diff options
Diffstat (limited to 'newlib/libc/sys/arm/crt0.S')
| -rw-r--r-- | newlib/libc/sys/arm/crt0.S | 69 |
1 files changed, 13 insertions, 56 deletions
diff --git a/newlib/libc/sys/arm/crt0.S b/newlib/libc/sys/arm/crt0.S index c750ca819..9d1de2ec6 100644 --- a/newlib/libc/sys/arm/crt0.S +++ b/newlib/libc/sys/arm/crt0.S @@ -1,4 +1,3 @@ -#include "newlib.h" #include "swi.h" /* ANSI concatenation macros. */ @@ -11,37 +10,17 @@ #error __USER_LABEL_PREFIX is not defined #endif -#ifdef HAVE_INITFINI_ARRAY -#define _init __libc_init_array -#define _fini __libc_fini_array -#endif - /* .text is used instead of .section .text so it works with arm-aout too. */ .text -#if defined(__thumb2__) - .syntax unified - .thumb -.macro FUNC_START name - .global \name - .thumb_func -\name: -.endm -#else .code 32 -.macro FUNC_START name - .global \name -\name: -.endm -#endif .align 0 - FUNC_START _mainCRTStartup - FUNC_START _start - FUNC_START start -#if defined(__ELF__) && !defined(__USING_SJLJ_EXCEPTIONS__) - /* Annotation for EABI unwinding tables. */ - .fnstart -#endif + .global _mainCRTStartup + .global _start + .global start +start: +_start: +_mainCRTStartup: /* Start by setting up a stack */ #ifdef ARM_RDP_MONITOR @@ -56,12 +35,7 @@ /* Issue Angel SWI to read stack info */ mov r0, #AngelSWI_Reason_HeapInfo adr r1, .LC0 /* point at ptr to 4 words to receive data */ -#if defined(__thumb2__) - bkpt AngelSWI -#else - /* We are always in ARM mode for startup */ - AngelSWIAsm AngelSWI_ARM -#endif + swi AngelSWI_ARM /* We are always in ARM mode for startup */ ldr r0, .LC0 /* point at values read */ ldr sp, [r0, #8] ldr sl, [r0, #12] @@ -81,7 +55,6 @@ sub sl, sp, #64 << 10 /* Still assumes 256bytes below sl */ #endif #endif - /* Zero the memory in the .bss section. */ mov a2, #0 /* Second arg: fill value */ mov fp, a2 /* Null frame pointer */ mov r7, a2 /* Null frame pointer for Thumb */ @@ -91,8 +64,8 @@ sub a3, a3, a1 /* Third arg: length of block */ -#if defined(__thumb__) && !defined(__thumb2__) - /* Enter Thumb mode.... */ +#ifdef __thumb__ /* Enter Thumb mode.... */ + add a4, pc, #1 /* Get the address of the Thumb block */ bx a4 /* Go there and start Thumb decoding */ @@ -116,17 +89,11 @@ __change_mode: #else mov r0, #AngelSWI_Reason_GetCmdLine adr r1, .LC30 /* Space for command line */ - AngelSWIAsm AngelSWI + swi AngelSWI ldr r1, .LC30 #endif /* Parse string at r1 */ mov r0, #0 /* count of arguments so far */ - /* Push a NULL argument onto the end of the list. */ -#ifdef __thumb__ - push {r0} -#else - stmfd sp!, {r0} -#endif .LC10: /* Skip leading blanks */ #ifdef __thumb__ @@ -202,11 +169,6 @@ __change_mode: add r3, #4 b .LC15 .LC14: - /* Ensure doubleword stack alignment. */ - mov r4, sp - mov r5, #7 - bic r4, r5 - mov sp, r4 #else add r2, sp, r0, LSL #2 /* End of args */ mov r3, sp /* Start of args */ @@ -216,9 +178,8 @@ __change_mode: strhi r5, [r2, #-4]! strhi r4, [r3], #4 bhi .LC13 - /* Ensure doubleword stack alignment. */ - bic sp, sp, #7 #endif + #endif #ifdef __USES_INITFINI__ @@ -238,7 +199,7 @@ __change_mode: bl FUNCTION (exit) /* Should not return. */ -#if defined(__thumb__) && !defined(__thumb2__) +#ifdef __thumb__ /* Come out of Thumb mode. This code should be redundant. */ mov a4, pc @@ -270,11 +231,6 @@ change_back: #endif #endif #endif -#if defined(__ELF__) && !defined(__USING_SJLJ_EXCEPTIONS__) - /* Protect against unhandled exceptions. */ - .cantunwind - .fnend -#endif .LC1: .word __bss_start__ .LC2: @@ -303,3 +259,4 @@ CommandLine: .space 256,0 /* Maximum length of 255 chars handled. */ .section .idata$3 .long 0,0,0,0,0,0,0,0 #endif + |