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Register read/write might be working. 

Change-Id: I6c51d6157dde56d8cd666b4d30ec7bbc7a4bef9f
This commit is contained in:
Tim Newsome 2017-10-12 14:38:52 -07:00
parent 94e8250713
commit e7bb815e87
2 changed files with 67 additions and 72 deletions
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3
src/target/riscv/program.c
View File

@ -40,6 +40,7 @@ int riscv_program_init(struct riscv_program *p, struct target *target)
return ERROR_OK; return ERROR_OK;
} }
/** Add ebreak and execute the program. */
int riscv_program_exec(struct riscv_program *p, struct target *t) int riscv_program_exec(struct riscv_program *p, struct target *t)
{ {
keep_alive(); keep_alive();
@ -258,7 +259,7 @@ int riscv_program_sb(struct riscv_program *p, enum gdb_regno d, riscv_addr_t add
int riscv_program_csrr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno csr) int riscv_program_csrr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno csr)
{ {
assert(csr >= GDB_REGNO_CSR0); assert(csr >= GDB_REGNO_CSR0 && csr <= GDB_REGNO_CSR4095);
return riscv_program_insert(p, csrrs(d, GDB_REGNO_X0, csr - GDB_REGNO_CSR0)); return riscv_program_insert(p, csrrs(d, GDB_REGNO_X0, csr - GDB_REGNO_CSR0));
} }

78
src/target/riscv/riscv-013.c
View File

@ -37,7 +37,7 @@ static void riscv013_step_or_resume_current_hart(struct target *target, bool ste
//static void riscv013_set_autoexec(struct target *target, unsigned index, //static void riscv013_set_autoexec(struct target *target, unsigned index,
//bool enabled); //bool enabled);
//static int riscv013_debug_buffer_register(struct target *target, riscv_addr_t addr); //static int riscv013_debug_buffer_register(struct target *target, riscv_addr_t addr);
//static void riscv013_clear_abstract_error(struct target *target); static void riscv013_clear_abstract_error(struct target *target);
/* Implementations of the functions in riscv_info_t. */ /* Implementations of the functions in riscv_info_t. */
static riscv_reg_t riscv013_get_register(struct target *target, int hartid, int regid); static riscv_reg_t riscv013_get_register(struct target *target, int hartid, int regid);
@ -62,6 +62,7 @@ static void riscv013_fill_dmi_write_u64(struct target *target, char *buf, int a,
static void riscv013_fill_dmi_read_u64(struct target *target, char *buf, int a); static void riscv013_fill_dmi_read_u64(struct target *target, char *buf, int a);
static int riscv013_dmi_write_u64_bits(struct target *target); static int riscv013_dmi_write_u64_bits(struct target *target);
static void riscv013_fill_dmi_nop_u64(struct target *target, char *buf); static void riscv013_fill_dmi_nop_u64(struct target *target, char *buf);
static int register_read_direct(struct target *target, uint64_t *value, uint32_t number);
/** /**
* Since almost everything can be accomplish by scanning the dbus register, all * Since almost everything can be accomplish by scanning the dbus register, all
@ -771,21 +772,21 @@ static int register_write_direct(struct target *target, unsigned number,
riscv_program_init(&program, target); riscv_program_init(&program, target);
assert(0); uint64_t s0;
#if 0 if (register_read_direct(target, &s0, GDB_REGNO_S0) != ERROR_OK)
riscv_addr_t input = riscv_program_alloc_d(&program); return ERROR_FAIL;
riscv_program_write_ram(&program, input + 4, value >> 32);
riscv_program_write_ram(&program, input, value);
assert(GDB_REGNO_XPR0 == 0); if (register_write_direct(target, GDB_REGNO_S0, value) != ERROR_OK)
if (number <= GDB_REGNO_XPR31) { return ERROR_FAIL;
riscv_program_lx(&program, number, input);
} else if (number >= GDB_REGNO_FPR0 && number <= GDB_REGNO_FPR31) { if (number >= GDB_REGNO_FPR0 && number <= GDB_REGNO_FPR31) {
riscv_program_flx(&program, number, input); if (supports_extension(target, 'D') && riscv_xlen(target) >= 64) {
riscv_program_insert(&program, fmv_x_d(S0, number - GDB_REGNO_FPR0));
} else {
riscv_program_insert(&program, fmv_x_s(S0, number - GDB_REGNO_FPR0));
}
} else if (number >= GDB_REGNO_CSR0 && number <= GDB_REGNO_CSR4095) { } else if (number >= GDB_REGNO_CSR0 && number <= GDB_REGNO_CSR4095) {
enum gdb_regno temp = riscv_program_gettemp(&program); riscv_program_csrw(&program, S0, number);
riscv_program_lx(&program, temp, input);
riscv_program_csrw(&program, temp, number);
} else { } else {
LOG_ERROR("Unsupported register (enum gdb_regno)(%d)", number); LOG_ERROR("Unsupported register (enum gdb_regno)(%d)", number);
abort(); abort();
@ -797,8 +798,11 @@ static int register_write_direct(struct target *target, unsigned number,
return ERROR_FAIL; return ERROR_FAIL;
} }
// Restore S0.
if (register_write_direct(target, GDB_REGNO_S0, s0) != ERROR_OK)
return ERROR_FAIL;
return ERROR_OK; return ERROR_OK;
#endif
} }
/** Actually read registers from the target right now. */ /** Actually read registers from the target right now. */
@ -810,7 +814,6 @@ static int register_read_direct(struct target *target, uint64_t *value, uint32_t
if (result != ERROR_OK) { if (result != ERROR_OK) {
struct riscv_program program; struct riscv_program program;
riscv_program_init(&program, target); riscv_program_init(&program, target);
assert(0);
assert(number != GDB_REGNO_S0); assert(number != GDB_REGNO_S0);
uint64_t s0; uint64_t s0;
@ -818,43 +821,34 @@ static int register_read_direct(struct target *target, uint64_t *value, uint32_t
return ERROR_FAIL; return ERROR_FAIL;
// Write program to move data into s0. // Write program to move data into s0.
// Execute program. if (number >= GDB_REGNO_FPR0 && number <= GDB_REGNO_FPR31) {
// Read S0 // TODO: Possibly set F in mstatus.
if (register_read_direct(target, value, GDB_REGNO_S0) != ERROR_OK) // TODO: Fully support D extension on RV32.
return ERROR_FAIL; if (supports_extension(target, 'D') && riscv_xlen(target) >= 64) {
// Restore S0. riscv_program_insert(&program, fmv_d_x(number - GDB_REGNO_FPR0, S0));
if (register_write_direct(target, GDB_REGNO_S0, &s0) != ERROR_OK) } else {
return ERROR_FAIL; riscv_program_insert(&program, fmv_s_x(number - GDB_REGNO_FPR0, S0));
#if 0 }
riscv_addr_t output = riscv_program_alloc_d(&program);
riscv_program_write_ram(&program, output + 4, 0);
riscv_program_write_ram(&program, output, 0);
assert(GDB_REGNO_XPR0 == 0);
if (number <= GDB_REGNO_XPR31) {
riscv_program_sx(&program, number, output);
} else if (number >= GDB_REGNO_FPR0 && number <= GDB_REGNO_FPR31) {
riscv_program_fsx(&program, number, output);
} else if (number >= GDB_REGNO_CSR0 && number <= GDB_REGNO_CSR4095) { } else if (number >= GDB_REGNO_CSR0 && number <= GDB_REGNO_CSR4095) {
LOG_DEBUG("reading CSR index=0x%03x", number - GDB_REGNO_CSR0); riscv_program_csrr(&program, S0, number);
enum gdb_regno temp = riscv_program_gettemp(&program);
riscv_program_csrr(&program, temp, number);
riscv_program_sx(&program, temp, output);
} else { } else {
LOG_ERROR("Unsupported register (enum gdb_regno)(%d)", number); LOG_ERROR("Unsupported register (enum gdb_regno)(%d)", number);
abort(); abort();
} }
// Execute program.
int exec_out = riscv_program_exec(&program, target); int exec_out = riscv_program_exec(&program, target);
if (exec_out != ERROR_OK) { if (exec_out != ERROR_OK) {
riscv013_clear_abstract_error(target); riscv013_clear_abstract_error(target);
return ERROR_FAIL; return ERROR_FAIL;
} }
*value = 0; // Read S0
*value |= ((uint64_t)(riscv_program_read_ram(&program, output + 4))) << 32; if (register_read_direct(target, value, GDB_REGNO_S0) != ERROR_OK)
*value |= riscv_program_read_ram(&program, output); return ERROR_FAIL;
#endif // Restore S0.
if (register_write_direct(target, GDB_REGNO_S0, s0) != ERROR_OK)
return ERROR_FAIL;
} }
LOG_DEBUG("[%d] reg[0x%x] = 0x%" PRIx64, riscv_current_hartid(target), LOG_DEBUG("[%d] reg[0x%x] = 0x%" PRIx64, riscv_current_hartid(target),
@ -2028,6 +2022,7 @@ int riscv013_debug_buffer_register(struct target *target, riscv_addr_t addr)
else else
return DMI_PROGBUF0 + (addr - riscv013_progbuf_addr(target)) / 4; return DMI_PROGBUF0 + (addr - riscv013_progbuf_addr(target)) / 4;
} }
#endif
void riscv013_clear_abstract_error(struct target *target) void riscv013_clear_abstract_error(struct target *target)
{ {
@ -2049,4 +2044,3 @@ void riscv013_clear_abstract_error(struct target *target)
// Clear the error status. // Clear the error status.
dmi_write(target, DMI_ABSTRACTCS, abstractcs & DMI_ABSTRACTCS_CMDERR); dmi_write(target, DMI_ABSTRACTCS, abstractcs & DMI_ABSTRACTCS_CMDERR);
} }
#endif