X-Git-Url: https://review.openocd.org/gitweb?p=openocd.git;a=blobdiff_plain;f=src%2Frtos%2Frtos_standard_stackings.c;h=931cfc7eddddb0af257f045b1d549ca1890bf0e2;hp=fed393b958991e7d672561e246f076b6a5f12b11;hb=4f2c3e6c4f82fbbf9c5d7e8a234c949d11ef5ae7;hpb=9413a7a814755f3fab92f460bfbdd518f24ffaf5 diff --git a/src/rtos/rtos_standard_stackings.c b/src/rtos/rtos_standard_stackings.c index fed393b958..931cfc7edd 100644 --- a/src/rtos/rtos_standard_stackings.c +++ b/src/rtos/rtos_standard_stackings.c @@ -13,9 +13,7 @@ * 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, write to the * - * Free Software Foundation, Inc., * - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * + * along with this program. If not, see . * ***************************************************************************/ #ifdef HAVE_CONFIG_H @@ -45,6 +43,47 @@ static const struct stack_register_offset rtos_standard_Cortex_M3_stack_offsets[ { 0x3c, 32 }, /* xPSR */ }; +static const struct stack_register_offset rtos_standard_Cortex_M4F_stack_offsets[] = { + { 0x24, 32 }, /* r0 */ + { 0x28, 32 }, /* r1 */ + { 0x2c, 32 }, /* r2 */ + { 0x30, 32 }, /* r3 */ + { 0x00, 32 }, /* r4 */ + { 0x04, 32 }, /* r5 */ + { 0x08, 32 }, /* r6 */ + { 0x0c, 32 }, /* r7 */ + { 0x10, 32 }, /* r8 */ + { 0x14, 32 }, /* r9 */ + { 0x18, 32 }, /* r10 */ + { 0x1c, 32 }, /* r11 */ + { 0x34, 32 }, /* r12 */ + { -2, 32 }, /* sp */ + { 0x38, 32 }, /* lr */ + { 0x3c, 32 }, /* pc */ + { 0x40, 32 }, /* xPSR */ +}; + +static const struct stack_register_offset rtos_standard_Cortex_M4F_FPU_stack_offsets[] = { + { 0x64, 32 }, /* r0 */ + { 0x68, 32 }, /* r1 */ + { 0x6c, 32 }, /* r2 */ + { 0x70, 32 }, /* r3 */ + { 0x00, 32 }, /* r4 */ + { 0x04, 32 }, /* r5 */ + { 0x08, 32 }, /* r6 */ + { 0x0c, 32 }, /* r7 */ + { 0x10, 32 }, /* r8 */ + { 0x14, 32 }, /* r9 */ + { 0x18, 32 }, /* r10 */ + { 0x1c, 32 }, /* r11 */ + { 0x74, 32 }, /* r12 */ + { -2, 32 }, /* sp */ + { 0x78, 32 }, /* lr */ + { 0x7c, 32 }, /* pc */ + { 0x80, 32 }, /* xPSR */ +}; + + static const struct stack_register_offset rtos_standard_Cortex_R4_stack_offsets[] = { { 0x08, 32 }, /* r0 (a1) */ { 0x0c, 32 }, /* r1 (a2) */ @@ -141,14 +180,98 @@ int64_t rtos_generic_stack_align8(struct target *target, 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. + */ +int64_t rtos_Cortex_M_stack_align(struct target *target, + const uint8_t *stack_data, const struct rtos_register_stacking *stacking, + int64_t stack_ptr, size_t xpsr_offset) +{ + const uint32_t ALIGN_NEEDED = (1 << 9); + uint32_t xpsr; + int64_t new_stack_ptr; + + new_stack_ptr = stack_ptr - stacking->stack_growth_direction * + stacking->stack_registers_size; + xpsr = (target->endianness == TARGET_LITTLE_ENDIAN) ? + le_to_h_u32(&stack_data[xpsr_offset]) : + be_to_h_u32(&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 int64_t rtos_standard_Cortex_M3_stack_align(struct target *target, + const uint8_t *stack_data, const struct rtos_register_stacking *stacking, + int64_t stack_ptr) +{ + const int XPSR_OFFSET = 0x3c; + return rtos_Cortex_M_stack_align(target, stack_data, stacking, + stack_ptr, XPSR_OFFSET); +} + +static int64_t rtos_standard_Cortex_M4F_stack_align(struct target *target, + const uint8_t *stack_data, const struct rtos_register_stacking *stacking, + int64_t stack_ptr) +{ + const int XPSR_OFFSET = 0x40; + return rtos_Cortex_M_stack_align(target, stack_data, stacking, + stack_ptr, XPSR_OFFSET); +} + +static int64_t rtos_standard_Cortex_M4F_FPU_stack_align(struct target *target, + const uint8_t *stack_data, const struct rtos_register_stacking *stacking, + int64_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 = { 0x40, /* stack_registers_size */ -1, /* stack_growth_direction */ ARMV7M_NUM_CORE_REGS, /* num_output_registers */ - rtos_generic_stack_align8, /* stack_alignment */ + rtos_standard_Cortex_M3_stack_align, /* stack_alignment */ rtos_standard_Cortex_M3_stack_offsets /* register_offsets */ }; +const struct rtos_register_stacking rtos_standard_Cortex_M4F_stacking = { + 0x44, /* stack_registers_size 4 more for LR*/ + -1, /* stack_growth_direction */ + ARMV7M_NUM_CORE_REGS, /* num_output_registers */ + rtos_standard_Cortex_M4F_stack_align, /* stack_alignment */ + rtos_standard_Cortex_M4F_stack_offsets /* register_offsets */ +}; + +const struct rtos_register_stacking rtos_standard_Cortex_M4F_FPU_stacking = { + 0xcc, /* stack_registers_size 4 more for LR + 48 more for FPU S0-S15 register*/ + -1, /* stack_growth_direction */ + ARMV7M_NUM_CORE_REGS, /* num_output_registers */ + rtos_standard_Cortex_M4F_FPU_stack_align, /* stack_alignment */ + rtos_standard_Cortex_M4F_FPU_stack_offsets /* register_offsets */ +}; + const struct rtos_register_stacking rtos_standard_Cortex_R4_stacking = { 0x48, /* stack_registers_size */ -1, /* stack_growth_direction */