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gdb_server: support File-I/O Remote Protocol Extension

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The File I/O remote protocol extension allows the target to use the
host's file system and console I/O to perform various system calls.

To use the function, targets need to prepare two callback functions:
* get_gdb_finish_info: to get file I/O parameters from target
* gdb_fileio_end: pass file I/O response to target

As target is halted, gdb_server will try to get file-I/O information
from target through target_get_gdb_fileio_info(). If the callback function
returns ERROR_OK, gdb_server will initiate a file-I/O request to gdb.
After gdb finishes system call, gdb will pass response of the system call
to target through target_gdb_fileio_end() and continue to run(continue or step).

To implement the function, I add a new data structure in struct target,
called struct gdb_fileio_info, to record file I/O name and parameters.

Details refer to GDB manual "File-I/O Remote Protocol Extension"

Change-Id: I7f4d45e7c9e967b6d898dc79ba01d86bc46315d3
Signed-off-by: Hsiangkai Wang <hsiangkai@gmail.com>
Reviewed-on: http://openocd.zylin.com/1102
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
This commit is contained in:
Hsiangkai Wang
2013-01-02 12:02:00 +08:00
committed by Spencer Oliver
parent 80d412bafc
commit 0a4c8990c2
9 changed files with 776 additions and 49 deletions
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155
src/target/nds32_v3_common.c
View File

@@ -29,6 +29,18 @@
#include "nds32_aice.h"
#include "nds32_v3_common.h"
static struct breakpoint syscall_breakpoint = {
0x80,
0,
4,
BKPT_SOFT,
0,
NULL,
NULL,
0x515CA11,
0,
};
static struct nds32_v3_common_callback *v3_common_callback;
static int nds32_v3_register_mapping(struct nds32 *nds32, int reg_no)
@@ -80,6 +92,22 @@ static int nds32_v3_debug_entry(struct nds32 *nds32, bool enable_watchpoint)
if (enable_watchpoint)
CHECK_RETVAL(v3_common_callback->deactivate_hardware_watchpoint(nds32->target));
if (nds32->virtual_hosting) {
if (syscall_breakpoint.set) {
/** disable virtual hosting */
/* remove breakpoint at syscall entry */
target_remove_breakpoint(nds32->target, &syscall_breakpoint);
syscall_breakpoint.set = 0;
uint32_t value_pc;
nds32_get_mapped_reg(nds32, PC, &value_pc);
if (value_pc == syscall_breakpoint.address)
/** process syscall for virtual hosting */
nds32->hit_syscall = true;
}
}
if (ERROR_OK != nds32_examine_debug_reason(nds32)) {
nds32->target->state = backup_state;
@@ -132,6 +160,74 @@ static int nds32_v3_leave_debug_state(struct nds32 *nds32, bool enable_watchpoin
*/
CHECK_RETVAL(nds32_restore_context(target));
if (nds32->virtual_hosting) {
/** enable virtual hosting */
uint32_t value_ir3;
uint32_t entry_size;
uint32_t syscall_address;
/* get syscall entry address */
nds32_get_mapped_reg(nds32, IR3, &value_ir3);
entry_size = 0x4 << (((value_ir3 >> 14) & 0x3) << 1);
syscall_address = (value_ir3 & 0xFFFF0000) + entry_size * 8; /* The index of SYSCALL is 8 */
if (nds32->hit_syscall) {
/* single step to skip syscall entry */
/* use IRET to skip syscall */
struct aice_port_s *aice = target_to_aice(target);
uint32_t value_ir9;
uint32_t value_ir6;
uint32_t syscall_id;
nds32_get_mapped_reg(nds32, IR6, &value_ir6);
syscall_id = (value_ir6 >> 16) & 0x7FFF;
if (syscall_id == NDS32_SYSCALL_EXIT) {
/* If target hits exit syscall, do not use IRET to skip handler. */
aice_step(aice);
} else {
/* use api->read/write_reg to skip nds32 register cache */
uint32_t value_dimbr;
aice_read_debug_reg(aice, NDS_EDM_SR_DIMBR, &value_dimbr);
aice_write_register(aice, IR11, value_dimbr + 0xC);
aice_read_register(aice, IR9, &value_ir9);
value_ir9 += 4; /* syscall is always 4 bytes */
aice_write_register(aice, IR9, value_ir9);
/* backup hardware breakpoint 0 */
uint32_t backup_bpa, backup_bpam, backup_bpc;
aice_read_debug_reg(aice, NDS_EDM_SR_BPA0, &backup_bpa);
aice_read_debug_reg(aice, NDS_EDM_SR_BPAM0, &backup_bpam);
aice_read_debug_reg(aice, NDS_EDM_SR_BPC0, &backup_bpc);
/* use hardware breakpoint 0 to stop cpu after skipping syscall */
aice_write_debug_reg(aice, NDS_EDM_SR_BPA0, value_ir9);
aice_write_debug_reg(aice, NDS_EDM_SR_BPAM0, 0);
aice_write_debug_reg(aice, NDS_EDM_SR_BPC0, 0xA);
/* Execute two IRET.
* First IRET is used to quit debug mode.
* Second IRET is used to quit current syscall. */
uint32_t dim_inst[4] = {NOP, NOP, IRET, IRET};
aice_execute(aice, dim_inst, 4);
/* restore origin hardware breakpoint 0 */
aice_write_debug_reg(aice, NDS_EDM_SR_BPA0, backup_bpa);
aice_write_debug_reg(aice, NDS_EDM_SR_BPAM0, backup_bpam);
aice_write_debug_reg(aice, NDS_EDM_SR_BPC0, backup_bpc);
}
nds32->hit_syscall = false;
}
/* insert breakpoint at syscall entry */
syscall_breakpoint.address = syscall_address;
syscall_breakpoint.type = BKPT_SOFT;
syscall_breakpoint.set = 1;
target_add_breakpoint(target, &syscall_breakpoint);
}
/* enable polling */
jtag_poll_set_enabled(true);
@@ -398,7 +494,27 @@ int nds32_v3_read_buffer(struct target *target, uint32_t address,
else
return ERROR_FAIL;
return nds32_read_buffer(target, address, size, buffer);
int result;
struct aice_port_s *aice = target_to_aice(target);
/* give arbitrary initial value to avoid warning messages */
enum nds_memory_access origin_access_channel = NDS_MEMORY_ACC_CPU;
if (nds32->hit_syscall) {
/* Use bus mode to access memory during virtual hosting */
origin_access_channel = memory->access_channel;
memory->access_channel = NDS_MEMORY_ACC_BUS;
aice_memory_access(aice, NDS_MEMORY_ACC_BUS);
}
result = nds32_read_buffer(target, address, size, buffer);
if (nds32->hit_syscall) {
/* Restore access_channel after virtual hosting */
memory->access_channel = origin_access_channel;
aice_memory_access(aice, origin_access_channel);
}
return result;
}
int nds32_v3_write_buffer(struct target *target, uint32_t address,
@@ -436,6 +552,24 @@ int nds32_v3_write_buffer(struct target *target, uint32_t address,
else
return ERROR_FAIL;
if (nds32->hit_syscall) {
/* Use bus mode to access memory during virtual hosting */
struct aice_port_s *aice = target_to_aice(target);
enum nds_memory_access origin_access_channel;
int result;
origin_access_channel = memory->access_channel;
memory->access_channel = NDS_MEMORY_ACC_BUS;
aice_memory_access(aice, NDS_MEMORY_ACC_BUS);
result = nds32_gdb_fileio_write_memory(nds32, address, size, buffer);
memory->access_channel = origin_access_channel;
aice_memory_access(aice, origin_access_channel);
return result;
}
return nds32_write_buffer(target, address, size, buffer);
}
@@ -474,10 +608,26 @@ int nds32_v3_read_memory(struct target *target, uint32_t address,
else
return ERROR_FAIL;
struct aice_port_s *aice = target_to_aice(target);
/* give arbitrary initial value to avoid warning messages */
enum nds_memory_access origin_access_channel = NDS_MEMORY_ACC_CPU;
int result;
if (nds32->hit_syscall) {
/* Use bus mode to access memory during virtual hosting */
origin_access_channel = memory->access_channel;
memory->access_channel = NDS_MEMORY_ACC_BUS;
aice_memory_access(aice, NDS_MEMORY_ACC_BUS);
}
result = nds32_read_memory(target, address, size, count, buffer);
if (nds32->hit_syscall) {
/* Restore access_channel after virtual hosting */
memory->access_channel = origin_access_channel;
aice_memory_access(aice, origin_access_channel);
}
return result;
}
@@ -527,5 +677,8 @@ int nds32_v3_init_target(struct command_context *cmd_ctx,
nds32_init(nds32);
target->fileio_info = malloc(sizeof(struct gdb_fileio_info));
target->fileio_info->identifier = NULL;
return ERROR_OK;
}