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Add RISC-V support. 

This supports both 0.11 and 0.13 versions of the debug spec.

Support for `-rtos riscv` will come in a separate commit since it was
easy to separate out, and is likely to be more controversial.

Flash support for the SiFive boards will also come in a later commit.

Change-Id: I1d38fe669c2041b4e21a5c54a091594aac3e2190
Signed-off-by: Tim Newsome <tim@sifive.com>
Reviewed-on: http://openocd.zylin.com/4578
Tested-by: jenkins
Reviewed-by: Liviu Ionescu <ilg@livius.net>
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>
bscan_tunnel
Tim Newsome 2018-07-18 13:34:23 -07:00 committed by Matthias Welwarsky
parent 9363705820
commit a51ab8ddf6
22 changed files with 12313 additions and 1 deletions
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78
doc/openocd.texi
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@ -8946,6 +8946,84 @@ Display all registers in @emph{group}.
"timer" or any new group created with addreg command. "timer" or any new group created with addreg command.
@end deffn @end deffn
@section RISC-V Architecture
@uref{http://riscv.org/, RISC-V} is a free and open ISA. OpenOCD supports JTAG
debug of targets that implement version 0.11 and 0.13 of the RISC-V Debug
Specification.
@subsection RISC-V Terminology
A @emph{hart} is a hardware thread. A hart may share resources (eg. FPU) with
another hart, or may be a separate core. RISC-V treats those the same, and
OpenOCD exposes each hart as a separate core.
@subsection RISC-V Debug Configuration Commands
@deffn Command {riscv expose_csrs} n0[-m0][,n1[-m1]]...
Configure a list of inclusive ranges for CSRs to expose in addition to the
standard ones. This must be executed before `init`.
By default OpenOCD attempts to expose only CSRs that are mentioned in a spec,
and then only if the corresponding extension appears to be implemented. This
command can be used if OpenOCD gets this wrong, or a target implements custom
CSRs.
@end deffn
@deffn Command {riscv set_command_timeout_sec} [seconds]
Set the wall-clock timeout (in seconds) for individual commands. The default
should work fine for all but the slowest targets (eg. simulators).
@end deffn
@deffn Command {riscv set_reset_timeout_sec} [seconds]
Set the maximum time to wait for a hart to come out of reset after reset is
deasserted.
@end deffn
@deffn Command {riscv set_scratch_ram} none|[address]
Set the address of 16 bytes of scratch RAM the debugger can use, or 'none'.
This is used to access 64-bit floating point registers on 32-bit targets.
@end deffn
@deffn Command {riscv set_prefer_sba} on|off
When on, prefer to use System Bus Access to access memory. When off, prefer to
use the Program Buffer to access memory.
@end deffn
@subsection RISC-V Authentication Commands
The following commands can be used to authenticate to a RISC-V system. Eg. a
trivial challenge-response protocol could be implemented as follows in a
configuration file, immediately following @command{init}:
@example
set challenge [ocd_riscv authdata_read]
riscv authdata_write [expr $challenge + 1]
@end example
@deffn Command {riscv authdata_read}
Return the 32-bit value read from authdata. Note that to get read value back in
a TCL script, it needs to be invoked as @command{ocd_riscv authdata_read}.
@end deffn
@deffn Command {riscv authdata_write} value
Write the 32-bit value to authdata.
@end deffn
@subsection RISC-V DMI Commands
The following commands allow direct access to the Debug Module Interface, which
can be used to interact with custom debug features.
@deffn Command {riscv dmi_read}
Perform a 32-bit DMI read at address, returning the value. Note that to get
read value back in a TCL script, it needs to be invoked as @command{ocd_riscv
dmi_read}.
@end deffn
@deffn Command {riscv dmi_write} address value
Perform a 32-bit DMI write of value at address.
@end deffn
@anchor{softwaredebugmessagesandtracing} @anchor{softwaredebugmessagesandtracing}
@section Software Debug Messages and Tracing @section Software Debug Messages and Tracing
@cindex Linux-ARM DCC support @cindex Linux-ARM DCC support

2
src/helper/log.h
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@ -149,6 +149,8 @@ extern int debug_level;
*/ */
#define ERROR_FAIL (-4) #define ERROR_FAIL (-4)
#define ERROR_WAIT (-5) #define ERROR_WAIT (-5)
/* ERROR_TIMEOUT is already taken by winerror.h. */
#define ERROR_TIMEOUT_REACHED (-6)
#endif /* OPENOCD_HELPER_LOG_H */ #endif /* OPENOCD_HELPER_LOG_H */

5
src/target/Makefile.am
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@ -4,7 +4,9 @@ else
OOCD_TRACE_FILES = OOCD_TRACE_FILES =
endif endif
%C%_libtarget_la_LIBADD = %D%/openrisc/libopenrisc.la %C%_libtarget_la_LIBADD = %D%/openrisc/libopenrisc.la \
%D%/riscv/libriscv.la
STARTUP_TCL_SRCS += %D%/startup.tcl STARTUP_TCL_SRCS += %D%/startup.tcl
@ -218,3 +220,4 @@ INTEL_IA32_SRC = \
%D%/arm_cti.h %D%/arm_cti.h
include %D%/openrisc/Makefile.am include %D%/openrisc/Makefile.am
include %D%/riscv/Makefile.am

16
src/target/riscv/Makefile.am Normal file
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@ -0,0 +1,16 @@
noinst_LTLIBRARIES += %D%/libriscv.la
%C%_libriscv_la_SOURCES = \
%D%/asm.h \
%D%/batch.h \
%D%/debug_defines.h \
%D%/encoding.h \
%D%/gdb_regs.h \
%D%/opcodes.h \
%D%/program.h \
%D%/riscv.h \
%D%/batch.c \
%D%/program.c \
%D%/riscv-011.c \
%D%/riscv-013.c \
%D%/riscv.c \
%D%/riscv_semihosting.c

38
src/target/riscv/asm.h Normal file
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@ -0,0 +1,38 @@
#ifndef TARGET__RISCV__ASM_H
#define TARGET__RISCV__ASM_H
#include "riscv.h"
/*** Version-independent functions that we don't want in the main address space. ***/
static uint32_t load(const struct target *target, unsigned int rd,
unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t load(const struct target *target, unsigned int rd,
unsigned int base, uint16_t offset)
{
switch (riscv_xlen(target)) {
case 32:
return lw(rd, base, offset);
case 64:
return ld(rd, base, offset);
}
assert(0);
return 0; /* Silence -Werror=return-type */
}
static uint32_t store(const struct target *target, unsigned int src,
unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t store(const struct target *target, unsigned int src,
unsigned int base, uint16_t offset)
{
switch (riscv_xlen(target)) {
case 32:
return sw(src, base, offset);
case 64:
return sd(src, base, offset);
}
assert(0);
return 0; /* Silence -Werror=return-type */
}
#endif

172
src/target/riscv/batch.c Normal file
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@ -0,0 +1,172 @@
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "batch.h"
#include "debug_defines.h"
#include "riscv.h"
#define get_field(reg, mask) (((reg) & (mask)) / ((mask) & ~((mask) << 1)))
#define set_field(reg, mask, val) (((reg) & ~(mask)) | (((val) * ((mask) & ~((mask) << 1))) & (mask)))
static void dump_field(const struct scan_field *field);
struct riscv_batch *riscv_batch_alloc(struct target *target, size_t scans, size_t idle)
{
scans += 4;
struct riscv_batch *out = malloc(sizeof(*out));
memset(out, 0, sizeof(*out));
out->target = target;
out->allocated_scans = scans;
out->used_scans = 0;
out->idle_count = idle;
out->data_out = malloc(sizeof(*out->data_out) * (scans) * sizeof(uint64_t));
out->data_in = malloc(sizeof(*out->data_in) * (scans) * sizeof(uint64_t));
out->fields = malloc(sizeof(*out->fields) * (scans));
out->last_scan = RISCV_SCAN_TYPE_INVALID;
out->read_keys = malloc(sizeof(*out->read_keys) * (scans));
out->read_keys_used = 0;
return out;
}
void riscv_batch_free(struct riscv_batch *batch)
{
free(batch->data_in);
free(batch->data_out);
free(batch->fields);
free(batch);
}
bool riscv_batch_full(struct riscv_batch *batch)
{
return batch->used_scans > (batch->allocated_scans - 4);
}
int riscv_batch_run(struct riscv_batch *batch)
{
if (batch->used_scans == 0) {
LOG_DEBUG("Ignoring empty batch.");
return ERROR_OK;
}
keep_alive();
LOG_DEBUG("running a batch of %ld scans", (long)batch->used_scans);
riscv_batch_add_nop(batch);
for (size_t i = 0; i < batch->used_scans; ++i) {
jtag_add_dr_scan(batch->target->tap, 1, batch->fields + i, TAP_IDLE);
if (batch->idle_count > 0)
jtag_add_runtest(batch->idle_count, TAP_IDLE);
}
LOG_DEBUG("executing queue");
if (jtag_execute_queue() != ERROR_OK) {
LOG_ERROR("Unable to execute JTAG queue");
return ERROR_FAIL;
}
for (size_t i = 0; i < batch->used_scans; ++i)
dump_field(batch->fields + i);
return ERROR_OK;
}
void riscv_batch_add_dmi_write(struct riscv_batch *batch, unsigned address, uint64_t data)
{
assert(batch->used_scans < batch->allocated_scans);
struct scan_field *field = batch->fields + batch->used_scans;
field->num_bits = riscv_dmi_write_u64_bits(batch->target);
field->out_value = (void *)(batch->data_out + batch->used_scans * sizeof(uint64_t));
field->in_value = (void *)(batch->data_in + batch->used_scans * sizeof(uint64_t));
riscv_fill_dmi_write_u64(batch->target, (char *)field->out_value, address, data);
riscv_fill_dmi_nop_u64(batch->target, (char *)field->in_value);
batch->last_scan = RISCV_SCAN_TYPE_WRITE;
batch->used_scans++;
}
size_t riscv_batch_add_dmi_read(struct riscv_batch *batch, unsigned address)
{
assert(batch->used_scans < batch->allocated_scans);
struct scan_field *field = batch->fields + batch->used_scans;
field->num_bits = riscv_dmi_write_u64_bits(batch->target);
field->out_value = (void *)(batch->data_out + batch->used_scans * sizeof(uint64_t));
field->in_value = (void *)(batch->data_in + batch->used_scans * sizeof(uint64_t));
riscv_fill_dmi_read_u64(batch->target, (char *)field->out_value, address);
riscv_fill_dmi_nop_u64(batch->target, (char *)field->in_value);
batch->last_scan = RISCV_SCAN_TYPE_READ;
batch->used_scans++;
/* FIXME We get the read response back on the next scan. For now I'm
* just sticking a NOP in there, but this should be coelesced away. */
riscv_batch_add_nop(batch);
batch->read_keys[batch->read_keys_used] = batch->used_scans - 1;
LOG_DEBUG("read key %u for batch 0x%p is %u (0x%p)",
(unsigned) batch->read_keys_used, batch, (unsigned) (batch->used_scans - 1),
batch->data_in + sizeof(uint64_t) * (batch->used_scans + 1));
return batch->read_keys_used++;
}
uint64_t riscv_batch_get_dmi_read(struct riscv_batch *batch, size_t key)
{
assert(key < batch->read_keys_used);
size_t index = batch->read_keys[key];
assert(index <= batch->used_scans);
uint8_t *base = batch->data_in + 8 * index;
return base[0] |
((uint64_t) base[1]) << 8 |
((uint64_t) base[2]) << 16 |
((uint64_t) base[3]) << 24 |
((uint64_t) base[4]) << 32 |
((uint64_t) base[5]) << 40 |
((uint64_t) base[6]) << 48 |
((uint64_t) base[7]) << 56;
}
void riscv_batch_add_nop(struct riscv_batch *batch)
{
assert(batch->used_scans < batch->allocated_scans);
struct scan_field *field = batch->fields + batch->used_scans;
field->num_bits = riscv_dmi_write_u64_bits(batch->target);
field->out_value = (void *)(batch->data_out + batch->used_scans * sizeof(uint64_t));
field->in_value = (void *)(batch->data_in + batch->used_scans * sizeof(uint64_t));
riscv_fill_dmi_nop_u64(batch->target, (char *)field->out_value);
riscv_fill_dmi_nop_u64(batch->target, (char *)field->in_value);
batch->last_scan = RISCV_SCAN_TYPE_NOP;
batch->used_scans++;
LOG_DEBUG(" added NOP with in_value=0x%p", field->in_value);
}
void dump_field(const struct scan_field *field)
{
static const char * const op_string[] = {"-", "r", "w", "?"};
static const char * const status_string[] = {"+", "?", "F", "b"};
if (debug_level < LOG_LVL_DEBUG)
return;
assert(field->out_value != NULL);
uint64_t out = buf_get_u64(field->out_value, 0, field->num_bits);
unsigned int out_op = get_field(out, DTM_DMI_OP);
unsigned int out_data = get_field(out, DTM_DMI_DATA);
unsigned int out_address = out >> DTM_DMI_ADDRESS_OFFSET;
if (field->in_value) {
uint64_t in = buf_get_u64(field->in_value, 0, field->num_bits);
unsigned int in_op = get_field(in, DTM_DMI_OP);
unsigned int in_data = get_field(in, DTM_DMI_DATA);
unsigned int in_address = in >> DTM_DMI_ADDRESS_OFFSET;
log_printf_lf(LOG_LVL_DEBUG,
__FILE__, __LINE__, __PRETTY_FUNCTION__,
"%db %s %08x @%02x -> %s %08x @%02x",
field->num_bits,
op_string[out_op], out_data, out_address,
status_string[in_op], in_data, in_address);
} else {
log_printf_lf(LOG_LVL_DEBUG,
__FILE__, __LINE__, __PRETTY_FUNCTION__, "%db %s %08x @%02x -> ?",
field->num_bits, op_string[out_op], out_data, out_address);
}
}

64
src/target/riscv/batch.h Normal file
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@ -0,0 +1,64 @@
#ifndef TARGET__RISCV__SCANS_H
#define TARGET__RISCV__SCANS_H
#include "target/target.h"
#include "jtag/jtag.h"
enum riscv_scan_type {
RISCV_SCAN_TYPE_INVALID,
RISCV_SCAN_TYPE_NOP,
RISCV_SCAN_TYPE_READ,
RISCV_SCAN_TYPE_WRITE,
};
/* A batch of multiple JTAG scans, which are grouped together to avoid the
* overhead of some JTAG adapters when sending single commands. This is
* designed to support block copies, as that's what we actually need to go
* fast. */
struct riscv_batch {
struct target *target;
size_t allocated_scans;
size_t used_scans;
size_t idle_count;
uint8_t *data_out;
uint8_t *data_in;
struct scan_field *fields;
/* In JTAG we scan out the previous value's output when performing a
* scan. This is a pain for users, so we just provide them the
* illusion of not having to do this by eliding all but the last NOP.
* */
enum riscv_scan_type last_scan;
/* The read keys. */
size_t *read_keys;
size_t read_keys_used;
};
/* Allocates (or frees) a new scan set. "scans" is the maximum number of JTAG
* scans that can be issued to this object, and idle is the number of JTAG idle
* cycles between every real scan. */
struct riscv_batch *riscv_batch_alloc(struct target *target, size_t scans, size_t idle);
void riscv_batch_free(struct riscv_batch *batch);
/* Checks to see if this batch is full. */
bool riscv_batch_full(struct riscv_batch *batch);
/* Executes this scan batch. */
int riscv_batch_run(struct riscv_batch *batch);
/* Adds a DMI write to this batch. */
void riscv_batch_add_dmi_write(struct riscv_batch *batch, unsigned address, uint64_t data);
/* DMI reads must be handled in two parts: the first one schedules a read and
* provides a key, the second one actually obtains the value of that read .*/
size_t riscv_batch_add_dmi_read(struct riscv_batch *batch, unsigned address);
uint64_t riscv_batch_get_dmi_read(struct riscv_batch *batch, size_t key);
/* Scans in a NOP. */
void riscv_batch_add_nop(struct riscv_batch *batch);
#endif

1414
src/target/riscv/debug_defines.h Normal file
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1473
src/target/riscv/encoding.h Normal file
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File diff suppressed because it is too large Load Diff

93
src/target/riscv/gdb_regs.h Normal file
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@ -0,0 +1,93 @@
#ifndef TARGET__RISCV__GDB_REGS_H
#define TARGET__RISCV__GDB_REGS_H
/* gdb's register list is defined in riscv_gdb_reg_names gdb/riscv-tdep.c in
* its source tree. We must interpret the numbers the same here. */
enum gdb_regno {
GDB_REGNO_ZERO = 0, /* Read-only register, always 0. */
GDB_REGNO_RA = 1, /* Return Address. */
GDB_REGNO_SP = 2, /* Stack Pointer. */
GDB_REGNO_GP = 3, /* Global Pointer. */
GDB_REGNO_TP = 4, /* Thread Pointer. */
GDB_REGNO_T0,
GDB_REGNO_T1,
GDB_REGNO_T2,
GDB_REGNO_S0 = 8,
GDB_REGNO_FP = 8, /* Frame Pointer. */
GDB_REGNO_S1,
GDB_REGNO_A0 = 10, /* First argument. */
GDB_REGNO_A1 = 11, /* Second argument. */
GDB_REGNO_A2,
GDB_REGNO_A3,
GDB_REGNO_A4,
GDB_REGNO_A5,
GDB_REGNO_A6,
GDB_REGNO_A7,
GDB_REGNO_S2,
GDB_REGNO_S3,
GDB_REGNO_S4,
GDB_REGNO_S5,
GDB_REGNO_S6,
GDB_REGNO_S7,
GDB_REGNO_S8,
GDB_REGNO_S9,
GDB_REGNO_S10,
GDB_REGNO_S11,
GDB_REGNO_T3,
GDB_REGNO_T4,
GDB_REGNO_T5,
GDB_REGNO_T6,
GDB_REGNO_XPR31 = GDB_REGNO_T6,
GDB_REGNO_PC = 32,
GDB_REGNO_FPR0 = 33,
GDB_REGNO_FT0 = GDB_REGNO_FPR0,
GDB_REGNO_FT1,
GDB_REGNO_FT2,
GDB_REGNO_FT3,
GDB_REGNO_FT4,
GDB_REGNO_FT5,
GDB_REGNO_FT6,
GDB_REGNO_FT7,
GDB_REGNO_FS0,
GDB_REGNO_FS1,
GDB_REGNO_FA0,
GDB_REGNO_FA1,
GDB_REGNO_FA2,
GDB_REGNO_FA3,
GDB_REGNO_FA4,
GDB_REGNO_FA5,
GDB_REGNO_FA6,
GDB_REGNO_FA7,
GDB_REGNO_FS2,
GDB_REGNO_FS3,
GDB_REGNO_FS4,
GDB_REGNO_FS5,
GDB_REGNO_FS6,
GDB_REGNO_FS7,
GDB_REGNO_FS8,
GDB_REGNO_FS9,
GDB_REGNO_FS10,
GDB_REGNO_FS11,
GDB_REGNO_FT8,
GDB_REGNO_FT9,
GDB_REGNO_FT10,
GDB_REGNO_FT11,
GDB_REGNO_FPR31 = GDB_REGNO_FT11,
GDB_REGNO_CSR0 = 65,
GDB_REGNO_TSELECT = CSR_TSELECT + GDB_REGNO_CSR0,
GDB_REGNO_TDATA1 = CSR_TDATA1 + GDB_REGNO_CSR0,
GDB_REGNO_TDATA2 = CSR_TDATA2 + GDB_REGNO_CSR0,
GDB_REGNO_MISA = CSR_MISA + GDB_REGNO_CSR0,
GDB_REGNO_DPC = CSR_DPC + GDB_REGNO_CSR0,
GDB_REGNO_DCSR = CSR_DCSR + GDB_REGNO_CSR0,
GDB_REGNO_DSCRATCH = CSR_DSCRATCH + GDB_REGNO_CSR0,
GDB_REGNO_MSTATUS = CSR_MSTATUS + GDB_REGNO_CSR0,
GDB_REGNO_CSR4095 = GDB_REGNO_CSR0 + 4095,
GDB_REGNO_PRIV = 4161,
GDB_REGNO_COUNT
};
const char *gdb_regno_name(enum gdb_regno regno);
#endif

310
src/target/riscv/opcodes.h Normal file
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@ -0,0 +1,310 @@
#include "encoding.h"
#define ZERO 0
#define T0 5
#define S0 8
#define S1 9
static uint32_t bits(uint32_t value, unsigned int hi, unsigned int lo)
{
return (value >> lo) & ((1 << (hi+1-lo)) - 1);
}
static uint32_t bit(uint32_t value, unsigned int b)
{
return (value >> b) & 1;
}
static uint32_t jal(unsigned int rd, uint32_t imm) __attribute__ ((unused));
static uint32_t jal(unsigned int rd, uint32_t imm)
{
return (bit(imm, 20) << 31) |
(bits(imm, 10, 1) << 21) |
(bit(imm, 11) << 20) |
(bits(imm, 19, 12) << 12) |
(rd << 7) |
MATCH_JAL;
}
static uint32_t csrsi(unsigned int csr, uint16_t imm) __attribute__ ((unused));
static uint32_t csrsi(unsigned int csr, uint16_t imm)
{
return (csr << 20) |
(bits(imm, 4, 0) << 15) |
MATCH_CSRRSI;
}
static uint32_t sw(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t sw(unsigned int src, unsigned int base, uint16_t offset)
{
return (bits(offset, 11, 5) << 25) |
(src << 20) |
(base << 15) |
(bits(offset, 4, 0) << 7) |
MATCH_SW;
}
static uint32_t sd(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t sd(unsigned int src, unsigned int base, uint16_t offset)
{
return (bits(offset, 11, 5) << 25) |
(src << 20) |
(base << 15) |
(bits(offset, 4, 0) << 7) |
MATCH_SD;
}
static uint32_t sh(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t sh(unsigned int src, unsigned int base, uint16_t offset)
{
return (bits(offset, 11, 5) << 25) |
(src << 20) |
(base << 15) |
(bits(offset, 4, 0) << 7) |
MATCH_SH;
}
static uint32_t sb(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t sb(unsigned int src, unsigned int base, uint16_t offset)
{
return (bits(offset, 11, 5) << 25) |
(src << 20) |
(base << 15) |
(bits(offset, 4, 0) << 7) |
MATCH_SB;
}
static uint32_t ld(unsigned int rd, unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t ld(unsigned int rd, unsigned int base, uint16_t offset)
{
return (bits(offset, 11, 0) << 20) |
(base << 15) |
(bits(rd, 4, 0) << 7) |
MATCH_LD;
}
static uint32_t lw(unsigned int rd, unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t lw(unsigned int rd, unsigned int base, uint16_t offset)
{
return (bits(offset, 11, 0) << 20) |
(base << 15) |
(bits(rd, 4, 0) << 7) |
MATCH_LW;
}
static uint32_t lh(unsigned int rd, unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t lh(unsigned int rd, unsigned int base, uint16_t offset)
{
return (bits(offset, 11, 0) << 20) |
(base << 15) |
(bits(rd, 4, 0) << 7) |
MATCH_LH;
}
static uint32_t lb(unsigned int rd, unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t lb(unsigned int rd, unsigned int base, uint16_t offset)
{
return (bits(offset, 11, 0) << 20) |
(base << 15) |
(bits(rd, 4, 0) << 7) |
MATCH_LB;
}
static uint32_t csrw(unsigned int source, unsigned int csr) __attribute__ ((unused));
static uint32_t csrw(unsigned int source, unsigned int csr)
{
return (csr << 20) | (source << 15) | MATCH_CSRRW;
}
static uint32_t addi(unsigned int dest, unsigned int src, uint16_t imm) __attribute__ ((unused));
static uint32_t addi(unsigned int dest, unsigned int src, uint16_t imm)
{
return (bits(imm, 11, 0) << 20) |
(src << 15) |
(dest << 7) |
MATCH_ADDI;
}
static uint32_t csrr(unsigned int rd, unsigned int csr) __attribute__ ((unused));
static uint32_t csrr(unsigned int rd, unsigned int csr)
{
return (csr << 20) | (rd << 7) | MATCH_CSRRS;
}
static uint32_t csrrs(unsigned int rd, unsigned int rs, unsigned int csr) __attribute__ ((unused));
static uint32_t csrrs(unsigned int rd, unsigned int rs, unsigned int csr)
{
return (csr << 20) | (rs << 15) | (rd << 7) | MATCH_CSRRS;
}
static uint32_t csrrw(unsigned int rd, unsigned int rs, unsigned int csr) __attribute__ ((unused));
static uint32_t csrrw(unsigned int rd, unsigned int rs, unsigned int csr)
{
return (csr << 20) | (rs << 15) | (rd << 7) | MATCH_CSRRW;
}
static uint32_t fsw(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t fsw(unsigned int src, unsigned int base, uint16_t offset)
{
return (bits(offset, 11, 5) << 25) |
(bits(src, 4, 0) << 20) |
(base << 15) |
(bits(offset, 4, 0) << 7) |
MATCH_FSW;
}
static uint32_t fsd(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t fsd(unsigned int src, unsigned int base, uint16_t offset)
{
return (bits(offset, 11, 5) << 25) |
(bits(src, 4, 0) << 20) |
(base << 15) |
(bits(offset, 4, 0) << 7) |
MATCH_FSD;
}
static uint32_t flw(unsigned int dest, unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t flw(unsigned int dest, unsigned int base, uint16_t offset)
{
return (bits(offset, 11, 0) << 20) |
(base << 15) |
(bits(dest, 4, 0) << 7) |
MATCH_FLW;
}
static uint32_t fld(unsigned int dest, unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t fld(unsigned int dest, unsigned int base, uint16_t offset)
{
return (bits(offset, 11, 0) << 20) |
(base << 15) |
(bits(dest, 4, 0) << 7) |
MATCH_FLD;
}
static uint32_t fmv_x_w(unsigned dest, unsigned src) __attribute__ ((unused));
static uint32_t fmv_x_w(unsigned dest, unsigned src)
{
return src << 15 |
dest << 7 |
MATCH_FMV_X_W;
}
static uint32_t fmv_x_d(unsigned dest, unsigned src) __attribute__ ((unused));
static uint32_t fmv_x_d(unsigned dest, unsigned src)
{
return src << 15 |
dest << 7 |
MATCH_FMV_X_D;
}
static uint32_t fmv_w_x(unsigned dest, unsigned src) __attribute__ ((unused));
static uint32_t fmv_w_x(unsigned dest, unsigned src)
{
return src << 15 |
dest << 7 |
MATCH_FMV_W_X;
}
static uint32_t fmv_d_x(unsigned dest, unsigned src) __attribute__ ((unused));
static uint32_t fmv_d_x(unsigned dest, unsigned src)
{
return src << 15 |
dest << 7 |
MATCH_FMV_D_X;
}
static uint32_t ebreak(void) __attribute__ ((unused));
static uint32_t ebreak(void)
{
return MATCH_EBREAK;
}
static uint32_t ebreak_c(void) __attribute__ ((unused));
static uint32_t ebreak_c(void)
{
return MATCH_C_EBREAK;
}
static uint32_t fence_i(void) __attribute__ ((unused));
static uint32_t fence_i(void)
{
return MATCH_FENCE_I;
}
static uint32_t lui(unsigned int dest, uint32_t imm) __attribute__ ((unused));
static uint32_t lui(unsigned int dest, uint32_t imm)
{
return (bits(imm, 19, 0) << 12) |
(dest << 7) |
MATCH_LUI;
}
/*
static uint32_t csrci(unsigned int csr, uint16_t imm) __attribute__ ((unused));
static uint32_t csrci(unsigned int csr, uint16_t imm)
{
return (csr << 20) |
(bits(imm, 4, 0) << 15) |
MATCH_CSRRCI;
}
static uint32_t li(unsigned int dest, uint16_t imm) __attribute__ ((unused));
static uint32_t li(unsigned int dest, uint16_t imm)
{
return addi(dest, 0, imm);
}
static uint32_t fsd(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
static uint32_t fsd(unsigned int src, unsigned int base, uint16_t offset)
{
return (bits(offset, 11, 5) << 25) |
(bits(src, 4, 0) << 20) |
(base << 15) |
(bits(offset, 4, 0) << 7) |
MATCH_FSD;
}
static uint32_t ori(unsigned int dest, unsigned int src, uint16_t imm) __attribute__ ((unused));
static uint32_t ori(unsigned int dest, unsigned int src, uint16_t imm)
{
return (bits(imm, 11, 0) << 20) |
(src << 15) |
(dest << 7) |
MATCH_ORI;
}
static uint32_t nop(void) __attribute__ ((unused));
static uint32_t nop(void)
{
return addi(0, 0, 0);
}
*/
static uint32_t xori(unsigned int dest, unsigned int src, uint16_t imm) __attribute__ ((unused));
static uint32_t xori(unsigned int dest, unsigned int src, uint16_t imm)
{
return (bits(imm, 11, 0) << 20) |
(src << 15) |
(dest << 7) |
MATCH_XORI;
}
static uint32_t srli(unsigned int dest, unsigned int src, uint8_t shamt) __attribute__ ((unused));
static uint32_t srli(unsigned int dest, unsigned int src, uint8_t shamt)
{
return (bits(shamt, 4, 0) << 20) |
(src << 15) |
(dest << 7) |
MATCH_SRLI;
}
static uint32_t fence(void) __attribute__((unused));
static uint32_t fence(void)
{
return MATCH_FENCE;
}
static uint32_t auipc(unsigned int dest) __attribute__((unused));
static uint32_t auipc(unsigned int dest)
{
return MATCH_AUIPC | (dest << 7);
}

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#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 "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_DEBUG_BUFFER_SIZE; ++i)
p->debug_buffer[i] = -1;
return ERROR_OK;
}
int riscv_program_write(struct riscv_program *program)
{
for (unsigned i = 0; i < program->instruction_count; ++i) {
LOG_DEBUG("%p: debug_buffer[%02x] = DASM(0x%08x)", program, i, program->debug_buffer[i]);
if (riscv_write_debug_buffer(program->target, i,
program->debug_buffer[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();
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_DEBUG("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_ERROR("Unable to write ebreak");
for (size_t i = 0; i < riscv_debug_buffer_size(p->target); ++i)
LOG_ERROR("ram[%02x]: DASM(0x%08lx) [0x%08lx]", (int)i, (long)p->debug_buffer[i], (long)p->debug_buffer[i]);
return ERROR_FAIL;
}
if (riscv_program_write(p) != ERROR_OK)
return ERROR_FAIL;
if (riscv_execute_debug_buffer(t) != ERROR_OK) {
LOG_DEBUG("Unable to execute program %p", p);
return ERROR_FAIL;
}
for (size_t i = 0; i < riscv_debug_buffer_size(p->target); ++i)
if (i >= riscv_debug_buffer_size(p->target))
p->debug_buffer[i] = riscv_read_debug_buffer(t, i);
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_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_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_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(struct riscv_program *p)
{
return riscv_program_insert(p, fence());
}
int riscv_program_ebreak(struct riscv_program *p)
{
struct target *target = p->target;
RISCV_INFO(r);
if (p->instruction_count == riscv_debug_buffer_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_debug_buffer_size(p->target)) {
LOG_ERROR("Unable to insert instruction:");
LOG_ERROR(" instruction_count=%d", (int)p->instruction_count);
LOG_ERROR(" buffer size =%d", (int)riscv_debug_buffer_size(p->target));
return ERROR_FAIL;
}
p->debug_buffer[p->instruction_count] = i;
p->instruction_count++;
return ERROR_OK;
}

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#ifndef TARGET__RISCV__PROGRAM_H
#define TARGET__RISCV__PROGRAM_H
#include "riscv.h"
#define RISCV_MAX_DEBUG_BUFFER_SIZE 32
#define RISCV_REGISTER_COUNT 32
#define RISCV_DSCRATCH_COUNT 2
/* The various RISC-V debug specifications all revolve around setting up
* program buffers and executing them on the target. This structure contains a
* single program, which can then be executed on targets. */
struct riscv_program {
struct target *target;
uint32_t debug_buffer[RISCV_MAX_DEBUG_BUFFER_SIZE];
/* Number of 32-bit instructions in the program. */
size_t instruction_count;
/* Side effects of executing this program. These must be accounted for
* in order to maintain correct executing of the target system. */
bool writes_xreg[RISCV_REGISTER_COUNT];
/* XLEN on the target. */
int target_xlen;
};
/* Initializes a program with the header. */
int riscv_program_init(struct riscv_program *p, struct target *t);
/* Write the program to the program buffer. */
int riscv_program_write(struct riscv_program *program);
/* Executes a program, returning 0 if the program successfully executed. Note
* that this may cause registers to be saved or restored, which could result to
* calls to things like riscv_save_register which itself could require a
* program to execute. That's OK, just make sure this eventually terminates.
* */
int riscv_program_exec(struct riscv_program *p, struct target *t);
int riscv_program_load(struct riscv_program *p, struct target *t);
/* Clears a program, removing all the state associated with it. */
int riscv_program_clear(struct riscv_program *p, struct target *t);
/* A lower level interface, you shouldn't use this unless you have a reason. */
int riscv_program_insert(struct riscv_program *p, riscv_insn_t i);
/* There is hardware support for saving at least one register. This register
* doesn't need to be saved/restored the usual way, which is useful during
* early initialization when we can't save/restore arbitrary registerrs to host
* memory. */
int riscv_program_save_to_dscratch(struct riscv_program *p, enum gdb_regno to_save);
/* Helpers to assembly various instructions. Return 0 on success. These might
* assembly into a multi-instruction sequence that overwrites some other
* register, but those will be properly saved and restored. */
int riscv_program_lwr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno a, int o);
int riscv_program_lhr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno a, int o);
int riscv_program_lbr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno a, int o);
int riscv_program_swr(struct riscv_program *p, enum gdb_regno s, enum gdb_regno a, int o);
int riscv_program_shr(struct riscv_program *p, enum gdb_regno s, enum gdb_regno a, int o);
int riscv_program_sbr(struct riscv_program *p, enum gdb_regno s, enum gdb_regno a, int o);
int riscv_program_csrr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno csr);
int riscv_program_csrw(struct riscv_program *p, enum gdb_regno s, enum gdb_regno csr);
int riscv_program_fence_i(struct riscv_program *p);
int riscv_program_fence(struct riscv_program *p);
int riscv_program_ebreak(struct riscv_program *p);
int riscv_program_addi(struct riscv_program *p, enum gdb_regno d, enum gdb_regno s, int16_t i);
#endif

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#ifndef RISCV_H
#define RISCV_H
struct riscv_program;
#include <stdint.h>
#include "opcodes.h"
#include "gdb_regs.h"
/* The register cache is statically allocated. */
#define RISCV_MAX_HARTS 32
#define RISCV_MAX_REGISTERS 5000
#define RISCV_MAX_TRIGGERS 32
#define RISCV_MAX_HWBPS 16
#define DEFAULT_COMMAND_TIMEOUT_SEC 2
#define DEFAULT_RESET_TIMEOUT_SEC 30
extern struct target_type riscv011_target;
extern struct target_type riscv013_target;
/*
* Definitions shared by code supporting all RISC-V versions.
*/
typedef uint64_t riscv_reg_t;
typedef uint32_t riscv_insn_t;
typedef uint64_t riscv_addr_t;
enum riscv_halt_reason {
RISCV_HALT_INTERRUPT,
RISCV_HALT_BREAKPOINT,
RISCV_HALT_SINGLESTEP,
RISCV_HALT_TRIGGER,
RISCV_HALT_UNKNOWN,
RISCV_HALT_ERROR
};
typedef struct {
unsigned dtm_version;
struct command_context *cmd_ctx;
void *version_specific;
/* The number of harts on this system. */
int hart_count;
/* The hart that the RTOS thinks is currently being debugged. */
int rtos_hartid;
/* The hart that is currently being debugged. Note that this is
* different than the hartid that the RTOS is expected to use. This
* one will change all the time, it's more of a global argument to
* every function than an actual */
int current_hartid;
/* Enough space to store all the registers we might need to save. */
/* FIXME: This should probably be a bunch of register caches. */
uint64_t saved_registers[RISCV_MAX_HARTS][RISCV_MAX_REGISTERS];
bool valid_saved_registers[RISCV_MAX_HARTS][RISCV_MAX_REGISTERS];
/* OpenOCD's register cache points into here. This is not per-hart because
* we just invalidate the entire cache when we change which hart is
* selected. */
uint64_t reg_cache_values[RISCV_MAX_REGISTERS];
/* Single buffer that contains all register names, instead of calling
* malloc for each register. Needs to be freed when reg_list is freed. */
char *reg_names;
/* It's possible that each core has a different supported ISA set. */
int xlen[RISCV_MAX_HARTS];
riscv_reg_t misa[RISCV_MAX_HARTS];
/* The number of triggers per hart. */
unsigned trigger_count[RISCV_MAX_HARTS];
/* For each physical trigger, contains -1 if the hwbp is available, or the
* unique_id of the breakpoint/watchpoint that is using it.
* Note that in RTOS mode the triggers are the same across all harts the
* target controls, while otherwise only a single hart is controlled. */
int trigger_unique_id[RISCV_MAX_HWBPS];
/* The number of entries in the debug buffer. */
int debug_buffer_size[RISCV_MAX_HARTS];
/* This avoids invalidating the register cache too often. */
bool registers_initialized;
/* This hart contains an implicit ebreak at the end of the program buffer. */
bool impebreak;
bool triggers_enumerated;
/* Helper functions that target the various RISC-V debug spec
* implementations. */
int (*get_register)(struct target *target,
riscv_reg_t *value, int hid, int rid);
int (*set_register)(struct target *, int hartid, int regid,
uint64_t value);
int (*select_current_hart)(struct target *);
bool (*is_halted)(struct target *target);
int (*halt_current_hart)(struct target *);
int (*resume_current_hart)(struct target *target);
int (*step_current_hart)(struct target *target);
int (*on_halt)(struct target *target);
int (*on_resume)(struct target *target);
int (*on_step)(struct target *target);
enum riscv_halt_reason (*halt_reason)(struct target *target);
int (*write_debug_buffer)(struct target *target, unsigned index,
riscv_insn_t d);
riscv_insn_t (*read_debug_buffer)(struct target *target, unsigned index);
int (*execute_debug_buffer)(struct target *target);
int (*dmi_write_u64_bits)(struct target *target);
void (*fill_dmi_write_u64)(struct target *target, char *buf, int a, uint64_t d);
void (*fill_dmi_read_u64)(struct target *target, char *buf, int a);
void (*fill_dmi_nop_u64)(struct target *target, char *buf);
int (*authdata_read)(struct target *target, uint32_t *value);
int (*authdata_write)(struct target *target, uint32_t value);
int (*dmi_read)(struct target *target, uint32_t *value, uint32_t address);
int (*dmi_write)(struct target *target, uint32_t address, uint32_t value);
} riscv_info_t;
/* Wall-clock timeout for a command/access. Settable via RISC-V Target commands.*/
extern int riscv_command_timeout_sec;
/* Wall-clock timeout after reset. Settable via RISC-V Target commands.*/
extern int riscv_reset_timeout_sec;
extern bool riscv_prefer_sba;
/* Everything needs the RISC-V specific info structure, so here's a nice macro
* that provides that. */
static inline riscv_info_t *riscv_info(const struct target *target) __attribute__((unused));
static inline riscv_info_t *riscv_info(const struct target *target)
{ return target->arch_info; }
#define RISCV_INFO(R) riscv_info_t *R = riscv_info(target);
extern uint8_t ir_dtmcontrol[1];
extern struct scan_field select_dtmcontrol;
extern uint8_t ir_dbus[1];
extern struct scan_field select_dbus;
extern uint8_t ir_idcode[1];
extern struct scan_field select_idcode;
/*** OpenOCD Interface */
int riscv_openocd_poll(struct target *target);
int riscv_openocd_halt(struct target *target);
int riscv_openocd_resume(
struct target *target,
int current,
target_addr_t address,
int handle_breakpoints,
int debug_execution
);
int riscv_openocd_step(
struct target *target,
int current,
target_addr_t address,
int handle_breakpoints
);
int riscv_openocd_assert_reset(struct target *target);
int riscv_openocd_deassert_reset(struct target *target);
/*** RISC-V Interface ***/
/* Initializes the shared RISC-V structure. */
void riscv_info_init(struct target *target, riscv_info_t *r);
/* Run control, possibly for multiple harts. The _all_harts versions resume
* all the enabled harts, which when running in RTOS mode is all the harts on
* the system. */
int riscv_halt_all_harts(struct target *target);
int riscv_halt_one_hart(struct target *target, int hartid);
int riscv_resume_all_harts(struct target *target);
int riscv_resume_one_hart(struct target *target, int hartid);
/* Steps the hart that's currently selected in the RTOS, or if there is no RTOS
* then the only hart. */
int riscv_step_rtos_hart(struct target *target);
bool riscv_supports_extension(struct target *target, int hartid, char letter);
/* Returns XLEN for the given (or current) hart. */
int riscv_xlen(const struct target *target);
int riscv_xlen_of_hart(const struct target *target, int hartid);
bool riscv_rtos_enabled(const struct target *target);
/* Sets the current hart, which is the hart that will actually be used when
* issuing debug commands. */
int riscv_set_current_hartid(struct target *target, int hartid);
int riscv_current_hartid(const struct target *target);
/*** Support functions for the RISC-V 'RTOS', which provides multihart support
* without requiring multiple targets. */
/* When using the RTOS to debug, this selects the hart that is currently being
* debugged. This doesn't propogate to the hardware. */
void riscv_set_all_rtos_harts(struct target *target);
void riscv_set_rtos_hartid(struct target *target, int hartid);
/* Lists the number of harts in the system, which are assumed to be
* concecutive and start with mhartid=0. */
int riscv_count_harts(struct target *target);
/* Returns TRUE if the target has the given register on the given hart. */
bool riscv_has_register(struct target *target, int hartid, int regid);
/* Returns the value of the given register on the given hart. 32-bit registers
* are zero extended to 64 bits. */
int riscv_set_register(struct target *target, enum gdb_regno i, riscv_reg_t v);
int riscv_set_register_on_hart(struct target *target, int hid, enum gdb_regno rid, uint64_t v);
int riscv_get_register(struct target *target, riscv_reg_t *value,
enum gdb_regno r);
int riscv_get_register_on_hart(struct target *target, riscv_reg_t *value,
int hartid, enum gdb_regno regid);
/* Checks the state of the current hart -- "is_halted" checks the actual
* on-device register. */
bool riscv_is_halted(struct target *target);
enum riscv_halt_reason riscv_halt_reason(struct target *target, int hartid);
/* These helper functions let the generic program interface get target-specific
* information. */
size_t riscv_debug_buffer_size(struct target *target);
riscv_insn_t riscv_read_debug_buffer(struct target *target, int index);
int riscv_write_debug_buffer(struct target *target, int index, riscv_insn_t insn);
int riscv_execute_debug_buffer(struct target *target);
void riscv_fill_dmi_nop_u64(struct target *target, char *buf);
void riscv_fill_dmi_write_u64(struct target *target, char *buf, int a, uint64_t d);
void riscv_fill_dmi_read_u64(struct target *target, char *buf, int a);
int riscv_dmi_write_u64_bits(struct target *target);
/* Invalidates the register cache. */
void riscv_invalidate_register_cache(struct target *target);
/* Returns TRUE when a hart is enabled in this target. */
bool riscv_hart_enabled(struct target *target, int hartid);
int riscv_enumerate_triggers(struct target *target);
int riscv_add_breakpoint(struct target *target, struct breakpoint *breakpoint);
int riscv_remove_breakpoint(struct target *target,
struct breakpoint *breakpoint);
int riscv_add_watchpoint(struct target *target, struct watchpoint *watchpoint);
int riscv_remove_watchpoint(struct target *target,
struct watchpoint *watchpoint);
int riscv_init_registers(struct target *target);
void riscv_semihosting_init(struct target *target);
int riscv_semihosting(struct target *target, int *retval);
#endif

194
src/target/riscv/riscv_semihosting.c Normal file
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@ -0,0 +1,194 @@
/***************************************************************************
* Copyright (C) 2018 by Liviu Ionescu *
* ilg@livius.net *
* *
* Copyright (C) 2009 by Marvell Technology Group Ltd. *
* Written by Nicolas Pitre <nico@marvell.com> *
* *
* Copyright (C) 2010 by Spencer Oliver *
* spen@spen-soft.co.uk *
* *
* Copyright (C) 2016 by Square, Inc. *
* Steven Stallion <stallion@squareup.com> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
***************************************************************************/
/**
* @file
* Hold RISC-V semihosting support.
*
* The RISC-V code is inspired from ARM semihosting.
*
* Details can be found in chapter 8 of DUI0203I_rvct_developer_guide.pdf
* from ARM Ltd.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "log.h"
#include "target/target.h"
#include "target/semihosting_common.h"
#include "riscv.h"
static int riscv_semihosting_setup(struct target *target, int enable);
static int riscv_semihosting_post_result(struct target *target);
/**
* Initialize RISC-V semihosting. Use common ARM code.
*/
void riscv_semihosting_init(struct target *target)
{
semihosting_common_init(target, riscv_semihosting_setup,
riscv_semihosting_post_result);
}
/**
* Check for and process a semihosting request using the ARM protocol). This
* is meant to be called when the target is stopped due to a debug mode entry.
* If the value 0 is returned then there was nothing to process. A non-zero
* return value signifies that a request was processed and the target resumed,
* or an error was encountered, in which case the caller must return
* immediately.
*
* @param target Pointer to the target to process.
* @param retval Pointer to a location where the return code will be stored
* @return non-zero value if a request was processed or an error encountered
*/
int riscv_semihosting(struct target *target, int *retval)
{
struct semihosting *semihosting = target->semihosting;
if (!semihosting)
return 0;
if (!semihosting->is_active)
return 0;
riscv_reg_t dpc;
int result = riscv_get_register(target, &dpc, GDB_REGNO_DPC);
if (result != ERROR_OK)
return 0;
uint8_t tmp[12];
/* Read the current instruction, including the bracketing */
*retval = target_read_memory(target, dpc - 4, 2, 6, tmp);
if (*retval != ERROR_OK)
return 0;
/*
* The instructions that trigger a semihosting call,
* always uncompressed, should look like:
*
* 01f01013 slli zero,zero,0x1f
* 00100073 ebreak
* 40705013 srai zero,zero,0x7
*/
uint32_t pre = target_buffer_get_u32(target, tmp);
uint32_t ebreak = target_buffer_get_u32(target, tmp + 4);
uint32_t post = target_buffer_get_u32(target, tmp + 8);
LOG_DEBUG("check %08x %08x %08x from 0x%" PRIx64 "-4", pre, ebreak, post, dpc);
if (pre != 0x01f01013 || ebreak != 0x00100073 || post != 0x40705013) {
/* Not the magic sequence defining semihosting. */
return 0;
}
/*
* Perform semihosting call if we are not waiting on a fileio
* operation to complete.
*/
if (!semihosting->hit_fileio) {
/* RISC-V uses A0 and A1 to pass function arguments */
riscv_reg_t r0;
riscv_reg_t r1;
result = riscv_get_register(target, &r0, GDB_REGNO_A0);
if (result != ERROR_OK)
return 0;
result = riscv_get_register(target, &r1, GDB_REGNO_A1);
if (result != ERROR_OK)
return 0;
semihosting->op = r0;
semihosting->param = r1;
semihosting->word_size_bytes = riscv_xlen(target) / 8;
/* Check for ARM operation numbers. */
if (0 <= semihosting->op && semihosting->op <= 0x31) {
*retval = semihosting_common(target);
if (*retval != ERROR_OK) {
LOG_ERROR("Failed semihosting operation");
return 0;
}
} else {
/* Unknown operation number, not a semihosting call. */
return 0;
}
}
/*
* Resume target if we are not waiting on a fileio
* operation to complete.
*/
if (semihosting->is_resumable && !semihosting->hit_fileio) {
/* Resume right after the EBREAK 4 bytes instruction. */
*retval = target_resume(target, 0, dpc+4, 0, 0);
if (*retval != ERROR_OK) {
LOG_ERROR("Failed to resume target");
return 0;
}
return 1;
}
return 0;
}
/* -------------------------------------------------------------------------
* Local functions. */
/**
* Called via semihosting->setup() later, after the target is known,
* usually on the first semihosting command.
*/
static int riscv_semihosting_setup(struct target *target, int enable)
{
LOG_DEBUG("enable=%d", enable);
struct semihosting *semihosting = target->semihosting;
if (semihosting)
semihosting->setup_time = clock();
return ERROR_OK;
}
static int riscv_semihosting_post_result(struct target *target)
{
struct semihosting *semihosting = target->semihosting;
if (!semihosting) {
/* If not enabled, silently ignored. */
return 0;
}
LOG_DEBUG("0x%" PRIx64, semihosting->result);
riscv_set_register(target, GDB_REGNO_A0, semihosting->result);
return 0;
}

2
src/target/target.c
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@ -107,6 +107,7 @@ extern struct target_type or1k_target;
extern struct target_type quark_x10xx_target; extern struct target_type quark_x10xx_target;
extern struct target_type quark_d20xx_target; extern struct target_type quark_d20xx_target;
extern struct target_type stm8_target; extern struct target_type stm8_target;
extern struct target_type riscv_target;
static struct target_type *target_types[] = { static struct target_type *target_types[] = {
&arm7tdmi_target, &arm7tdmi_target,
@ -139,6 +140,7 @@ static struct target_type *target_types[] = {
&quark_x10xx_target, &quark_x10xx_target,
&quark_d20xx_target, &quark_d20xx_target,
&stm8_target, &stm8_target,
&riscv_target,
#if BUILD_TARGET64 #if BUILD_TARGET64
&aarch64_target, &aarch64_target,
#endif #endif

22
tcl/board/sifive-e31arty.cfg Normal file
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@ -0,0 +1,22 @@
#
# Be sure you include the speed and interface before this file
# Example:
# -c "adapter_khz 5000" -f "interface/ftdi/olimex-arm-usb-tiny-h.cfg" -f "board/sifive-e31arty.cfg"
set _CHIPNAME riscv
jtag newtap $_CHIPNAME cpu -irlen 5 -expected-id 0x20000001
set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME.0 riscv -chain-position $_TARGETNAME
$_TARGETNAME.0 configure -work-area-phys 0x80000000 -work-area-size 10000 -work-area-backup 1
flash bank spi0 fespi 0x40000000 0 0 0 $_TARGETNAME.0 0x20004000
init
if {[ info exists pulse_srst]} {
ftdi_set_signal nSRST 0
ftdi_set_signal nSRST z
}
halt
flash protect 0 64 last off
echo "Ready for Remote Connections"

22
tcl/board/sifive-e51arty.cfg Normal file
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@ -0,0 +1,22 @@
#
# Be sure you include the speed and interface before this file
# Example:
# -c "adapter_khz 5000" -f "interface/ftdi/olimex-arm-usb-tiny-h.cfg" -f "board/sifive-e51arty.cfg"
set _CHIPNAME riscv
jtag newtap $_CHIPNAME cpu -irlen 5 -expected-id 0x20000001
set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME.0 riscv -chain-position $_TARGETNAME
$_TARGETNAME.0 configure -work-area-phys 0x80000000 -work-area-size 10000 -work-area-backup 1
flash bank spi0 fespi 0x40000000 0 0 0 $_TARGETNAME.0 0x20004000
init
if {[ info exists pulse_srst]} {
ftdi_set_signal nSRST 0
ftdi_set_signal nSRST z
}
halt
flash protect 0 64 last off
echo "Ready for Remote Connections"

34
tcl/board/sifive-hifive1.cfg Normal file
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@ -0,0 +1,34 @@
adapter_khz 10000
interface ftdi
ftdi_device_desc "Dual RS232-HS"
ftdi_vid_pid 0x0403 0x6010
ftdi_layout_init 0x0008 0x001b
ftdi_layout_signal nSRST -oe 0x0020 -data 0x0020
#Reset Stretcher logic on FE310 is ~1 second long
#This doesn't apply if you use
# ftdi_set_signal, but still good to document
#adapter_nsrst_delay 1500
set _CHIPNAME riscv
jtag newtap $_CHIPNAME cpu -irlen 5 -expected-id 0x10e31913
set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME riscv -chain-position $_TARGETNAME
$_TARGETNAME configure -work-area-phys 0x80000000 -work-area-size 10000 -work-area-backup 1
flash bank onboard_spi_flash fespi 0x20000000 0 0 0 $_TARGETNAME
init
#reset -- This type of reset is not implemented yet
if {[ info exists pulse_srst]} {
ftdi_set_signal nSRST 0
ftdi_set_signal nSRST z
#Wait for the reset stretcher
#It will work without this, but
#will incur lots of delays for later commands.
sleep 1500
}
halt
flash protect 0 64 last off