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// SPDX-License-Identifier: GPL-2.0-or-later
/***************************************************************************
* Xtensa Target File-I/O Support for OpenOCD *
* Copyright (C) 2020-2023 Cadence Design Systems, Inc. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "xtensa_chip.h"
#include "xtensa_fileio.h"
#include "xtensa.h"
#define XTENSA_SYSCALL(x) XT_INS_BREAK(x, 1, 14)
#define XTENSA_SYSCALL_SZ 3
#define XTENSA_SYSCALL_LEN_MAX 255
int xtensa_fileio_init(struct target *target)
{
char *idmem = malloc(XTENSA_SYSCALL_LEN_MAX + 1);
target->fileio_info = malloc(sizeof(struct gdb_fileio_info));
if (!idmem || !target->fileio_info) {
LOG_TARGET_ERROR(target, "Out of memory!");
free(idmem);
free(target->fileio_info);
return ERROR_FAIL;
}
target->fileio_info->identifier = idmem;
return ERROR_OK;
}
/**
* Checks for and processes an Xtensa File-IO request.
*
* Return ERROR_OK if request was found and handled; or
* return ERROR_FAIL if no request was detected.
*/
int xtensa_fileio_detect_proc(struct target *target)
{
struct xtensa *xtensa = target_to_xtensa(target);
int retval;
xtensa_reg_val_t dbg_cause = xtensa_cause_get(target);
if ((dbg_cause & (DEBUGCAUSE_BI | DEBUGCAUSE_BN)) == 0 || xtensa->halt_request)
return ERROR_FAIL;
uint8_t brk_insn_buf[sizeof(uint32_t)] = {0};
xtensa_reg_val_t pc = xtensa_reg_get(target, XT_REG_IDX_PC);
retval = target_read_memory(target,
pc,
XTENSA_SYSCALL_SZ,
1,
(uint8_t *)brk_insn_buf);
if (retval != ERROR_OK) {
LOG_ERROR("Failed to read break instruction!");
return ERROR_FAIL;
}
if (buf_get_u32(brk_insn_buf, 0, 32) != XTENSA_SYSCALL(xtensa))
return ERROR_FAIL;
LOG_TARGET_DEBUG(target, "File-I/O: syscall breakpoint found at 0x%x", pc);
xtensa->proc_syscall = true;
return ERROR_OK;
}
int xtensa_get_gdb_fileio_info(struct target *target, struct gdb_fileio_info *fileio_info)
{
/* fill syscall parameters to file-I/O info */
if (!fileio_info) {
LOG_ERROR("File-I/O data structure uninitialized");
return ERROR_FAIL;
}
struct xtensa *xtensa = target_to_xtensa(target);
if (!xtensa->proc_syscall)
return ERROR_FAIL;
xtensa_reg_val_t syscall = xtensa_reg_get(target, XTENSA_SYSCALL_OP_REG);
xtensa_reg_val_t arg0 = xtensa_reg_get(target, XT_REG_IDX_A6);
xtensa_reg_val_t arg1 = xtensa_reg_get(target, XT_REG_IDX_A3);
xtensa_reg_val_t arg2 = xtensa_reg_get(target, XT_REG_IDX_A4);
xtensa_reg_val_t arg3 = xtensa_reg_get(target, XT_REG_IDX_A5);
int retval = ERROR_OK;
LOG_TARGET_DEBUG(target, "File-I/O: syscall 0x%x 0x%x 0x%x 0x%x 0x%x",
syscall, arg0, arg1, arg2, arg3);
switch (syscall) {
case XTENSA_SYSCALL_OPEN:
snprintf(fileio_info->identifier, XTENSA_SYSCALL_LEN_MAX, "open");
fileio_info->param_1 = arg0; // pathp
fileio_info->param_2 = arg3; // len
fileio_info->param_3 = arg1; // flags
fileio_info->param_4 = arg2; // mode
break;
case XTENSA_SYSCALL_CLOSE:
snprintf(fileio_info->identifier, XTENSA_SYSCALL_LEN_MAX, "close");
fileio_info->param_1 = arg0; // fd
break;
case XTENSA_SYSCALL_READ:
snprintf(fileio_info->identifier, XTENSA_SYSCALL_LEN_MAX, "read");
fileio_info->param_1 = arg0; // fd
fileio_info->param_2 = arg1; // bufp
fileio_info->param_3 = arg2; // count
break;
case XTENSA_SYSCALL_WRITE:
snprintf(fileio_info->identifier, XTENSA_SYSCALL_LEN_MAX, "write");
fileio_info->param_1 = arg0; // fd
fileio_info->param_2 = arg1; // bufp
fileio_info->param_3 = arg2; // count
break;
case XTENSA_SYSCALL_LSEEK:
snprintf(fileio_info->identifier, XTENSA_SYSCALL_LEN_MAX, "lseek");
fileio_info->param_1 = arg0; // fd
fileio_info->param_2 = arg1; // offset
fileio_info->param_3 = arg2; // flags
break;
case XTENSA_SYSCALL_RENAME:
snprintf(fileio_info->identifier, XTENSA_SYSCALL_LEN_MAX, "rename");
fileio_info->param_1 = arg0; // old pathp
fileio_info->param_2 = arg3; // old len
fileio_info->param_3 = arg1; // new pathp
fileio_info->param_4 = arg2; // new len
break;
case XTENSA_SYSCALL_UNLINK:
snprintf(fileio_info->identifier, XTENSA_SYSCALL_LEN_MAX, "unlink");
fileio_info->param_1 = arg0; // pathnamep
fileio_info->param_2 = arg1; // len
break;
case XTENSA_SYSCALL_STAT:
snprintf(fileio_info->identifier, XTENSA_SYSCALL_LEN_MAX, "stat");
fileio_info->param_1 = arg0; // pathnamep
fileio_info->param_2 = arg2; // len
fileio_info->param_3 = arg1; // bufp
break;
case XTENSA_SYSCALL_FSTAT:
snprintf(fileio_info->identifier, XTENSA_SYSCALL_LEN_MAX, "fstat");
fileio_info->param_1 = arg0; // fd
fileio_info->param_2 = arg1; // bufp
break;
case XTENSA_SYSCALL_GETTIMEOFDAY:
snprintf(fileio_info->identifier, XTENSA_SYSCALL_LEN_MAX, "gettimeofday");
fileio_info->param_1 = arg0; // tvp
fileio_info->param_2 = arg1; // tzp
break;
case XTENSA_SYSCALL_ISATTY:
snprintf(fileio_info->identifier, XTENSA_SYSCALL_LEN_MAX, "isatty");
fileio_info->param_1 = arg0; // fd
break;
case XTENSA_SYSCALL_SYSTEM:
snprintf(fileio_info->identifier, XTENSA_SYSCALL_LEN_MAX, "system");
fileio_info->param_1 = arg0; // cmdp
fileio_info->param_2 = arg1; // len
break;
default:
snprintf(fileio_info->identifier, XTENSA_SYSCALL_LEN_MAX, "unknown");
LOG_TARGET_DEBUG(target, "File-I/O: syscall unknown (%d), pc=0x%08X",
syscall, xtensa_reg_get(target, XT_REG_IDX_PC));
LOG_INFO("File-I/O: syscall unknown (%d), pc=0x%08X",
syscall, xtensa_reg_get(target, XT_REG_IDX_PC));
retval = ERROR_FAIL;
break;
}
return retval;
}
int xtensa_gdb_fileio_end(struct target *target, int retcode, int fileio_errno, bool ctrl_c)
{
struct xtensa *xtensa = target_to_xtensa(target);
if (!xtensa->proc_syscall)
return ERROR_FAIL;
LOG_TARGET_DEBUG(target, "File-I/O: syscall return code: 0x%x, errno: 0x%x , ctrl_c: %s",
retcode, fileio_errno, ctrl_c ? "true" : "false");
/* If interrupt was requested before FIO completion (ERRNO==4), halt and repeat
* syscall. Otherwise, set File-I/O Ax and underlying ARx registers, increment PC.
* NOTE: sporadic cases of ((ERRNO==4) && !ctrl_c) were observed; most have ctrl_c.
*/
if (fileio_errno != 4) {
xtensa_reg_set_deep_relgen(target, XTENSA_SYSCALL_RETVAL_REG, retcode);
xtensa_reg_set_deep_relgen(target, XTENSA_SYSCALL_ERRNO_REG, fileio_errno);
xtensa_reg_val_t pc = xtensa_reg_get(target, XT_REG_IDX_PC);
xtensa_reg_set(target, XT_REG_IDX_PC, pc + XTENSA_SYSCALL_SZ);
}
xtensa->proc_syscall = false;
xtensa->halt_request = true;
return ctrl_c ? ERROR_FAIL : ERROR_OK;
}
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