src/rtos/linux.c


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// SPDX-License-Identifier: GPL-2.0-or-later

/***************************************************************************
 *   Copyright (C) 2011 by STEricsson                                      *
 *   Heythem Bouhaja heythem.bouhaja@stericsson.com   : creation           *
 *   Michel JAOUEN michel.jaouen@stericsson.com : adaptation to rtos       *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <helper/time_support.h>
#include <jtag/jtag.h>
#include "target/target.h"
#include "target/target_type.h"
#include "helper/log.h"
#include "helper/types.h"
#include "rtos.h"
#include "rtos_standard_stackings.h"
#include <target/register.h>
#include <target/smp.h>
#include "server/gdb_server.h"

#define LINUX_USER_KERNEL_BORDER 0xc0000000
#include "linux_header.h"
#define PHYS
#define MAX_THREADS 200
/*  specific task  */
struct linux_os {
	const char *name;
	uint32_t init_task_addr;
	int thread_count;
	int threadid_count;
	int preupdtate_threadid_count;
	int nr_cpus;
	int threads_lookup;
	int threads_needs_update;
	struct current_thread *current_threads;
	struct threads *thread_list;
	/*  virt2phys parameter */
	uint32_t phys_mask;
	uint32_t phys_base;
};

struct current_thread {
	int64_t threadid;
	int32_t core_id;
#ifdef PID_CHECK
	uint32_t pid;
#endif
	uint32_t TS;
	struct current_thread *next;
};

struct threads {
	char name[17];
	uint32_t base_addr;	/*  address to read magic */
	uint32_t state;		/*  magic value : filled only at creation */
	uint32_t pid;		/* linux pid : id for identifying a thread */
	uint32_t oncpu;		/* content cpu number in current thread */
	uint32_t asid;		/*  filled only at creation  */
	int64_t threadid;
	int status;		/* dead = 1 alive = 2 current = 3 alive and current */
	/*  value that should not change during the live of a thread ? */
	uint32_t thread_info_addr;	/*  contain latest thread_info_addr computed */
	/*  retrieve from thread_info */
	struct cpu_context *context;
	struct threads *next;
};

struct cpu_context {
	uint32_t R4;
	uint32_t R5;
	uint32_t R6;
	uint32_t R7;
	uint32_t R8;
	uint32_t R9;
	uint32_t IP;
	uint32_t FP;
	uint32_t SP;
	uint32_t PC;
	uint32_t preempt_count;
};
static struct cpu_context *cpu_context_read(struct target *target, uint32_t base_addr,
				     uint32_t *info_addr);
static int insert_into_threadlist(struct target *target, struct threads *t);

static int linux_os_create(struct target *target);

static int linux_os_dummy_update(struct rtos *rtos)
{
	/*  update is done only when thread request come
	 *  too many thread to do it on each stop */
	return 0;
}

static int linux_compute_virt2phys(struct target *target, target_addr_t address)
{
	struct linux_os *linux_os = (struct linux_os *)
		target->rtos->rtos_specific_params;
	target_addr_t pa = 0;
	int retval = target->type->virt2phys(target, address, &pa);
	if (retval != ERROR_OK) {
		LOG_ERROR("Cannot compute linux virt2phys translation");
		/*  fixes default address  */
		linux_os->phys_base = 0;
		return ERROR_FAIL;
	}

	linux_os->init_task_addr = address;
	address = address & linux_os->phys_mask;
	linux_os->phys_base = pa - address;
	return ERROR_OK;
}

static int linux_read_memory(struct target *target,
	uint32_t address, uint32_t size, uint32_t count,
	uint8_t *buffer)
{
#ifdef PHYS
	struct linux_os *linux_os = (struct linux_os *)
		target->rtos->rtos_specific_params;
	uint32_t pa = (address & linux_os->phys_mask) + linux_os->phys_base;
#endif
	if (address < 0xc000000) {
		LOG_ERROR("linux awareness : address in user space");
		return ERROR_FAIL;
	}
#ifdef PHYS
	target_read_phys_memory(target, pa, size, count, buffer);
#endif
	target_read_memory(target, address, size, count, buffer);
	return ERROR_OK;
}

static int fill_buffer(struct target *target, uint32_t addr, uint8_t *buffer)
{

	if ((addr & 0xfffffffc) != addr)
		LOG_INFO("unaligned address %" PRIx32 "!!", addr);

	int retval = linux_read_memory(target, addr, 4, 1, buffer);
	return retval;

}

static uint32_t get_buffer(struct target *target, const uint8_t *buffer)
{
	uint32_t value = 0;
	const uint8_t *value_ptr = buffer;
	value = target_buffer_get_u32(target, value_ptr);
	return value;
}

static int linux_os_thread_reg_list(struct rtos *rtos,
	int64_t thread_id, struct rtos_reg **reg_list, int *num_regs)
{
	struct target *target = rtos->target;
	struct linux_os *linux_os = (struct linux_os *)
		target->rtos->rtos_specific_params;
	struct current_thread *tmp = linux_os->current_threads;
	struct current_thread *next;
	int found = 0;
	int retval;
	/*  check if a current thread is requested  */
	next = tmp;

	do {
		if (next->threadid == thread_id)
			found = 1;
		else
			next = next->next;
	} while ((found == 0) && (next != tmp) && (next));

	if (found == 0) {
		LOG_ERROR("could not find thread: %" PRIx64, thread_id);
		return ERROR_FAIL;
	}

	/*  search target to perform the access  */
	struct reg **gdb_reg_list;
	struct target_list *head;
	found = 0;
	foreach_smp_target(head, target->smp_targets) {
		if (head->target->coreid == next->core_id) {
			target = head->target;
			found = 1;
			break;
		}
	}

	if (found == 0) {
		LOG_ERROR
		(
			"current thread %" PRIx64 ": no target to perform access of core id %" PRIx32,
			thread_id,
			next->core_id);
		return ERROR_FAIL;
	}

	/*LOG_INFO("thread %lx current on core %x",thread_id, target->coreid);*/
	retval = target_get_gdb_reg_list(target, &gdb_reg_list, num_regs, REG_CLASS_GENERAL);
	if (retval != ERROR_OK)
		return retval;

	*reg_list = calloc(*num_regs, sizeof(struct rtos_reg));

	for (int i = 0; i < *num_regs; ++i) {
		if (!gdb_reg_list[i]->valid)