cortex_a_write_cpu_memory(struct target *target, /* We are doing a word-aligned transfer, so use fast mode. */ retval = cortex_a_write_cpu_memory_fast(target, count, buffer, &dscr); } else { - /* Use slow path. */ + /* Use slow path. Adjust size for aligned accesses */ + switch (address % 4) { + case 1: + case 3: + count *= size; + size = 1; + break; + case 2: + if (size == 4) { + count *= 2; + size = 2; + } + case 0: + default: + break; + } retval = cortex_a_write_cpu_memory_slow(target, size, count, buffer, &dscr); } @@ -2136,7 +2152,8 @@ static int cortex_a_read_cpu_memory_slow(struct target *target, { /* Reads count objects of size size into *buffer. Old value of DSCR must be * in *dscr; updated to new value. This is slow because it works for - * non-word-sized objects and (maybe) unaligned accesses. If size == 4 and + * non-word-sized objects. Avoid unaligned accesses as they do not work + * on memory address space without "Normal" attribute. If size == 4 and * the address is aligned, cortex_a_read_cpu_memory_fast should be * preferred. * Preconditions: @@ -2352,7 +2369,23 @@ static int cortex_a_read_cpu_memory(struct target *target, /* We are doing a word-aligned transfer, so use fast mode. */ retval = cortex_a_read_cpu_memory_fast(target, count, buffer, &dscr); } else { - /* Use slow path. */ + /* Use slow path. Adjust size for aligned accesses */ + switch (address % 4) { + case 1: + case 3: + count *= size; + size = 1; + break; + case 2: + if (size == 4) { + count *= 2; + size = 2; + } + break; + case 0: + default: + break; + } retval = cortex_a_read_cpu_memory_slow(target, size, count, buffer, &dscr); } |