| /* Copyright 2018 The ChromiumOS Authors |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| * |
| * Cortex-M CPU vector table |
| */ |
| |
| #ifndef ___INIT |
| #define ___INIT |
| #include "compiler.h" |
| #include "config.h" |
| |
| #include <task.h> |
| #endif |
| |
| typedef void (*func)(void); |
| |
| #ifndef PASS |
| #define PASS 1 |
| #endif |
| |
| #if PASS == 1 |
| /* Default exception handler */ |
| void __attribute__((used, naked)) default_handler(void); |
| void default_handler(void) |
| { |
| asm(".thumb_func\n" |
| " b exception_panic"); |
| } |
| |
| #define table(x) x |
| |
| #define weak_with_default __attribute__((used, weak, alias("default_handler"))) |
| |
| #define vec(name) extern void weak_with_default name##_handler(void); |
| #define irq(num) vec(irq_##num) |
| |
| #define item(name) extern void name(void); |
| #define null |
| |
| extern void stack_end(void); /* not technically correct, it's just a pointer */ |
| extern void reset(void); |
| |
| DISABLE_GCC_WARNING("-Wattribute-alias") |
| /* Call default_handler if svc_handler is not found (task.c is not built) */ |
| void weak_with_default svc_handler(int desched, task_id_t resched); |
| ENABLE_GCC_WARNING("-Wattribute-alias") |
| |
| /* |
| * SVC handler helper |
| * |
| * Work around issue where a late exception can corrupt r0 to r3, |
| * see section 2.7 (svc) of Cortex-M3 Application Note 179: |
| * http://infocenter.arm.com/help/topic/com.arm.doc.dai0179b/AppsNote179.pdf |
| * |
| * This approach differs slightly from the one in the document, |
| * it only loads r0 (desched) and r1 (resched) for svc_handler. |
| */ |
| void __attribute__((used, naked)) svc_helper_handler(void); |
| void svc_helper_handler(void) |
| { |
| asm(".thumb_func\n" |
| " tst lr, #4 /* see if called from supervisor mode */\n" |
| " mrs r2, msp /* get the correct stack pointer into r2 */\n" |
| " it ne\n" |
| " mrsne r2, psp\n" |
| " ldr r1, [r2, #4] /* get regs from stack frame */\n" |
| " ldr r0, [r2]\n" |
| " b %0 /* call svc_handler */\n" |
| : |
| : "i"(svc_handler)); |
| } |
| |
| #endif /* PASS 1 */ |
| |
| #if PASS == 2 |
| #undef table |
| #undef vec |
| #undef irq |
| #undef item |
| #undef null |
| |
| /* number of elements before the first irq vector */ |
| #define IRQ_OFFSET 16 |
| /* element in the table that is null: extra IRQs are routed there, |
| * then finally overwritten |
| */ |
| #define IRQ_UNUSED_OFFSET 8 |
| |
| /* Disable warning that "initializer overrides prior initialization of this |
| * subobject", since we are explicitly doing this to handle the unused IRQs. |
| */ |
| DISABLE_CLANG_WARNING("-Winitializer-overrides") |
| |
| #define table(x) \ |
| const func vectors[] __attribute__((section( \ |
| ".text.vecttable"))) = { x[IRQ_UNUSED_OFFSET] = null }; |
| |
| #define vec(name) name##_handler, |
| #define irq(num) \ |
| [num < CONFIG_IRQ_COUNT ? num + IRQ_OFFSET : IRQ_UNUSED_OFFSET] = \ |
| vec(irq_##num) |
| |
| #define item(name) name, |
| #define null (void *)0, |
| #endif /* PASS 2 */ |
| |
| table(item(stack_end) item(reset) vec(nmi) vec(hard_fault) vec(mpu_fault) vec( |
| bus_fault) vec(usage_fault) null null null null item(svc_helper_handler) vec(debug) |
| null vec(pendsv) vec(sys_tick) irq(0) irq(1) irq(2) irq(3) irq(4) irq( |
| 5) irq(6) irq(7) irq(8) irq(9) irq(10) irq(11) irq(12) irq(13) |
| irq(14) irq(15) irq(16) irq(17) irq(18) irq(19) irq(20) irq( |
| 21) irq(22) irq(23) irq(24) irq(25) irq(26) irq(27) |
| irq(28) irq(29) irq(30) irq(31) irq(32) irq(33) irq( |
| 34) irq(35) irq(36) irq(37) irq(38) irq(39) |
| irq(40) irq(41) irq(42) irq(43) irq(44) irq( |
| 45) irq(46) irq(47) irq(48) irq(49) |
| irq(50) irq(51) irq(52) irq(53) irq( |
| 54) irq(55) irq(56) irq(57) |
| irq(58) irq(59) irq(60) irq( |
| 61) irq(62) irq(63) |
| irq(64) irq(65) irq( |
| 66) irq(67) |
| irq(68) irq( |
| 69) irq(70) |
| irq(71) irq(72) irq(73) irq(74) irq(75) irq(76) irq(77) irq(78) irq(79) irq(80) irq(81) irq(82) irq(83) irq(84) irq(85) irq(86) irq(87) irq(88) irq(89) irq(90) irq(91) irq(92) irq(93) irq(94) irq(95) irq(96) irq(97) irq( |
| 98) irq(99) |
| irq(100) irq(101) irq(102) irq(103) irq(104) irq(105) irq(106) irq( |
| 107) irq(108) irq(109) irq(110) irq(111) irq(112) irq(113) irq(114) irq(115) |
| irq(116) irq(117) irq(118) irq(119) irq(120) irq(121) irq(122) irq( |
| 123) irq(124) irq(125) irq(126) irq(127) irq(128) irq(129) irq(130) irq(131) |
| irq(132) irq(133) irq(134) irq(135) irq(136) irq(137) irq(138) irq( |
| 139) irq(140) irq(141) irq(142) irq(143) irq(144) irq(145) irq(146) irq(147) |
| irq(148) irq(149) irq(150) irq(151) irq(152) irq(153) irq(154) irq( |
| 155) irq(156) irq(157) irq(158) irq(159) irq(160) irq(161) irq(162) irq(163) |
| irq(164) irq(165) irq(166) irq(167) irq(168) irq(169) irq(170) irq( |
| 171) irq(172) irq(173) irq(174) irq(175) irq(176) irq(177) irq(178) |
| irq(179) irq(180) irq(181) irq(182) irq(183) irq(184) irq(185) irq( |
| 186) irq(187) irq(188) irq(189) irq(190) irq(191) irq(192) |
| irq(193) irq(194) irq(195) irq(196) irq(197) irq(198) irq( |
| 199) irq(200) irq(201) irq(202) irq(203) irq(204) |
| irq(205) irq(206) irq(207) irq(208) irq(209) irq( |
| 210) irq(211) irq(212) irq(213) irq(214) |
| irq(215) irq(216) irq(217) irq(218) irq( |
| 219) irq(220) irq(221) irq(222) |
| irq(223) irq(224) irq(225) irq( |
| 226) irq(227) irq(228) |
| irq(229) irq(230) irq(231) irq( |
| 232) irq(233) irq(234) |
| irq(235) irq(236) irq( |
| 237) irq(238) |
| irq(239)) |
| |
| #if PASS == 2 |
| ENABLE_CLANG_WARNING("-Winitializer-overrides") |
| #endif |
| |
| #if PASS == 1 |
| #undef PASS |
| #define PASS 2 |
| #include "vecttable.c" |
| #endif |
