Align comments and spaces in libgloss/arm/crt0.S and newlib/libc/sys/arm/crt0.S to ease further code alignment.
This commit is contained in:
Alexander Fedotov
Richard Earnshaw
parent
cc430406ac
commit
a0b0a4a018
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@ -68,8 +68,10 @@
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#endif
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.endm
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/*******************************************************************************
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* Main library startup code.
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*******************************************************************************/
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.align 0
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FUNC_START _mainCRTStartup
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FUNC_START _start
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#if defined(__ELF__) && !defined(__USING_SJLJ_EXCEPTIONS__)
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@ -90,14 +92,14 @@
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#endif
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#endif
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/* Start by setting up a stack */
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/* Start by setting up a stack. */
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#ifdef ARM_RDP_MONITOR
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/* Issue Demon SWI to read stack info */
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swi SWI_GetEnv /* Returns command line in r0 */
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mov sp,r1 /* and the highest memory address in r1 */
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/* Issue Demon SWI to read stack info. */
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swi SWI_GetEnv /* Returns command line in r0. */
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mov sp,r1 /* and the highest memory address in r1. */
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/* stack limit is at end of data */
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/* allow slop for stack overflow handling and small frames */
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/* Stack limit is at end of data. */
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/* Allow slop for stack overflow handling and small frames. */
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#ifdef THUMB1_ONLY
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ldr r0, .LC2
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adds r0, #128
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@ -109,19 +111,19 @@
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#endif
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#else
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#ifdef ARM_RDI_MONITOR
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/* Issue Angel SWI to read stack info */
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/* Issue Angel SWI to read stack info. */
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movs r0, #AngelSWI_Reason_HeapInfo
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adr r1, .LC0 /* point at ptr to 4 words to receive data */
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adr r1, .LC0 /* Point at ptr to 4 words to receive data. */
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#ifdef THUMB_VXM
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bkpt AngelSWI
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#elif defined(__thumb2__)
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/* We are in thumb mode for startup on armv7 architectures. */
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/* We are in thumb mode for startup on armv7 architectures. */
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AngelSWIAsm (AngelSWI)
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#else
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/* We are always in ARM mode for startup on pre armv7 archs. */
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/* We are always in ARM mode for startup on pre armv7 archs. */
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AngelSWIAsm (AngelSWI_ARM)
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#endif
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ldr r0, .LC0 /* point at values read */
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ldr r0, .LC0 /* Point at values read. */
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/* Set __heap_limit. */
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ldr r1, [r0, #4]
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@ -148,14 +150,15 @@
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to skip setting sp/sl to 0 here.
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- Considering M-profile processors, We might want to initialize
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sp by the first entry of vector table and return 0 to SYS_HEAPINFO
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semihosting call, which will be skipped here. */
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semihosting call, which will be skipped here. */
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cmp r1, #0
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beq .LC26
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mov sp, r1
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.LC26:
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cmp r2, #0
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beq .LC27
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/* allow slop for stack overflow handling and small frames */
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/* Allow slop for stack overflow handling and small frames. */
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#ifdef THUMB1_ONLY
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adds r2, #128
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adds r2, #128
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@ -163,9 +166,10 @@
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#else
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add sl, r2, #256
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#endif
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.LC27:
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#else
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/* Set up the stack pointer to a fixed value */
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/* Set up the stack pointer to a fixed value. */
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/* Changes by toralf:
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- Allow linker script to provide stack via __stack symbol - see
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defintion of .Lstack
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@ -175,7 +179,7 @@
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Loosely based on init.s from ARM/Motorola example code.
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Note: Mode switch via CPSR is not allowed once in non-privileged
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mode, so we take care not to enter "User" to set up its sp,
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and also skip most operations if already in that mode. */
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and also skip most operations if already in that mode. */
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ldr r3, .Lstack
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cmp r3, #0
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@ -192,42 +196,42 @@
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/* Note: This 'mov' is essential when starting in User, and ensures we
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always get *some* sp value for the initial mode, even if we
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have somehow missed it below (in which case it gets the same
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value as FIQ - not ideal, but better than nothing.) */
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value as FIQ - not ideal, but better than nothing). */
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mov sp, r3
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#ifdef PREFER_THUMB
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/* XXX Fill in stack assignments for interrupt modes. */
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#else
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mrs r2, CPSR
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tst r2, #0x0F /* Test mode bits - in User of all are 0 */
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beq .LC23 /* "eq" means r2 AND #0x0F is 0 */
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msr CPSR_c, #0xD1 /* FIRQ mode, interrupts disabled */
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tst r2, #0x0F /* Test mode bits - in User of all are 0. */
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beq .LC23 /* "eq" means r2 AND #0x0F is 0. */
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msr CPSR_c, #0xD1 /* FIRQ mode, interrupts disabled. */
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mov sp, r3
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sub sl, sp, #0x1000 /* This mode also has its own sl (see below) */
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sub sl, sp, #0x1000 /* This mode also has its own sl (see below). */
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mov r3, sl
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msr CPSR_c, #0xD7 /* Abort mode, interrupts disabled */
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msr CPSR_c, #0xD7 /* Abort mode, interrupts disabled. */
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mov sp, r3
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sub r3, r3, #0x1000
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msr CPSR_c, #0xDB /* Undefined mode, interrupts disabled */
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msr CPSR_c, #0xDB /* Undefined mode, interrupts disabled. */
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mov sp, r3
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sub r3, r3, #0x1000
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msr CPSR_c, #0xD2 /* IRQ mode, interrupts disabled */
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msr CPSR_c, #0xD2 /* IRQ mode, interrupts disabled. */
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mov sp, r3
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sub r3, r3, #0x2000
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msr CPSR_c, #0xD3 /* Supervisory mode, interrupts disabled */
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msr CPSR_c, #0xD3 /* Supervisory mode, interrupts disabled. */
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mov sp, r3
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sub r3, r3, #0x8000 /* Min size 32k */
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bic r3, r3, #0x00FF /* Align with current 64k block */
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sub r3, r3, #0x8000 /* Min size 32k. */
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bic r3, r3, #0x00FF /* Align with current 64k block. */
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bic r3, r3, #0xFF00
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str r3, [r3, #-4] /* Move value into user mode sp without */
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ldmdb r3, {sp}^ /* changing modes, via '^' form of ldm */
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ldmdb r3, {sp}^ /* changing modes, via '^' form of ldm. */
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orr r2, r2, #0xC0 /* Back to original mode, presumably SVC, */
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msr CPSR_c, r2 /* with FIQ/IRQ disable bits forced to 1 */
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msr CPSR_c, r2 /* with FIQ/IRQ disable bits forced to 1. */
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#endif
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.LC23:
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/* Setup a default stack-limit in-case the code has been
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@ -243,24 +247,24 @@
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subs r2, r3, r2
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mov sl, r2
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#else
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sub sl, r3, #64 << 10 /* Still assumes 256bytes below sl */
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sub sl, r3, #64 << 10 /* Still assumes 256bytes below sl. */
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#endif
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#endif
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#endif
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/* Zero the memory in the .bss section. */
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movs a2, #0 /* Second arg: fill value */
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mov fp, a2 /* Null frame pointer */
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mov r7, a2 /* Null frame pointer for Thumb */
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movs a2, #0 /* Second arg: fill value. */
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mov fp, a2 /* Null frame pointer. */
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mov r7, a2 /* Null frame pointer for Thumb. */
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ldr a1, .LC1 /* First arg: start of memory block */
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ldr a1, .LC1 /* First arg: start of memory block. */
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ldr a3, .LC2
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subs a3, a3, a1 /* Third arg: length of block */
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subs a3, a3, a1 /* Third arg: length of block. */
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#if __thumb__ && !defined(PREFER_THUMB)
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/* Enter Thumb mode.... */
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add a4, pc, #1 /* Get the address of the Thumb block */
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bx a4 /* Go there and start Thumb decoding */
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/* Enter Thumb mode... */
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add a4, pc, #1 /* Get the address of the Thumb block. */
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bx a4 /* Go there and start Thumb decoding. */
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.code 16
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.global __change_mode
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@ -271,9 +275,8 @@ __change_mode:
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bl FUNCTION (memset)
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#if !defined (ARM_RDP_MONITOR) && !defined (ARM_RDI_MONITOR)
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/* Changes by toralf: Taken from libgloss/m68k/crt0.S
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* initialize target specific stuff. Only execute these
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* functions it they exist.
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*/
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initialize target specific stuff. Only execute these
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functions it they exist. */
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ldr r3, .Lhwinit
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cmp r3, #0
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beq .LC24
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@ -285,24 +288,24 @@ __change_mode:
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indirect_call r3
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.LC25:
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movs r0, #0 /* no arguments */
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movs r1, #0 /* no argv either */
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movs r0, #0 /* No arguments. */
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movs r1, #0 /* No argv either. */
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#else
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/* Need to set up standard file handles */
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/* Need to set up standard file handles. */
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bl FUNCTION (initialise_monitor_handles)
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#ifdef ARM_RDP_MONITOR
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swi SWI_GetEnv /* sets r0 to point to the command line */
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swi SWI_GetEnv /* Sets r0 to point to the command line. */
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movs r1, r0
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#else
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movs r0, #AngelSWI_Reason_GetCmdLine
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ldr r1, .LC30 /* Space for command line */
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ldr r1, .LC30 /* Space for command line. */
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AngelSWIAsm (AngelSWI)
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ldr r1, .LC30
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ldr r1, [r1]
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#endif
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/* Parse string at r1 */
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movs r0, #0 /* count of arguments so far */
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/* Parse string at r1. */
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movs r0, #0 /* Count of arguments so far. */
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/* Push a NULL argument onto the end of the list. */
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#ifdef __thumb__
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push {r0}
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@ -310,7 +313,7 @@ __change_mode:
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stmfd sp!, {r0}
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#endif
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.LC10:
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/* Skip leading blanks */
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/* Skip leading blanks. */
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#ifdef __thumb__
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ldrb r3, [r1]
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adds r1, #1
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@ -322,7 +325,7 @@ __change_mode:
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cmp r3, #' '
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beq .LC10
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/* See whether we are scanning a string */
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/* See whether we are scanning a string. */
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cmp r3, #'"'
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#ifdef __thumb__
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beq .LC20
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@ -333,17 +336,17 @@ __change_mode:
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b .LC22
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.LC21:
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movs r2, #' ' /* terminator type */
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subs r1, r1, #1 /* adjust back to point at start char */
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movs r2, #' ' /* Terminator type. */
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subs r1, r1, #1 /* Adjust back to point at start char. */
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.LC22:
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#else
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cmpne r3, #'\''
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moveq r2, r3
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movne r2, #' ' /* terminator type */
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subne r1, r1, #1 /* adjust back to point at start char */
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movne r2, #' ' /* Terminator type. */
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subne r1, r1, #1 /* Adjust back to point at start char. */
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#endif
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/* Stack a pointer to the current argument */
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/* Stack a pointer to the current argument. */
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#ifdef __thumb__
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push {r1}
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#else
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@ -359,16 +362,16 @@ __change_mode:
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#endif
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cmp r3, #0
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beq .LC12
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cmp r2, r3 /* reached terminator? */
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cmp r2, r3 /* Reached terminator ? */
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bne .LC11
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movs r2, #0
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subs r3, r1, #1
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strb r2, [r3] /* terminate the arg string */
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strb r2, [r3] /* Terminate the arg string. */
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b .LC10
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.LC12:
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mov r1, sp /* point at stacked arg pointers */
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/* We've now got the stacked args in order reverse the */
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mov r1, sp /* Point at stacked arg pointers. */
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/* We've now got the stacked args in order, reverse them. */
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#ifdef __thumb__
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movs r2, r0
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lsls r2, #2
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@ -390,10 +393,10 @@ __change_mode:
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bics r4, r5
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mov sp, r4
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#else
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add r2, sp, r0, LSL #2 /* End of args */
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mov r3, sp /* Start of args */
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add r2, sp, r0, LSL #2 /* End of args. */
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mov r3, sp /* Start of args. */
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.LC13: cmp r2, r3
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ldrhi r4,[r2, #-4] /* Reverse ends of list */
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ldrhi r4,[r2, #-4] /* Reverse ends of list. */
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ldrhi r5, [r3]
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strhi r5, [r2, #-4]!
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strhi r4, [r3], #4
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@ -431,7 +434,6 @@ __change_mode:
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#if __thumb__ && !defined(PREFER_THUMB)
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/* Come out of Thumb mode. This code should be redundant. */
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mov a4, pc
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bx a4
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@ -447,7 +449,6 @@ change_back:
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/* For Thumb, constants must be after the code since only
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positive offsets are supported for PC relative addresses. */
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.align 0
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.LC0:
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#ifdef ARM_RDI_MONITOR
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@ -457,13 +458,13 @@ change_back:
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/* Changes by toralf: Provide alternative "stack" variable whose value
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may be defined externally; .Lstack will be used instead of .LC0 if
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it points to a non-0 value. Also set up references to "hooks" that
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may be used by the application to provide additional init code. */
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may be used by the application to provide additional init code. */
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#ifdef __pe__
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.word 0x800000
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#else
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.word 0x80000 /* Top of RAM on the PIE board. */
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#endif
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.Lstack:
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.word __stack
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.Lhwinit:
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@ -476,7 +477,7 @@ change_back:
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runtime (meaning "ignore setting") for the variables, when the user
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does not provide the symbols. (The linker uses a weak symbol if,
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and only if, a normal version of the same symbol isn't provided
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e.g. by a linker script or another object file.) */
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e.g. by a linker script or another object file.) */
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.weak __stack
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.weak FUNCTION (hardware_init_hook)
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@ -50,13 +50,13 @@
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.global \name
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.thumb_func
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\name:
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.endm
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.endm
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#else
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.code 32
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.macro FUNC_START name
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.global \name
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.global \name
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\name:
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.endm
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.endm
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#endif
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.macro indirect_call reg
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@ -68,8 +68,10 @@
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#endif
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.endm
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/*******************************************************************************
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* Main library startup code.
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*******************************************************************************/
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.align 0
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FUNC_START _mainCRTStartup
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FUNC_START _start
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#if defined(__ELF__) && !defined(__USING_SJLJ_EXCEPTIONS__)
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@ -399,7 +401,7 @@ __change_mode:
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bl FUNCTION (_init)
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movs r0, r4
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movs r1, r5
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#endif
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#endif
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bl FUNCTION (main)
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bl FUNCTION (exit) /* Should not return. */
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@ -420,7 +422,7 @@ change_back:
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#endif
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/* For Thumb, constants must be after the code since only
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positive offsets are supported for PC relative addresses. */
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positive offsets are supported for PC relative addresses. */
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.align 0
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.LC0:
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#ifdef ARM_RDI_MONITOR
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@ -430,7 +432,7 @@ change_back:
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/* Changes by toralf: Provide alternative "stack" variable whose value
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may be defined externally; .Lstack will be used instead of .LC0 if
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it points to a non-0 value. Also set up references to "hooks" that
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may be used by the application to provide additional init code. */
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may be used by the application to provide additional init code. */
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#ifdef __pe__
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.word 0x800000
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#else
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@ -449,7 +451,7 @@ change_back:
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runtime (meaning "ignore setting") for the variables, when the user
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does not provide the symbols. (The linker uses a weak symbol if,
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and only if, a normal version of the same symbol isn't provided
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e.g. by a linker script or another object file). */
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e.g. by a linker script or another object file.) */
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.weak __stack
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.weak FUNCTION (hardware_init_hook)
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