Bugfixes in mips32_pracc.c

When testing a pic32mx220f032b with different values
for adapter_khz and cpu clocks i was getting a lot of
corrupted data from the chip. From time to time
openocd fails with segmentation faults or is aborted
due to memory corruption.

Change-Id: I134743f75c477b3d55dc74ae4474598e153b4a4a
Signed-off-by: Salvador Arroyo <sarroyofdez@yahoo.es>
Reviewed-on: http://openocd.zylin.com/690
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>

diff --git a/src/target/mips32_pracc.c b/src/target/mips32_pracc.c
index abf12e02219ce76c5036d825482bedf565f4d661..92b8699e0e21fe93bc1b6e89acaac3633561357b 100644 (file)
--- a/src/target/mips32_pracc.c
+++ b/src/target/mips32_pracc.c
@@ -153,18 +153,22 @@ static int mips32_pracc_exec_read(struct mips32_pracc_context *ctx, uint32_t add
        uint32_t ejtag_ctrl, data;
 
        if ((address >= MIPS32_PRACC_PARAM_IN)
-               && (address <= MIPS32_PRACC_PARAM_IN + ctx->num_iparam * 4)) {
+               && (address < MIPS32_PRACC_PARAM_IN + ctx->num_iparam * 4)) {
                offset = (address - MIPS32_PRACC_PARAM_IN) / 4;
                data = ctx->local_iparam[offset];
        } else if ((address >= MIPS32_PRACC_PARAM_OUT)
-               && (address <= MIPS32_PRACC_PARAM_OUT + ctx->num_oparam * 4)) {
+               && (address < MIPS32_PRACC_PARAM_OUT + ctx->num_oparam * 4)) {
                offset = (address - MIPS32_PRACC_PARAM_OUT) / 4;
                data = ctx->local_oparam[offset];
        } else if ((address >= MIPS32_PRACC_TEXT)
-               && (address <= MIPS32_PRACC_TEXT + ctx->code_len * 4)) {
+               && (address < MIPS32_PRACC_TEXT + ctx->code_len * 4)) {
                offset = (address - MIPS32_PRACC_TEXT) / 4;
                data = ctx->code[offset];
        } else if (address == MIPS32_PRACC_STACK) {
+               if (ctx->stack_offset <= 0) {
+                       LOG_ERROR("Error: Pracc stack out of bounds");
+                       return ERROR_JTAG_DEVICE_ERROR;
+               }
                /* save to our debug stack */
                data = ctx->stack[--ctx->stack_offset];
        } else {
@@ -209,14 +213,18 @@ static int mips32_pracc_exec_write(struct mips32_pracc_context *ctx, uint32_t ad
                return retval;
 
        if ((address >= MIPS32_PRACC_PARAM_IN)
-               && (address <= MIPS32_PRACC_PARAM_IN + ctx->num_iparam * 4)) {
+               && (address < MIPS32_PRACC_PARAM_IN + ctx->num_iparam * 4)) {
                offset = (address - MIPS32_PRACC_PARAM_IN) / 4;
                ctx->local_iparam[offset] = data;
        } else if ((address >= MIPS32_PRACC_PARAM_OUT)
-               && (address <= MIPS32_PRACC_PARAM_OUT + ctx->num_oparam * 4)) {
+               && (address < MIPS32_PRACC_PARAM_OUT + ctx->num_oparam * 4)) {
                offset = (address - MIPS32_PRACC_PARAM_OUT) / 4;
                ctx->local_oparam[offset] = data;
        } else if (address == MIPS32_PRACC_STACK) {
+               if (ctx->stack_offset >= 32) {
+                       LOG_ERROR("Error: Pracc stack out of bounds");
+                       return ERROR_JTAG_DEVICE_ERROR;
+               }
                /* save data onto our stack */
                ctx->stack[ctx->stack_offset++] = data;
        } else {
@@ -231,7 +239,7 @@ int mips32_pracc_exec(struct mips_ejtag *ejtag_info, int code_len, const uint32_
                int num_param_in, uint32_t *param_in, int num_param_out, uint32_t *param_out, int cycle)
 {
        uint32_t ejtag_ctrl;
-       uint32_t address, data;
+       uint32_t address;
        struct mips32_pracc_context ctx;
        int retval;
        int pass = 0;
@@ -250,7 +258,7 @@ int mips32_pracc_exec(struct mips_ejtag *ejtag_info, int code_len, const uint32_
                if (retval != ERROR_OK)
                        return retval;
 
-               address = data = 0;
+               address = 0;
                mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS);
                retval = mips_ejtag_drscan_32(ejtag_info, &address);
                if (retval != ERROR_OK)