stm32f4 __wfi
Christian Mauderer
christian.mauderer at embedded-brains.de
Wed Apr 24 08:36:14 UTC 2019
For some reason your grep hasn't found the _CPU_Thread_Idle_body. It's
possible that the stm32f4 uses some other function for that also I don't
know why.
For example for the xilinx_zynq_a9_qemu BSP the disassembled idle body
looks like follows:
void *_CPU_Thread_Idle_body( uintptr_t ignored )
{
11d70: b480 push {r7}
11d72: b083 sub sp, #12
11d74: af00 add r7, sp, #0
11d76: 6078 str r0, [r7, #4]
while ( true ) {
#ifdef ARM_MULTILIB_HAS_WFI
__asm__ volatile ("wfi");
11d78: bf30 wfi
11d7a: e7fd b.n 11d78 <_CPU_Thread_Idle_body+0x8>
Am 24.04.19 um 10:25 schrieb Jython:
> arm-rtems4.11-objdump -dS hello.exe | grep idle --color=auto -n -B 5 -A 12
>
> there is no idle function which calls wfi command
> // log
> 508-
> 509-
> 510-
> 511- }
> 512-
> 513: if((*USART2_SR) & (1<<4)) // idle
> 514- 3aa: 4b13 ldr r3, [pc, #76] ; (3f8
> <USART2_handler+0x94>)
> 515- 3ac: 681b ldr r3, [r3, #0]
> 516- 3ae: 681b ldr r3, [r3, #0]
> 517- 3b0: f003 0310 and.w r3, r3, #16
> 518- 3b4: 2b00 cmp r3, #0
> 519- 3b6: d00a beq.n 3ce <USART2_handler+0x6a>
> 520- {
> 521: //printk("idle ");
> 522-
> 523- temp = (*USART2_SR);
> 524- 3b8: 4b0f ldr r3, [pc, #60] ; (3f8
> <USART2_handler+0x94>)
> 525- 3ba: 681b ldr r3, [r3, #0]
> 526- 3bc: 681b ldr r3, [r3, #0]
> 527- 3be: 60fb str r3, [r7, #12]
> 528- temp = (*USART2_DR);
> 529- 3c0: 4b0f ldr r3, [pc, #60] ; (400
> <USART2_handler+0x9c>)
> 530- 3c2: 681b ldr r3, [r3, #0]
> 531- 3c4: 681b ldr r3, [r3, #0]
> 532- 3c6: 60fb str r3, [r7, #12]
> 533- //temp = temp;
> --
> 627-
> 628-
> 629-
> 630- }
> 631-
> 632: if((*USART3_SR) & (1<<4)) // idle
> 633- 44c: 4b12 ldr r3, [pc, #72] ; (498
> <USART3_handler+0x8c>)
> 634- 44e: 681b ldr r3, [r3, #0]
> 635- 450: 681b ldr r3, [r3, #0]
> 636- 452: f003 0310 and.w r3, r3, #16
> 637- 456: 2b00 cmp r3, #0
> 638- 458: d00a beq.n 470 <USART3_handler+0x64>
> 639- {
> 640: //printk("idle ");
> 641-
> 642- temp = (*USART3_SR);
> 643- 45a: 4b0f ldr r3, [pc, #60] ; (498
> <USART3_handler+0x8c>)
> 644- 45c: 681b ldr r3, [r3, #0]
> 645- 45e: 681b ldr r3, [r3, #0]
> 646- 460: 60fb str r3, [r7, #12]
> 647- temp = (*USART3_DR);
> 648- 462: 4b0f ldr r3, [pc, #60] ; (4a0
> <USART3_handler+0x94>)
> 649- 464: 681b ldr r3, [r3, #0]
> 650- 466: 681b ldr r3, [r3, #0]
> 651- 468: 60fb str r3, [r7, #12]
> 652-
> --
> 26329-
> 26330- if (newTail == tty->rawOutBuf.Head) {
> 26331- /*
> 26332- * Buffer has become empty
> 26333- */
> 26334: tty->rawOutBufState = rob_idle;
> 26335- 69a0: f880 5094 strb.w r5, [r0, #148] ; 0x94
> 26336- (*tty->handler.write) (ctx, NULL, 0);
> 26337- 69a4: f8d4 30c4 ldr.w r3, [r4, #196] ; 0xc4
> 26338- 69a8: 4670 mov r0, lr
> 26339- 69aa: 4629 mov r1, r5
> 26340- 69ac: 462a mov r2, r5
> 26341- 69ae: 4798 blx r3
> 26342- nToSend = 0;
> 26343-
> 26344- /*
> 26345- * check to see if snd wakeup callback was set
> 26346- */
> --
> 26443- 6a12: 2600 movs r6, #0
> 26444- 6a14: e7ac b.n 6970
> <rtems_termios_refill_transmitter+0x7c>
> 26445- /*
> 26446- * Buffer has become empty
> 26447- */
> 26448: tty->rawOutBufState = rob_idle;
> 26449- (*tty->handler.write) (ctx, NULL, 0);
> 26450- nToSend = 0;
> 26451- 6a16: 461d mov r5, r3
> 26452- 6a18: e7aa b.n 6970
> <rtems_termios_refill_transmitter+0x7c>
> 26453- 6a1a: bf00 nop
> 26454-
> 26455-00006a1c <rtems_termios_txdaemon>:
> 26456-
> 26457-/*
> 26458- * this task actually processes any transmit events
> 26459- */
> 26460-static rtems_task rtems_termios_txdaemon(rtems_task_argument argument)
> --
> 27083- RTEMS_NO_PRIORITY,
> 27084- &tty->rawOutBuf.Semaphore);
> 27085- if (sc != RTEMS_SUCCESSFUL)
> 27086- 6cc0: 2800 cmp r0, #0
> 27087- 6cc2: f040 80d6 bne.w 6e72
> <rtems_termios_open_tty+0x2de>
> 27088: tty->rawOutBufState = rob_idle;
> 27089-
> 27090- /*
> 27091- * Set callbacks
> 27092- */
> 27093- if (device_node != NULL) {
> 27094- 6cc6: 9b0e ldr r3, [sp, #56] ; 0x38
> 27095- RTEMS_SIMPLE_BINARY_SEMAPHORE | RTEMS_FIFO,
> 27096- RTEMS_NO_PRIORITY,
> 27097- &tty->rawOutBuf.Semaphore);
> 27098- if (sc != RTEMS_SUCCESSFUL)
> 27099- rtems_fatal_error_occurred (sc);
> 27100: tty->rawOutBufState = rob_idle;
> 27101- 6cc8: f884 0094 strb.w r0, [r4, #148] ; 0x94
> 27102-
> 27103- /*
> 27104- * Set callbacks
> 27105- */
> 27106- if (device_node != NULL) {
> 27107- 6ccc: 2b00 cmp r3, #0
> 27108- 6cce: f000 80e9 beq.w 6ea4
> <rtems_termios_open_tty+0x310>
> 27109- device_node->tty = tty;
> 27110- tty->handler = *device_node->handler;
> 27111- 6cd2: f104 0cb8 add.w ip, r4, #184 ; 0xb8
> 27112- 6cd6: 4666 mov r6, ip
> --
> 29226- /* disable interrupts */
> 29227- rtems_termios_device_lock_acquire (ctx, &lock_context);
> 29228- tty->flow_ctrl &= ~FL_OSTOP;
> 29229- 7442: f8d4 30d8 ldr.w r3, [r4, #216] ; 0xd8
> 29230- /* check for chars in output buffer (or rob_state?) */
> 29231: if (tty->rawOutBufState != rob_idle) {
> 29232- 7446: f894 2094 ldrb.w r2, [r4, #148] ; 0x94
> 29233-
> 29234- /* has output been stopped due to received XOFF? */
> 29235- if (tty->flow_ctrl & FL_OSTOP) {
> 29236- /* disable interrupts */
> 29237- rtems_termios_device_lock_acquire (ctx, &lock_context);
> 29238- tty->flow_ctrl &= ~FL_OSTOP;
> 29239- 744a: f023 0320 bic.w r3, r3, #32
> 29240- 744e: f8c4 30d8 str.w r3, [r4, #216] ; 0xd8
> 29241- /* check for chars in output buffer (or rob_state?) */
> 29242: if (tty->rawOutBufState != rob_idle) {
> 29243- 7452: 2a00 cmp r2, #0
> 29244- 7454: f040 80cf bne.w 75f6 <rtems_termios_ioctl+0x306>
> 29245- ARM_SWITCH_BACK
> 29246- : ARM_SWITCH_OUTPUT
> 29247- : [level] "r" (level)
> 29248- );
> 29249-#elif defined(ARM_MULTILIB_ARCH_V7M)
> 29250- __asm__ volatile (
> 29251- 7458: f387 8811 msr BASEPRI, r7
> 29252- /* reenable interrupts */
> 29253- rtems_termios_device_lock_release (ctx, &lock_context);
> 29254- }
> --
> 29492-
> 29493- rtems_termios_device_lock_acquire (ctx, &lock_context);
> 29494- tty->rawOutBuf.Tail = 0;
> 29495- 7572: f8c4 0084 str.w r0, [r4, #132] ; 0x84
> 29496- tty->rawOutBuf.Head = 0;
> 29497: tty->rawOutBufState = rob_idle;
> 29498- 7576: f884 0094 strb.w r0, [r4, #148] ; 0x94
> 29499- rtems_termios_device_context *ctx = tty->device_context;
> 29500- rtems_interrupt_lock_context lock_context;
> 29501-
> 29502- rtems_termios_device_lock_acquire (ctx, &lock_context);
> 29503- tty->rawOutBuf.Tail = 0;
> 29504- tty->rawOutBuf.Head = 0;
> 29505- 757a: f8c4 0080 str.w r0, [r4, #128] ; 0x80
> 29506- ARM_SWITCH_BACK
> 29507- : ARM_SWITCH_OUTPUT
> 29508- : [level] "r" (level)
> 29509- );
> --
> 29562-
> 29563- rtems_termios_device_lock_acquire (ctx, &lock_context);
> 29564- tty->rawOutBuf.Tail = 0;
> 29565- 75b0: f8c4 0084 str.w r0, [r4, #132] ; 0x84
> 29566- tty->rawOutBuf.Head = 0;
> 29567: tty->rawOutBufState = rob_idle;
> 29568- 75b4: f884 0094 strb.w r0, [r4, #148] ; 0x94
> 29569- rtems_termios_device_context *ctx = tty->device_context;
> 29570- rtems_interrupt_lock_context lock_context;
> 29571-
> 29572- rtems_termios_device_lock_acquire (ctx, &lock_context);
> 29573- tty->rawOutBuf.Tail = 0;
> 29574- tty->rawOutBuf.Head = 0;
> 29575- 75b8: f8c4 0080 str.w r0, [r4, #128] ; 0x80
> 29576- ARM_SWITCH_BACK
> 29577- : ARM_SWITCH_OUTPUT
> 29578- : [level] "r" (level)
> 29579- );
> --
> 29629- 75f0: 2301 movs r3, #1
> 29630- 75f2: 66e3 str r3, [r4, #108] ; 0x6c
> 29631- 75f4: e77e b.n 74f4 <rtems_termios_ioctl+0x204>
> 29632- tty->flow_ctrl &= ~FL_OSTOP;
> 29633- /* check for chars in output buffer (or rob_state?) */
> 29634: if (tty->rawOutBufState != rob_idle) {
> 29635- /* if chars available, call write function... */
> 29636- (*tty->handler.write)(
> 29637- ctx, &tty->rawOutBuf.theBuf[tty->rawOutBuf.Tail],1);
> 29638- 75f6: f8d4 2084 ldr.w r2, [r4, #132] ; 0x84
> 29639- rtems_termios_device_lock_acquire (ctx, &lock_context);
> 29640- tty->flow_ctrl &= ~FL_OSTOP;
> 29641- /* check for chars in output buffer (or rob_state?) */
> 29642: if (tty->rawOutBufState != rob_idle) {
> 29643- /* if chars available, call write function... */
> 29644- (*tty->handler.write)(
> 29645- 75fa: 6fe1 ldr r1, [r4, #124] ; 0x7c
> 29646- 75fc: f8d4 30c4 ldr.w r3, [r4, #196] ; 0xc4
> 29647- 7600: 4411 add r1, r2
> 29648- 7602: 4628 mov r0, r5
> 29649- 7604: 2201 movs r2, #1
> 29650- 7606: 4798 blx r3
> 29651- 7608: e726 b.n 7458 <rtems_termios_ioctl+0x168>
> 29652- 760a: bf00 nop
> 29653-
> 29654-0000760c <rtems_termios_puts>:
> --
> 29815- 76b2: bf24 itt cs
> 29816- 76b4: f8d4 2088 ldrcs.w r2, [r4, #136] ; 0x88
> 29817- 76b8: 1a9b subcs r3, r3, r2
> 29818- tty->rawOutBuf.Head = newHead;
> 29819-
> 29820: if (tty->rawOutBufState == rob_idle) {
> 29821- 76ba: f894 2094 ldrb.w r2, [r4, #148] ; 0x94
> 29822- memcpy(&tty->rawOutBuf.theBuf[tty->rawOutBuf.Head], buf, nToCopy);
> 29823-
> 29824- newHead = tty->rawOutBuf.Head + nToCopy;
> 29825- if (newHead >= tty->rawOutBuf.Size)
> 29826- newHead -= tty->rawOutBuf.Size;
> 29827- tty->rawOutBuf.Head = newHead;
> 29828- 76be: f8c4 3080 str.w r3, [r4, #128] ; 0x80
> 29829-
> 29830: if (tty->rawOutBufState == rob_idle) {
> 29831- 76c2: b192 cbz r2, 76ea <rtems_termios_puts+0xde>
> 29832- ARM_SWITCH_BACK
> 29833- : ARM_SWITCH_OUTPUT
> 29834- : [level] "r" (level)
> 29835- );
> 29836-#elif defined(ARM_MULTILIB_ARCH_V7M)
> 29837- __asm__ volatile (
> 29838- 76c4: f385 8811 msr BASEPRI, r5
> 29839- if (tty->handler.mode == TERMIOS_POLLED) {
> 29840- (*tty->handler.write)(ctx, buf, len);
> 29841- return;
> 29842- }
> --
> 29885- 76e8: e7d2 b.n 7690 <rtems_termios_puts+0x84>
> 29886- if (newHead >= tty->rawOutBuf.Size)
> 29887- newHead -= tty->rawOutBuf.Size;
> 29888- tty->rawOutBuf.Head = newHead;
> 29889-
> 29890: if (tty->rawOutBufState == rob_idle) {
> 29891- startXmit (tty, tty->rawOutBuf.Tail, false);
> 29892- 76ea: f8d4 1084 ldr.w r1, [r4, #132] ; 0x84
> 29893- 76ee: 4620 mov r0, r4
> 29894- 76f0: f7ff f8ca bl 6888 <startXmit>
> 29895- 76f4: e7e6 b.n 76c4 <rtems_termios_puts+0xb8>
> 29896- rtems_termios_device_context *ctx = tty->device_context;
> 29897- rtems_interrupt_lock_context lock_context;
> 29898- rtems_status_code sc;
> 29899-
> 29900- if (tty->handler.mode == TERMIOS_POLLED) {
> 29901- (*tty->handler.write)(ctx, buf, len);
> 29902- 76f6: f8d2 30c4 ldr.w r3, [r2, #196] ; 0xc4
> --
> 31283- while ((tty->rawInBuf.Head != tty->rawInBuf.Tail) &&
> 31284- 7be4: 428a cmp r2, r1
> 31285- 7be6: f04f 0501 mov.w r5, #1
> 31286- 7bea: d968 bls.n 7cbe <rtems_termios_read+0x1a6>
> 31287- == (FL_MDXON | FL_ISNTXOF))
> 31288: && ((tty->rawOutBufState == rob_idle)
> 31289- || (tty->flow_ctrl & FL_OSTOP))) {
> 31290- /* XON should be sent now... */
> 31291- (*tty->handler.write)(
> 31292- tty->device_context, (void
> *)&(tty->termios.c_cc[VSTART]), 1);
> 31293- 7bec: f104 0849 add.w r8, r4, #73 ; 0x49
> 31294- 7bf0: e012 b.n 7c18 <rtems_termios_read+0x100>
> 31295-
> 31296- rtems_termios_device_lock_release (ctx, &lock_context);
> 31297-
> 31298- /* continue processing new character */
> 31299- if (tty->termios.c_lflag & ICANON) {
> 31300- if (siproc (c, tty))
> --
> 31401- if (((tty->flow_ctrl & (FL_MDXON | FL_ISNTXOF))
> 31402- 7c56: f8d4 20d8 ldr.w r2, [r4, #216] ; 0xd8
> 31403- 7c5a: 4013 ands r3, r2
> 31404- 7c5c: 4553 cmp r3, sl
> 31405- 7c5e: d01e beq.n 7c9e <rtems_termios_read+0x186>
> 31406: && ((tty->rawOutBufState == rob_idle)
> 31407- || (tty->flow_ctrl & FL_OSTOP))) {
> 31408- /* XON should be sent now... */
> 31409- (*tty->handler.write)(
> 31410- tty->device_context, (void
> *)&(tty->termios.c_cc[VSTART]), 1);
> 31411- } else if (tty->flow_ctrl & FL_MDRTS) {
> 31412- 7c60: f8d4 30d8 ldr.w r3, [r4, #216] ; 0xd8
> 31413- 7c64: 05da lsls r2, r3, #23
> 31414- 7c66: d50b bpl.n 7c80 <rtems_termios_read+0x168>
> 31415- tty->flow_ctrl &= ~FL_IRTSOFF;
> 31416- 7c68: f8d4 30d8 ldr.w r3, [r4, #216] ; 0xd8
> 31417- /* activate RTS line */
> 31418- if (tty->flow.start_remote_tx != NULL) {
> --
> 31477- < tty->lowwater) {
> 31478- tty->flow_ctrl &= ~FL_IREQXOF;
> 31479- /* if tx stopped and XON should be sent... */
> 31480- if (((tty->flow_ctrl & (FL_MDXON | FL_ISNTXOF))
> 31481- == (FL_MDXON | FL_ISNTXOF))
> 31482: && ((tty->rawOutBufState == rob_idle)
> 31483- 7c9e: f894 3094 ldrb.w r3, [r4, #148] ; 0x94
> 31484- 7ca2: b11b cbz r3, 7cac <rtems_termios_read+0x194>
> 31485- || (tty->flow_ctrl & FL_OSTOP))) {
> 31486- 7ca4: f8d4 30d8 ldr.w r3, [r4, #216] ; 0xd8
> 31487- 7ca8: 0699 lsls r1, r3, #26
> 31488- 7caa: d5d9 bpl.n 7c60 <rtems_termios_read+0x148>
> 31489- /* XON should be sent now... */
> 31490- (*tty->handler.write)(
> 31491- 7cac: f8d4 30c4 ldr.w r3, [r4, #196] ; 0xc4
> 31492- 7cb0: f8d4 010c ldr.w r0, [r4, #268] ; 0x10c
> 31493- 7cb4: 4641 mov r1, r8
> 31494- 7cb6: 2201 movs r2, #1
> --
> 32101- /* disable interrupts */
> 32102- rtems_termios_device_lock_acquire (ctx, &lock_context);
> 32103- tty->flow_ctrl &= ~FL_OSTOP;
> 32104- 7f34: f8d4 30d8 ldr.w r3, [r4, #216] ; 0xd8
> 32105- /* check for chars in output buffer (or rob_state?) */
> 32106: if (tty->rawOutBufState != rob_idle) {
> 32107- 7f38: f894 2094 ldrb.w r2, [r4, #148] ; 0x94
> 32108- if (flow_rcv) {
> 32109- /* restart output according to FL_ORCVXOF flag */
> 32110- if ((tty->flow_ctrl & (FL_ORCVXOF | FL_OSTOP)) == FL_OSTOP) {
> 32111- /* disable interrupts */
> 32112- rtems_termios_device_lock_acquire (ctx, &lock_context);
> 32113- tty->flow_ctrl &= ~FL_OSTOP;
> 32114- 7f3c: f023 0320 bic.w r3, r3, #32
> 32115- 7f40: f8c4 30d8 str.w r3, [r4, #216] ; 0xd8
> 32116- /* check for chars in output buffer (or rob_state?) */
> 32117: if (tty->rawOutBufState != rob_idle) {
> 32118- 7f44: b94a cbnz r2, 7f5a
> <rtems_termios_enqueue_raw_characters+0x1ca>
> 32119- ARM_SWITCH_BACK
> 32120- : ARM_SWITCH_OUTPUT
> 32121- : [level] "r" (level)
> 32122- );
> 32123-#elif defined(ARM_MULTILIB_ARCH_V7M)
> 32124- __asm__ volatile (
> 32125- 7f46: f386 8811 msr BASEPRI, r6
> 32126- 7f4a: 2601 movs r6, #1
> 32127- 7f4c: e760 b.n 7e10
> <rtems_termios_enqueue_raw_characters+0x80>
> 32128- if (( !tty->tty_rcvwakeup ) && ( tty->tty_rcv.sw_pfn !=
> NULL )) {
> 32129- (*tty->tty_rcv.sw_pfn)(&tty->termios, tty->tty_rcv.sw_arg);
> --
> 32136- 7f52: 9300 str r3, [sp, #0]
> 32137- 7f54: f38a 8811 msr BASEPRI, sl
> 32138- 7f58: e75a b.n 7e10
> <rtems_termios_enqueue_raw_characters+0x80>
> 32139- tty->flow_ctrl &= ~FL_OSTOP;
> 32140- /* check for chars in output buffer (or rob_state?) */
> 32141: if (tty->rawOutBufState != rob_idle) {
> 32142- /* if chars available, call write function... */
> 32143- (*tty->handler.write)(
> 32144- ctx, &tty->rawOutBuf.theBuf[tty->rawOutBuf.Tail], 1);
> 32145- 7f5a: f8d4 2084 ldr.w r2, [r4, #132] ; 0x84
> 32146- rtems_termios_device_lock_acquire (ctx, &lock_context);
> 32147- tty->flow_ctrl &= ~FL_OSTOP;
> 32148- /* check for chars in output buffer (or rob_state?) */
> 32149: if (tty->rawOutBufState != rob_idle) {
> 32150- /* if chars available, call write function... */
> 32151- (*tty->handler.write)(
> 32152- 7f5e: 6fe1 ldr r1, [r4, #124] ; 0x7c
> 32153- 7f60: f8d4 30c4 ldr.w r3, [r4, #196] ; 0xc4
> 32154- 7f64: 4411 add r1, r2
> 32155- 7f66: 4658 mov r0, fp
> 32156- 7f68: 2201 movs r2, #1
> 32157- 7f6a: f8cd c004 str.w ip, [sp, #4]
> 32158- 7f6e: 4798 blx r3
> 32159- 7f70: f8dd c004 ldr.w ip, [sp, #4]
> 32160- 7f74: e7e7 b.n 7f46
> <rtems_termios_enqueue_raw_characters+0x1b6>
> 32161- + tty->rawInBuf.Size) % tty->rawInBuf.Size) >
> tty->highwater)) {
> --
> 32167- 7f76: 0692 lsls r2, r2, #26
> 32168- 7f78: d403 bmi.n 7f82
> <rtems_termios_enqueue_raw_characters+0x1f2>
> 32169- 7f7a: f894 2094 ldrb.w r2, [r4, #148] ; 0x94
> 32170- 7f7e: 2a00 cmp r2, #0
> 32171- 7f80: d18c bne.n 7e9c
> <rtems_termios_enqueue_raw_characters+0x10c>
> 32172: (tty->rawOutBufState == rob_idle)) {
> 32173- /* if tx is stopped due to XOFF or out of data */
> 32174- /* call write function here */
> 32175- tty->flow_ctrl |= FL_ISNTXOF;
> 32176- 7f82: f8d4 20d8 ldr.w r2, [r4, #216] ; 0xd8
> 32177- 7f86: 9301 str r3, [sp, #4]
> 32178- 7f88: f042 0202 orr.w r2, r2, #2
> 32179- 7f8c: f8c4 20d8 str.w r2, [r4, #216] ; 0xd8
> 32180- (*tty->handler.write)(ctx,
> 32181- 7f90: f8d4 30c4 ldr.w r3, [r4, #196] ; 0xc4
> 32182- 7f94: 4658 mov r0, fp
> 32183- 7f96: f104 014a add.w r1, r4, #74 ; 0x4a
> 32184- 7f9a: 2201 movs r2, #1
> --
> 38521- 9512: f000 f825 bl 9560
> <_Extension_Manager_initialization>
> 38522-
> 38523- _POSIX_API_Initialize();
> 38524- 9516: f000 f863 bl 95e0 <_POSIX_API_Initialize>
> 38525- 951a: 7025 strb r5, [r4, #0]
> 38526: _Thread_Create_idle();
> 38527-
> 38528- /*
> 38529- * Scheduling can properly occur now as long as we avoid
> dispatching.
> 38530- */
> 38531-}
> 38532- 951c: e8bd 4038 ldmia.w sp!, {r3, r4, r5, lr}
> 38533- * _Thread_Executing and _Thread_Heir are not set.
> 38534- *
> 38535- * At this point all API extensions are in place. After the
> call to
> 38536: * _Thread_Create_idle() _Thread_Executing and _Thread_Heir
> will be set.
> 38537- */
> 38538: _Thread_Create_idle();
> 38539: 9520: f002 ba3a b.w b998 <_Thread_Create_idle>
> 38540- 9524: 20004618 .word 0x20004618
> 38541- 9528: 20004640 .word 0x20004640
> 38542- 952c: 200041d0 .word 0x200041d0
> 38543- 9530: 200041e0 .word 0x200041e0
> 38544- 9534: 2000429c .word 0x2000429c
> 38545- 9538: 20004298 .word 0x20004298
> 38546-
> 38547-0000953c <rtems_initialize_before_drivers>:
> 38548- * Scheduling can properly occur now as long as we avoid
> dispatching.
> 38549- */
> 38550-}
> 38551-
> --
> 48137-)
> 48138-{
> 48139- b3c4: 4770 bx lr
> 48140- b3c6: bf00 nop
> 48141-
> 48142:0000b3c8 <_Scheduler_default_Start_idle>:
> 48143-#if defined(RTEMS_SMP)
> 48144- Thread_Control *needs_help;
> 48145-
> 48146- needs_help =
> 48147-#endif
> 48148- ( *scheduler->Operations.unblock )( scheduler, the_thread );
> 48149: b3c8: 4801 ldr r0, [pc, #4] ; (b3d0
> <_Scheduler_default_Start_idle+0x8>)
> 48150- b3ca: 6943 ldr r3, [r0, #20]
> 48151- b3cc: 4718 bx r3
> 48152- b3ce: bf00 nop
> 48153- b3d0: 0001847c .word 0x0001847c
> 48154-
> 48155-0000b3d4 <_Scheduler_default_Tick>:
> 48156- /*
> 48157- * If the thread is not preemptible or is not ready, then
> 48158- * just return.
> 48159- */
> 48160-
> 48161- if ( !executing->is_preemptible )
> --
> 49735- b988: 0001847c .word 0x0001847c
> 49736- b98c: 0001d828 .word 0x0001d828
> 49737- b990: 0001d814 .word 0x0001d814
> 49738- b994: 0001d878 .word 0x0001d878
> 49739-
> 49740:0000b998 <_Thread_Create_idle>:
> 49741- cpu
> 49742- );
> 49743-}
> 49744-
> 49745:void _Thread_Create_idle( void )
> 49746-{
> 49747- b998: b5f0 push {r4, r5, r6, r7, lr}
> 49748- return maximum_internal_threads;
> 49749-}
> 49750-
> 49751-RTEMS_INLINE_ROUTINE Thread_Control *_Thread_Internal_allocate( void )
> 49752-{
> 49753- return (Thread_Control *)
> 49754: b99a: 4f17 ldr r7, [pc, #92] ; (b9f8
> <_Thread_Create_idle+0x60>)
> 49755- b99c: b089 sub sp, #36 ; 0x24
> 49756- b99e: 4638 mov r0, r7
> 49757- b9a0: f7fe ff74 bl a88c <_Objects_Allocate_unprotected>
> 49758- _Thread_Initialize(
> 49759- &_Thread_Internal_information,
> 49760: idle,
> 49761- _Scheduler_Get_by_CPU( cpu ),
> 49762- NULL, /* allocate the stack */
> 49763: _Stack_Ensure_minimum(
> rtems_configuration_get_idle_task_stack_size() ),
> 49764: b9a4: 4e15 ldr r6, [pc, #84] ; (b9fc
> <_Thread_Create_idle+0x64>)
> 49765- *
> 49766- * @return This method returns the minimum stack size;
> 49767- */
> 49768-RTEMS_INLINE_ROUTINE uint32_t _Stack_Minimum (void)
> 49769-{
> 49770- return rtems_minimum_stack_size;
> 49771: b9a6: 4a16 ldr r2, [pc, #88] ; (ba00
> <_Thread_Create_idle+0x68>)
> 49772- b9a8: 6a73 ldr r3, [r6, #36] ; 0x24
> 49773- b9aa: 6811 ldr r1, [r2, #0]
> 49774- b9ac: 4605 mov r5, r0
> 49775- b9ae: 428b cmp r3, r1
> 49776- b9b0: bf38 it cc
> 49777- b9b2: 460b movcc r3, r1
> 49778- * fields not explicitly assigned were explicitly zeroed by
> 49779- * _Workspace_Initialization.
> 49780- */
> 49781: idle = _Thread_Internal_allocate();
> 49782-
> 49783- _Thread_Initialize(
> 49784: b9b4: 4a13 ldr r2, [pc, #76] ; (ba04
> <_Thread_Create_idle+0x6c>)
> 49785:static void _Thread_Create_idle_for_cpu( Per_CPU_Control *cpu )
> 49786-{
> 49787- Objects_Name name;
> 49788: Thread_Control *idle;
> 49789-
> 49790- name.name_u32 = _Objects_Build_name( 'I', 'D', 'L', 'E' );
> 49791: b9b6: f8df e058 ldr.w lr, [pc, #88] ; ba10
> <_Thread_Create_idle+0x78>
> 49792- * fields not explicitly assigned were explicitly zeroed by
> 49793- * _Workspace_Initialization.
> 49794- */
> 49795: idle = _Thread_Internal_allocate();
> 49796-
> 49797- _Thread_Initialize(
> 49798- b9ba: 7811 ldrb r1, [r2, #0]
> 49799- b9bc: 2400 movs r4, #0
> 49800- b9be: 2201 movs r2, #1
> 49801- b9c0: 9300 str r3, [sp, #0]
> 49802- b9c2: 9102 str r1, [sp, #8]
> 49803- b9c4: f8cd e01c str.w lr, [sp, #28]
> 49804- b9c8: 4629 mov r1, r5
> 49805- b9ca: 4623 mov r3, r4
> 49806- b9cc: 9203 str r2, [sp, #12]
> 49807- b9ce: 4638 mov r0, r7
> 49808- b9d0: 9401 str r4, [sp, #4]
> 49809- b9d2: 9404 str r4, [sp, #16]
> 49810- b9d4: 9405 str r4, [sp, #20]
> 49811- b9d6: 9406 str r4, [sp, #24]
> 49812: b9d8: 4a0b ldr r2, [pc, #44] ; (ba08
> <_Thread_Create_idle+0x70>)
> 49813- b9da: f000 f96d bl bcb8 <_Thread_Initialize>
> 49814- * MUST be done before _Thread_Start is invoked.
> 49815- */
> 49816- cpu->heir =
> 49817: cpu->executing = idle;
> 49818-
> 49819- _Thread_Start(
> 49820- b9de: 6a32 ldr r2, [r6, #32]
> 49821- /*
> 49822- * WARNING!!! This is necessary to "kick" start the system and
> 49823- * MUST be done before _Thread_Start is invoked.
> 49824- */
> 49825- cpu->heir =
> 49826: cpu->executing = idle;
> 49827: b9e0: 4e0a ldr r6, [pc, #40] ; (ba0c
> <_Thread_Create_idle+0x74>)
> 49828-
> 49829- _Thread_Start(
> 49830- b9e2: 9400 str r4, [sp, #0]
> 49831- b9e4: 9601 str r6, [sp, #4]
> 49832- b9e6: 4628 mov r0, r5
> 49833- b9e8: 4621 mov r1, r4
> 49834- b9ea: 4623 mov r3, r4
> 49835- /*
> 49836- * WARNING!!! This is necessary to "kick" start the system and
> 49837- * MUST be done before _Thread_Start is invoked.
> 49838- */
> 49839- cpu->heir =
> 49840: cpu->executing = idle;
> 49841- b9ec: 60b5 str r5, [r6, #8]
> 49842-
> 49843- /*
> 49844- * WARNING!!! This is necessary to "kick" start the system and
> 49845- * MUST be done before _Thread_Start is invoked.
> 49846- */
> 49847- cpu->heir =
> 49848- b9ee: 60f5 str r5, [r6, #12]
> 49849: cpu->executing = idle;
> 49850-
> 49851- _Thread_Start(
> 49852- b9f0: f000 fee0 bl c7b4 <_Thread_Start>
> 49853-
> 49854- if ( _Per_CPU_Is_processor_started( cpu ) ) {
> 49855: _Thread_Create_idle_for_cpu( cpu );
> 49856- }
> 49857- }
> 49858-}
> 49859- b9f4: b009 add sp, #36 ; 0x24
> 49860- b9f6: bdf0 pop {r4, r5, r6, r7, pc}
> 49861- b9f8: 200042c0 .word 0x200042c0
> 49862- b9fc: 000183c0 .word 0x000183c0
> 49863- ba00: 200011c0 .word 0x200011c0
> 49864- ba04: 200011bc .word 0x200011bc
> 49865- ba08: 0001847c .word 0x0001847c
> 49866- ba0c: 20004640 .word 0x20004640
> 49867- ba10: 49444c45 .word 0x49444c45
> --
> 54093- const Scheduler_Control *scheduler,
> 54094- Thread_Control *the_thread,
> 54095- Per_CPU_Control *cpu
> 54096-)
> 54097-{
> 54098: ( *scheduler->Operations.start_idle )( scheduler, the_thread, cpu );
> 54099- c7de: 4809 ldr r0, [pc, #36] ; (c804
> <_Thread_Start+0x50>)
> 54100- _Thread_Ready( the_thread );
> 54101- } else {
> 54102- const Scheduler_Control *scheduler = _Scheduler_Get_by_CPU(
> cpu );
> 54103-
> 54104- if ( scheduler != NULL ) {
> 54105- the_thread->current_state = STATES_READY;
> 54106- c7e0: 2200 movs r2, #0
> 54107- c7e2: 612a str r2, [r5, #16]
> 54108- c7e4: 6b43 ldr r3, [r0, #52] ; 0x34
> 54109- c7e6: 4629 mov r1, r5
> 54110- c7e8: 9a05 ldr r2, [sp, #20]
>
> On Wed, Apr 24, 2019 at 2:59 PM Christian Mauderer
> <christian.mauderer at embedded-brains.de
> <mailto:christian.mauderer at embedded-brains.de>> wrote:
>
> Am 24.04.19 um 02:35 schrieb Jython:
> > yes, I need to do low power for stm32f4
> > will this line work __asm__ volatile ("wfi");?
>
> That line should be correct. Please note that the instruction is already
> used in the armv7 idle thread:
>
> https://git.rtems.org/rtems/tree/cpukit/score/cpu/arm/armv7-thread-idle.c#n32
>
> The stm32f4 is a Cortex-M4 so it's quite likely that this routine is
> used. You can check by doing an "arm-rtems5-objdump -dS" on your file
> and search for the idle body.
>
> With kind regards
>
> Christian
>
> >
> >
> > On Tue, Apr 23, 2019 at 10:28 PM Christian Mauderer
> > <christian.mauderer at embedded-brains.de
> <mailto:christian.mauderer at embedded-brains.de>
> > <mailto:christian.mauderer at embedded-brains.de
> <mailto:christian.mauderer at embedded-brains.de>>> wrote:
> >
> > Am 22.04.19 um 09:47 schrieb Jython:
> > > HI, ALL!
> > > wfi
> >
> http://www.keil.com/support/man/docs/armcc/armcc_chr1359125004400.htm
> > > how can i call the arm __wfi?
> > >
> > > _______________________________________________
> > > users mailing list
> > > users at rtems.org <mailto:users at rtems.org>
> <mailto:users at rtems.org <mailto:users at rtems.org>>
> > > http://lists.rtems.org/mailman/listinfo/users
> > >
> >
> > Hello Jython,
> >
> > WFI is an assembler instruction. The Keil wrapper isn't
> available in
> > gcc. I know of no direct replacement. Most likely you need a
> gcc inline
> > assembly for that.
> >
> > May I ask why you would need "wfi"? If you use a operating
> system, the
> > system typically handles such low level stuff for you. The only
> > application that springs to mind for that instruction is
> overwriting the
> > idle loop to save energy.
> >
> > Best regards
> >
> > Christian
> >
> > --
> > --------------------------------------------
> > embedded brains GmbH
> > Herr Christian Mauderer
> > Dornierstr. 4
> > D-82178 Puchheim
> > Germany
> > email: christian.mauderer at embedded-brains.de
> <mailto:christian.mauderer at embedded-brains.de>
> > <mailto:christian.mauderer at embedded-brains.de
> <mailto:christian.mauderer at embedded-brains.de>>
> > Phone: +49-89-18 94 741 - 18
> > Fax: +49-89-18 94 741 - 08
> > PGP: Public key available on request.
> >
> > Diese Nachricht ist keine geschäftliche Mitteilung im Sinne
> des EHUG.
> >
>
> --
> --------------------------------------------
> embedded brains GmbH
> Herr Christian Mauderer
> Dornierstr. 4
> D-82178 Puchheim
> Germany
> email: christian.mauderer at embedded-brains.de
> <mailto:christian.mauderer at embedded-brains.de>
> Phone: +49-89-18 94 741 - 18
> Fax: +49-89-18 94 741 - 08
> PGP: Public key available on request.
>
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>
--
--------------------------------------------
embedded brains GmbH
Herr Christian Mauderer
Dornierstr. 4
D-82178 Puchheim
Germany
email: christian.mauderer at embedded-brains.de
Phone: +49-89-18 94 741 - 18
Fax: +49-89-18 94 741 - 08
PGP: Public key available on request.
Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
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