mirror of https://github.com/ARMmbed/mbed-os.git
M2351: Refactor startup file
1. Re-organize to make clear for all targets/toolchains support in single startup file 2. Inline assembly syntax is limited, esp. on IAR. Try paving the way for accessing external symbols still in inline assembly instead of re-write in assembly.pull/12366/head
Chun-Chieh Li
parent
c168e147d6
commit
9faa236dfc
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@ -54,18 +54,33 @@ void FUN(void) __attribute__ ((weak, alias(#FUN_ALIAS)));
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#endif
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/* Initialize segments */
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#if defined(__ARMCC_VERSION)
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#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) && (TFM_LVL > 0)
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extern uint32_t Image$$ARM_LIB_STACK_MSP$$ZI$$Limit;
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extern uint32_t Image$$ARM_LIB_STACK$$ZI$$Limit;
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#else
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extern uint32_t Image$$ARM_LIB_STACK$$ZI$$Limit;
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#endif
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extern void __main(void);
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#elif defined(__ICCARM__)
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#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) && (TFM_LVL > 0)
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extern uint32_t Image$$ARM_LIB_STACK_MSP$$ZI$$Limit;
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extern uint32_t Image$$ARM_LIB_STACK$$ZI$$Limit;
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extern uint32_t CSTACK_MSP$$Limit;
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extern uint32_t CSTACK$$Limit;
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#else
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extern uint32_t Image$$ARM_LIB_STACK$$ZI$$Limit;
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extern uint32_t CSTACK$$Limit;
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#endif
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void __iar_program_start(void);
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#elif defined(__GNUC__)
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#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) && (TFM_LVL > 0)
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extern uint32_t Image$$ARM_LIB_STACK_MSP$$ZI$$Limit;
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extern uint32_t Image$$ARM_LIB_STACK$$ZI$$Limit;
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#else
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extern uint32_t Image$$ARM_LIB_STACK$$ZI$$Limit;
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#endif
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extern uint32_t __StackTop;
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extern uint32_t __copy_table_start__;
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extern uint32_t __copy_table_end__;
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@ -195,12 +210,6 @@ WEAK_ALIAS_FUNC(TRNG_IRQHandler, Default_Handler) // 101:
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__attribute__ ((section("RESET")))
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const uint32_t __vector_handlers[] = {
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#elif defined(__ICCARM__)
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#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) && (TFM_LVL > 0)
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extern uint32_t CSTACK_MSP$$Limit;
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extern uint32_t CSTACK$$Limit;
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#else
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extern uint32_t CSTACK$$Limit;
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#endif
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const uint32_t __vector_table[] @ ".intvec" = {
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#elif defined(__GNUC__)
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__attribute__ ((section(".vector_table")))
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@ -347,47 +356,61 @@ const uint32_t __vector_handlers[] = {
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(uint32_t) TRNG_IRQHandler, // 101:
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};
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#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
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/* Some reset handler code cannot implement in pure C. Implement it in inline/embedded assembly.
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*
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* Reset_Handler:
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* For non-secure PSA/non-secure non-PSA/secure non-PSA, do as usual
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* For secure PSA, switch from MSP to PSP, then jump to Reset_Handler_1 for usual work
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* For non-secure PSA/non-secure non-PSA/secure non-PSA, jump directly to Reset_Handler_1
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* For secure PSA, switch from MSP to PSP, then jump to Reset_Handler_1
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*
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* Reset_Handler_1
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* Reset_Handler_1:
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* Platform initialization
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* C/C++ runtime initialization
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*/
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/* Forward declaration */
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#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) && (TFM_LVL > 0)
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/* Limited by inline assembly syntax, esp. on IAR, we cannot get stack limit
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* for PSP just from external symbol. To avoid re-write in assembly, We make up
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* a function here to get this value indirectly. */
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uint32_t StackLimit_PSP(void);
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#endif
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void Reset_Handler_1(void);
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/* Add '__attribute__((naked))' here to make sure compiler does not generate prologue and
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* epilogue sequences for Reset_Handler. We don't want MSP is updated by compiler-generated
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* code during stack switch. */
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* code during stack switch.
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*
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* Don't allow extended assembly in naked functions:
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* The compiler only supports basic __asm statements in __attribute__((naked))
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* functions. Using extended assembly, parameter references or mixing C code with
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* __asm statements might not work reliably.
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*/
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__attribute__((naked)) void Reset_Handler(void)
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{
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#if !defined(__ICCARM__)
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#if defined(__GNUC__)
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__asm(".syntax unified \n");
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__asm(".globl Reset_Handler_1 \n");
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#endif
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/* Secure TFM requires PSP as boot stack */
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#if TFM_LVL != 0
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#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) && (TFM_LVL > 0)
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/* Get stack limit for PSP */
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#if !defined(__ICCARM__)
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__asm(".globl Image$$ARM_LIB_STACK$$ZI$$Limit \n");
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__asm("movw r0, #:lower16:Image$$ARM_LIB_STACK$$ZI$$Limit \n"); // Initialize PSP
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__asm("movt r0, #:upper16:Image$$ARM_LIB_STACK$$ZI$$Limit \n");
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__asm("movw r0, #:lower16:StackLimit_PSP \n");
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__asm("movt r0, #:upper16:StackLimit_PSP \n");
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#else
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__asm(".globl Image$$ARM_LIB_STACK$$ZI$$Limit \n");
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__asm("mov32 r0, Image$$ARM_LIB_STACK$$ZI$$Limit \n");
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__asm("mov32 r0, StackLimit_PSP \n");
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#endif
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__asm("blx r0 \n");
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/* Switch from MSP to PSP */
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__asm("msr psp, r0 \n");
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__asm("mrs r0, control \n"); // Switch SP to PSP
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__asm("mrs r0, control \n");
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__asm("movs r1, #2 \n");
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__asm("orrs r0, r1 \n");
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__asm("msr control, r0 \n");
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#endif
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/* Jump to Reset_Handler_1 */
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#if !defined(__ICCARM__)
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__asm("movw r0, #:lower16:Reset_Handler_1 \n");
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__asm("movt r0, #:upper16:Reset_Handler_1 \n");
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@ -397,15 +420,27 @@ __attribute__((naked)) void Reset_Handler(void)
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__asm("bx r0 \n");
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}
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#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) && (TFM_LVL > 0)
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/* Return stack limit for PSP */
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uint32_t StackLimit_PSP(void)
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{
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uint32_t stacklimit_psp;
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__asm volatile (
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#if defined(__GNUC__)
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".syntax unified \n"
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#endif
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"mov %[Rd], %[Rn] \n"
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: [Rd] "=r" (stacklimit_psp) /* comma-separated list of output operands */
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: [Rn] "r" (&Image$$ARM_LIB_STACK$$ZI$$Limit) /* comma-separated list of input operands */
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: "cc" /* comma-separated list of clobbered resources */
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);
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return stacklimit_psp;
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}
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#endif
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void Reset_Handler_1(void)
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#else
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void Reset_Handler(void)
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#endif /* defined(__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) */
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{
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#if defined(__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
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/* Disable register write-protection function */
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