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target/riscv/riscv.c: support auto-selection of software breakpoint size #1273

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target/riscv/riscv.c: support auto-selection of software breakpoint size #1273

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10 changes: 10 additions & 0 deletions src/target/riscv/riscv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1609,6 +1609,16 @@ static int riscv_add_breakpoint(struct target *target, struct breakpoint *breakp
LOG_TARGET_DEBUG(target, "@0x%" TARGET_PRIxADDR, breakpoint->address);
assert(breakpoint);
if (breakpoint->type == BKPT_SOFT) {
if (breakpoint->length == 0) {
breakpoint->length = riscv_supports_extension(target, 'c') ? 2 : 4;
uint8_t *instr_buffer = (uint8_t *)realloc (breakpoint->orig_instr, breakpoint->length);
if (!instr_buffer) {
LOG_ERROR("Fail to realloc memory with original instruction");
return ERROR_FAIL;
}
breakpoint->orig_instr = instr_buffer;
}

/** @todo check RVC for size/alignment */
if (!(breakpoint->length == 4 || breakpoint->length == 2)) {
LOG_TARGET_ERROR(target, "Invalid breakpoint length %d", breakpoint->length);
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