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// SPDX-License-Identifier: GPL-2.0-or-later
/***************************************************************************
* Copyright (C) 2011 by Broadcom Corporation *
* Evan Hunter - ehunter@broadcom.com *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "rtos.h"
#include "target/armv7m.h"
#include "rtos_standard_stackings.h"
static const struct stack_register_offset rtos_standard_cortex_m3_stack_offsets[ARMV7M_NUM_CORE_REGS] = {
{ ARMV7M_R0, 0x20, 32 }, /* r0 */
{ ARMV7M_R1, 0x24, 32 }, /* r1 */
{ ARMV7M_R2, 0x28, 32 }, /* r2 */
{ ARMV7M_R3, 0x2c, 32 }, /* r3 */
{ ARMV7M_R4, 0x00, 32 }, /* r4 */
{ ARMV7M_R5, 0x04, 32 }, /* r5 */
{ ARMV7M_R6, 0x08, 32 }, /* r6 */
{ ARMV7M_R7, 0x0c, 32 }, /* r7 */
{ ARMV7M_R8, 0x10, 32 }, /* r8 */
{ ARMV7M_R9, 0x14, 32 }, /* r9 */
{ ARMV7M_R10, 0x18, 32 }, /* r10 */
{ ARMV7M_R11, 0x1c, 32 }, /* r11 */
{ ARMV7M_R12, 0x30, 32 }, /* r12 */
{ ARMV7M_R13, -2, 32 }, /* sp */
{ ARMV7M_R14, 0x34, 32 }, /* lr */
{ ARMV7M_PC, 0x38, 32 }, /* pc */
{ ARMV7M_XPSR, 0x3c, 32 }, /* xPSR */
};
static const struct stack_register_offset rtos_standard_cortex_m4f_stack_offsets[] = {
{ ARMV7M_R0, 0x24, 32 }, /* r0 */
{ ARMV7M_R1, 0x28, 32 }, /* r1 */
{ ARMV7M_R2, 0x2c, 32 }, /* r2 */
{ ARMV7M_R3, 0x30, 32 }, /* r3 */
{ ARMV7M_R4, 0x00, 32 }, /* r4 */
{ ARMV7M_R5, 0x04, 32 }, /* r5 */
{ ARMV7M_R6, 0x08, 32 }, /* r6 */
{ ARMV7M_R7, 0x0c, 32 }, /* r7 */
{ ARMV7M_R8, 0x10, 32 }, /* r8 */
{ ARMV7M_R9, 0x14, 32 }, /* r9 */
{ ARMV7M_R10, 0x18, 32 }, /* r10 */
{ ARMV7M_R11, 0x1c, 32 }, /* r11 */
{ ARMV7M_R12, 0x34, 32 }, /* r12 */
{ ARMV7M_R13, -2, 32 }, /* sp */
{ ARMV7M_R14, 0x38, 32 }, /* lr */
{ ARMV7M_PC, 0x3c, 32 }, /* pc */
{ ARMV7M_XPSR, 0x40, 32 }, /* xPSR */
};
static const struct stack_register_offset rtos_standard_cortex_m4f_fpu_stack_offsets[] = {
{ ARMV7M_R0, 0x64, 32 }, /* r0 */
{ ARMV7M_R1, 0x68, 32 }, /* r1 */
{ ARMV7M_R2, 0x6c, 32 }, /* r2 */
{ ARMV7M_R3, 0x70, 32 }, /* r3 */
{ ARMV7M_R4, 0x00, 32 }, /* r4 */
{ ARMV7M_R5, 0x04, 32 }, /* r5 */
{ ARMV7M_R6, 0x08, 32 }, /* r6 */
{ ARMV7M_R7, 0x0c, 32 }, /* r7 */
{ ARMV7M_R8, 0x10, 32 }, /* r8 */
{ ARMV7M_R9, 0x14, 32 }, /* r9 */
{ ARMV7M_R10, 0x18, 32 }, /* r10 */
{ ARMV7M_R11, 0x1c, 32 }, /* r11 */
{ ARMV7M_R12, 0x74, 32 }, /* r12 */
{ ARMV7M_R13, -2, 32 }, /* sp */
{ ARMV7M_R14, 0x78, 32 }, /* lr */
{ ARMV7M_PC, 0x7c, 32 }, /* pc */
{ ARMV7M_XPSR, 0x80, 32 }, /* xPSR */
};
static const struct stack_register_offset rtos_standard_cortex_r4_stack_offsets[] = {
{ 0, 0x08, 32 }, /* r0 (a1) */
{ 1, 0x0c, 32 }, /* r1 (a2) */
{ 2, 0x10, 32 }, /* r2 (a3) */
{ 3, 0x14, 32 }, /* r3 (a4) */
{ 4, 0x18, 32 }, /* r4 (v1) */
{ 5, 0x1c, 32 }, /* r5 (v2) */
{ 6, 0x20, 32 }, /* r6 (v3) */
{ 7, 0x24, 32 }, /* r7 (v4) */
{ 8, 0x28, 32 }, /* r8 (a1) */
{ 10, 0x2c, 32 }, /* r9 (sb) */
{ 11, 0x30, 32 }, /* r10 (sl) */
{ 12, 0x34, 32 }, /* r11 (fp) */
{ 13, 0x38, 32 }, /* r12 (ip) */
{ 14, -2, 32 }, /* sp */
{ 15, 0x3c, 32 }, /* lr */
{ 16, 0x40, 32 }, /* pc */
{ 17, -1, 96 }, /* FPA1 */
{ 18, -1, 96 }, /* FPA2 */
{ 19, -1, 96 }, /* FPA3 */
{ 20, -1, 96 }, /* FPA4 */
{ 21, -1, 96 }, /* FPA5 */
{ 22, -1, 96 }, /* FPA6 */
{ 23, -1, 96 }, /* FPA7 */
{ 24, -1, 96 }, /* FPA8 */
{ 25, -1, 32 }, /* FPS */
{ 26, 0x04, 32 }, /* CSPR */
};
static target_addr_t rtos_generic_stack_align(struct target *target,
const uint8_t *stack_data, const struct rtos_register_stacking *stacking,
target_addr_t stack_ptr, int align)
{
target_addr_t new_stack_ptr;
target_addr_t aligned_stack_ptr;
new_stack_ptr = stack_ptr - stacking->stack_growth_direction *
stacking->stack_registers_size;
aligned_stack_ptr = new_stack_ptr & ~((target_addr_t)align - 1);
if (aligned_stack_ptr != new_stack_ptr &&
stacking->stack_growth_direction == -1) {
/* If we have a downward growing stack, the simple alignment code
* above results in a wrong result (since it rounds down to nearest
* alignment). We want to round up so add an extra align.
*/
aligned_stack_ptr += (target_addr_t)align;
}
return aligned_stack_ptr;
}
target_addr_t rtos_generic_stack_align8(struct target *target,
const uint8_t *stack_data, const struct rtos_register_stacking *stacking,
target_addr_t stack_ptr)
{
return rtos_generic_stack_align(target, stack_data,
stacking, stack_ptr, 8);
}
/* The Cortex-M3 will indicate that an alignment adjustment
* has been done on the stack by setting bit 9 of the stacked xPSR
* register. In this case, we can just add an extra 4 bytes to get
* to the program stack. Note that some places in the ARM documentation
* make this a little unclear but the padding takes place before the
* normal exception stacking - so xPSR is always available at a fixed
* location.
*
* Relevant documentation:
* Cortex-M series processors -> Cortex-M3 -> Revision: xxx ->
* Cortex-M3 Devices Generic User Guide -> The Cortex-M3 Processor ->
* Exception Model -> Exception entry and return -> Exception entry
* Cortex-M series processors -> Cortex-M3 -> Revision: xxx ->
* Cortex-M3 Devices Generic User Guide -> Cortex-M3 Peripherals ->
* System control block -> Configuration and Control Register (STKALIGN)
*
* This is just a helper function for use in the calculate_process_stack
* function for a given architecture/rtos.
*/
target_addr_t rtos_cortex_m_stack_align(struct target *target,
const uint8_t *stack_data, const struct rtos_register_stacking *stacking,
target_addr_t stack_ptr, size_t xpsr_offset)
{
const uint32_t ALIGN_NEEDED = (1 << 9);
uint32_t xpsr;
target_addr_t new_stack_ptr;
new_stack_ptr = stack_ptr - stacking->stack_growth_direction *
stacking->stack_registers_size;
xpsr = target_buffer_get_u32(target, &stack_data[xpsr_offset]);
if ((xpsr & ALIGN_NEEDED) != 0) {
LOG_DEBUG("XPSR(0x%08" PRIx32 ") indicated stack alignment was necessary\r\n",
xpsr);
new_stack_ptr -= (stacking->stack_growth_direction * 4);
}
return new_stack_ptr;
}
static target_addr_t rtos_standard_cortex_m3_stack_align(struct target *target,
const uint8_t *stack_data, const struct rtos_register_stacking *stacking,
target_addr_t stack_ptr)
{
const int XPSR_OFFSET = 0x3c;
return rtos_cortex_m_stack_align(target, stack_data, stacking,
stack_ptr, XPSR_OFFSET);
}
static target_addr_t rtos_standard_cortex_m4f_stack_align(struct target *target,
const uint8_t *stack_data, const struct rtos_register_stacking *stacking,
target_addr_t stack_ptr)
{
const int XPSR_OFFSET = 0x40;
return rtos_cortex_m_stack_align(target, stack_data, stacking,
stack_ptr, XPSR_OFFSET);
}
static target_addr_t rtos_standard_cortex_m4f_fpu_stack_align(struct target *target,
const uint8_t *stack_data, const struct rtos_register_stacking *stacking,
target_addr_t stack_ptr)
{
const int XPSR_OFFSET = 0x80;
return rtos_cortex_m_stack_align(target, stack_data, stacking,
stack_ptr, XPSR_OFFSET);
}
const struct rtos_register_stacking rtos_standard_cortex_m3_stacking = {
.stack_registers_size = 0x40,
.stack_growth_direction = -1,
.num_output_registers = ARMV7M_NUM_CORE_REGS,
.calculate_process_stack = rtos_standard_cortex_m3_stack_align,
.register_offsets = rtos_standard_cortex_m3_stack_offsets
};
const struct rtos_register_stacking rtos_standard_cortex_m4f_stacking = {
.stack_registers_size = 0x44,
.stack_growth_direction = -1,
.num_output_registers = ARMV7M_NUM_CORE_REGS,
.calculate_process_stack = rtos_standard_cortex_m4f_stack_align,
.register_offsets = rtos_standard_cortex_m4f_stack_offsets
};
const struct rtos_register_stacking rtos_standard_cortex_m4f_fpu_stacking = {
.stack_registers_size = 0xcc,
.stack_growth_direction = -1,
.num_output_registers = ARMV7M_NUM_CORE_REGS,
.calculate_process_stack = rtos_standard_cortex_m4f_fpu_stack_align,
.register_offsets = rtos_standard_cortex_m4f_fpu_stack_offsets
};
const struct rtos_register_stacking rtos_standard_cortex_r4_stacking = {
.stack_registers_size = 0x48,
.stack_growth_direction = -1,
.num_output_registers = 26,
.calculate_process_stack = rtos_generic_stack_align8,
.register_offsets = rtos_standard_cortex_r4_stack_offsets
};
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