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// SPDX-License-Identifier: GPL-2.0-or-later
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "target/target.h"
#include "target/register.h"
#include "riscv.h"
#include "program.h"
#include "helper/log.h"
#include "asm.h"
#include "debug_defines.h"
#include "encoding.h"
/* Program interface. */
int riscv_program_init(struct riscv_program *p, struct target *target)
{
memset(p, 0, sizeof(*p));
p->target = target;
p->instruction_count = 0;
p->target_xlen = riscv_xlen(target);
for (size_t i = 0; i < RISCV_REGISTER_COUNT; ++i)
p->writes_xreg[i] = 0;
for (size_t i = 0; i < RISCV_MAX_PROGBUF_SIZE; ++i)
p->progbuf[i] = -1;
p->execution_result = RISCV_PROGBUF_EXEC_RESULT_NOT_EXECUTED;
return ERROR_OK;
}
int riscv_program_write(struct riscv_program *program)
{
for (unsigned i = 0; i < program->instruction_count; ++i) {
LOG_TARGET_DEBUG(program->target, "progbuf[%02x] = DASM(0x%08x)",
i, program->progbuf[i]);
if (riscv_write_progbuf(program->target, i, program->progbuf[i]) != ERROR_OK)
return ERROR_FAIL;
}
return ERROR_OK;
}
/** Add ebreak and execute the program. */
int riscv_program_exec(struct riscv_program *p, struct target *t)
{
keep_alive();
p->execution_result = RISCV_PROGBUF_EXEC_RESULT_UNKNOWN;
riscv_reg_t saved_registers[GDB_REGNO_XPR31 + 1];
for (size_t i = GDB_REGNO_ZERO + 1; i <= GDB_REGNO_XPR31; ++i) {
if (p->writes_xreg[i]) {
LOG_TARGET_DEBUG(t, "Saving register %d as used by program", (int)i);
int result = riscv_get_register(t, &saved_registers[i], i);
if (result != ERROR_OK)
return result;
}
}
if (riscv_program_ebreak(p) != ERROR_OK) {
LOG_TARGET_ERROR(t, "Unable to insert ebreak into program buffer");
for (size_t i = 0; i < riscv_progbuf_size(p->target); ++i)
LOG_TARGET_ERROR(t, "ram[%02x]: DASM(0x%08" PRIx32 ") [0x%08" PRIx32 "]",
(int)i, p->progbuf[i], p->progbuf[i]);
return ERROR_FAIL;
}
if (riscv_program_write(p) != ERROR_OK)
return ERROR_FAIL;
uint32_t cmderr;
if (riscv_execute_progbuf(t, &cmderr) != ERROR_OK) {
p->execution_result = (cmderr == DM_ABSTRACTCS_CMDERR_EXCEPTION)
? RISCV_PROGBUF_EXEC_RESULT_EXCEPTION
: RISCV_PROGBUF_EXEC_RESULT_UNKNOWN_ERROR;
/* TODO: what happens if we fail here, but need to restore registers? */
LOG_TARGET_DEBUG(t, "Unable to execute program %p", p);
return ERROR_FAIL;
}
p->execution_result = RISCV_PROGBUF_EXEC_RESULT_SUCCESS;
for (size_t i = GDB_REGNO_ZERO; i <= GDB_REGNO_XPR31; ++i)
if (p->writes_xreg[i])
riscv_set_register(t, i, saved_registers[i]);
return ERROR_OK;
}
int riscv_program_sdr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno b, int offset)
{
return riscv_program_insert(p, sd(d, b, offset));
}
int riscv_program_swr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno b, int offset)
{
return riscv_program_insert(p, sw(d, b, offset));
}
int riscv_program_shr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno b, int offset)
{
return riscv_program_insert(p, sh(d, b, offset));
}
int riscv_program_sbr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno b, int offset)
{
return riscv_program_insert(p, sb(d, b, offset));
}
int riscv_program_store(struct riscv_program *p, enum gdb_regno d, enum gdb_regno b, int offset,
unsigned int size)
{
switch (size) {
case 1:
return riscv_program_sbr(p, d, b, offset);
case 2:
return riscv_program_shr(p, d, b, offset);
case 4:
return riscv_program_swr(p, d, b, offset);
case 8:
return riscv_program_sdr(p, d, b, offset);
}
assert(false && "Unsupported size");
return ERROR_FAIL;
}
int riscv_program_ldr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno b, int offset)
{
return riscv_program_insert(p, ld(d, b, offset));
}
int riscv_program_lwr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno b, int offset)
{
return riscv_program_insert(p, lw(d, b, offset));
}
int riscv_program_lhr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno b, int offset)
{
return riscv_program_insert(p, lh(d, b, offset));
}
int riscv_program_lbr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno b, int offset)
{
return riscv_program_insert(p, lb(d, b, offset));
}
int riscv_program_load(struct riscv_program *p, enum gdb_regno d, enum gdb_regno b, int offset,
unsigned int size)
{
switch (size) {
case 1:
return riscv_program_lbr(p, d, b, offset);
case 2:
return riscv_program_lhr(p, d, b, offset);
case 4:
return riscv_program_lwr(p, d, b, offset);
case 8:
return riscv_program_ldr(p, d, b, offset);
}
assert(false && "Unsupported size");
return ERROR_FAIL;
}
int riscv_program_csrrsi(struct riscv_program *p, enum gdb_regno d, unsigned int z, enum gdb_regno csr)
{
assert(csr >= GDB_REGNO_CSR0 && csr <= GDB_REGNO_CSR4095);
return riscv_program_insert(p, csrrsi(d, z, csr - GDB_REGNO_CSR0));
}
int riscv_program_csrrci(struct riscv_program *p, enum gdb_regno d, unsigned int z, enum gdb_regno csr)
{
assert(csr >= GDB_REGNO_CSR0 && csr <= GDB_REGNO_CSR4095);
return riscv_program_insert(p, csrrci(d, z, csr - GDB_REGNO_CSR0));
}
int riscv_program_csrr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno csr)
{
assert(csr >= GDB_REGNO_CSR0 && csr <= GDB_REGNO_CSR4095);
return riscv_program_insert(p, csrrs(d, GDB_REGNO_ZERO, csr - GDB_REGNO_CSR0));
}
int riscv_program_csrw(struct riscv_program *p, enum gdb_regno s, enum gdb_regno csr)
{
assert(csr >= GDB_REGNO_CSR0);
return riscv_program_insert(p, csrrw(GDB_REGNO_ZERO, s, csr - GDB_REGNO_CSR0));
}
int riscv_program_fence_i(struct riscv_program *p)
{
return riscv_program_insert(p, fence_i());
}
int riscv_program_fence_rw_rw(struct riscv_program *p)
{
return riscv_program_insert(p, fence_rw_rw());
}
int riscv_program_ebreak(struct riscv_program *p)
{
struct target *target = p->target;
RISCV_INFO(r);
if (p->instruction_count == riscv_progbuf_size(p->target) &&
r->impebreak) {
return ERROR_OK;
}
return riscv_program_insert(p, ebreak());
}
int riscv_program_addi(struct riscv_program *p, enum gdb_regno d, enum gdb_regno s, int16_t u)
{
return riscv_program_insert(p, addi(d, s, u));
}
int riscv_program_insert(struct riscv_program *p, riscv_insn_t i)
{
if (p->instruction_count >= riscv_progbuf_size(p->target)) {
LOG_TARGET_ERROR(p->target, "Unable to insert program into progbuf, "
"capacity would be exceeded (progbufsize=%d).",
(int)riscv_progbuf_size(p->target));
return ERROR_FAIL;
}
p->progbuf[p->instruction_count] = i;
p->instruction_count++;
return ERROR_OK;
}
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