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author | Andreas Fritiofson <andreas.fritiofson@gmail.com> | 2012-08-22 19:42:02 +0200 |
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committer | Freddie Chopin <freddie.chopin@gmail.com> | 2012-08-29 06:23:47 +0000 |
commit | 0989cd4d5d69850df38122f9ba1e7d5b4009fb51 (patch) | |
tree | 53c16a14d8f5146b72f1ac79fdf76c2b8b717e0c /src/target/arm7tdmi.c | |
parent | 47728f92159e11668a4aa1ec3d2713ee38a87192 (diff) | |
download | riscv-openocd-0989cd4d5d69850df38122f9ba1e7d5b4009fb51.zip riscv-openocd-0989cd4d5d69850df38122f9ba1e7d5b4009fb51.tar.gz riscv-openocd-0989cd4d5d69850df38122f9ba1e7d5b4009fb51.tar.bz2 |
arm7_9: Fix broken halfword/byte memory reads
Always scan out all bits, but make sure only the allowed number of bytes
end up in the caller-provided buffer. Discard the rest by adding another
scan field when size < 4.
Rewrite the endianness callback to avoid reading outside allocated memory.
Make it directly usable as a callback without the need for a wrapper. Move
the shared callback to a more suitable home in arm7_9_common.
This fixes the regressions introduced in commits
991ed5a2b657e660f744eefddb084724e52938ea
cb90d32e386a7489d31136997209c61e9559ff5e
and
c3074f377c1da33ca8ba8493826e1b52351eebc6
Change-Id: Ia8bde8c5a9844e89a1d6c0bc8534cd26f02f8d11
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/789
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
Diffstat (limited to 'src/target/arm7tdmi.c')
-rw-r--r-- | src/target/arm7tdmi.c | 60 |
1 files changed, 19 insertions, 41 deletions
diff --git a/src/target/arm7tdmi.c b/src/target/arm7tdmi.c index 2721502..634aa29 100644 --- a/src/target/arm7tdmi.c +++ b/src/target/arm7tdmi.c @@ -168,40 +168,6 @@ static int arm7tdmi_clock_data_in(struct arm_jtag *jtag_info, uint32_t *in) return ERROR_OK; } -void arm_endianness(uint8_t *tmp, void *in, int size, int be, int flip) -{ - uint32_t readback = le_to_h_u32(tmp); - if (flip) - readback = flip_u32(readback, 32); - switch (size) { - case 4: - if (be) - h_u32_to_be(((uint8_t *)in), readback); - else - h_u32_to_le(((uint8_t *)in), readback); - break; - case 2: - if (be) - h_u16_to_be(((uint8_t *)in), readback & 0xffff); - else - h_u16_to_le(((uint8_t *)in), readback & 0xffff); - break; - case 1: - *((uint8_t *)in) = readback & 0xff; - break; - } -} - -static int arm7endianness(jtag_callback_data_t arg, - jtag_callback_data_t size, jtag_callback_data_t be, - jtag_callback_data_t captured) -{ - uint8_t *in = (uint8_t *)arg; - - arm_endianness((uint8_t *)captured, in, (int)size, (int)be, 1); - return ERROR_OK; -} - /* clock the target, and read the databus * the *in pointer points to a buffer where elements of 'size' bytes * are stored in big (be == 1) or little (be == 0) endianness @@ -210,7 +176,7 @@ static int arm7tdmi_clock_data_in_endianness(struct arm_jtag *jtag_info, void *in, int size, int be) { int retval = ERROR_OK; - struct scan_field fields[2]; + struct scan_field fields[3]; retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE); if (retval != ERROR_OK) @@ -223,17 +189,29 @@ static int arm7tdmi_clock_data_in_endianness(struct arm_jtag *jtag_info, fields[0].out_value = NULL; fields[0].in_value = NULL; - fields[1].num_bits = size * 8; - fields[1].out_value = NULL; - fields[1].in_value = in; + if (size == 4) { + fields[1].num_bits = 32; + fields[1].out_value = NULL; + fields[1].in_value = in; + } else { + /* Discard irrelevant bits of the scan, making sure we don't write more + * than size bytes to in */ + fields[1].num_bits = 32 - size * 8; + fields[1].out_value = NULL; + fields[1].in_value = NULL; - jtag_add_dr_scan(jtag_info->tap, 2, fields, TAP_DRPAUSE); + fields[2].num_bits = size * 8; + fields[2].out_value = NULL; + fields[2].in_value = in; + } + + jtag_add_dr_scan(jtag_info->tap, size == 4 ? 2 : 3, fields, TAP_DRPAUSE); - jtag_add_callback4(arm7endianness, + jtag_add_callback4(arm7_9_endianness_callback, (jtag_callback_data_t)in, (jtag_callback_data_t)size, (jtag_callback_data_t)be, - (jtag_callback_data_t)in); + (jtag_callback_data_t)1); jtag_add_runtest(0, TAP_DRPAUSE); |