--- /dev/null
+/*
+ * Copyright (c) 2011 ARM Ltd
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the company may not be used to endorse or promote
+ * products derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LIBGLOSS_ARM_H
+#define _LIBGLOSS_ARM_H
+
+/* __thumb2__ stands for thumb on armva7(A/R/M/EM) architectures,
+ __ARM_ARCH_6M__ stands for armv6-M(thumb only) architecture,
+ __ARM_ARCH_7M__ stands for armv7-M(thumb only) architecture.
+ __ARM_ARCH_7EM__ stands for armv7e-M(thumb only) architecture.
+ There are some macro combinations used many times in libgloss/arm,
+ like (__thumb2__ || (__thumb__ && __ARM_ARCH_6M__)), so factor
+ it out and use THUMB_V7_V6M instead, which stands for thumb on
+ v6-m/v7 arch as the combination does. */
+#if defined(__thumb2__) || (defined(__thumb__) && defined(__ARM_ARCH_6M__))
+# define THUMB_V7_V6M
+#endif
+
+/* The (__ARM_ARCH_7EM__ || __ARM_ARCH_7M__ || __ARM_ARCH_6M__) combination
+ stands for cortex-M profile architectures, which don't support ARM state.
+ Factor it out and use THUMB_V7M_V6M instead. */
+#if defined(__ARM_ARCH_7M__) \
+ || defined(__ARM_ARCH_7EM__) \
+ || defined(__ARM_ARCH_6M__)
+# define THUMB_V7M_V6M
+#endif
+
+#endif /* _LIBGLOSS_ARM_H */
#include "newlib.h"
+#include "arm.h"
#include "swi.h"
/* ANSI concatenation macros. */
/* .text is used instead of .section .text so it works with arm-aout too. */
.text
-#if defined(__thumb2__)
.syntax unified
+#ifdef THUMB_V7_V6M
.thumb
.macro FUNC_START name
.global \name
/* Issue Demon SWI to read stack info */
swi SWI_GetEnv /* Returns command line in r0 */
mov sp,r1 /* and the highest memory address in r1 */
- ldr sl, .LC2 /* stack limit is at end of data */
- add sl, sl, #256 /* allow slop for stack overflow handling */
- /* and small frames */
+
+ /* stack limit is at end of data */
+ /* allow slop for stack overflow handling and small frames */
+#ifdef __ARM_ARCH_6M__
+ ldr r0, .LC2
+ adds r0, #128
+ adds r0, #128
+ mov sl, r0
+#else
+ ldr sl, .LC2
+ add sl, sl, #256
+#endif
#else
#ifdef ARM_RDI_MONITOR
/* Issue Angel SWI to read stack info */
- mov r0, #AngelSWI_Reason_HeapInfo
+ movs r0, #AngelSWI_Reason_HeapInfo
adr r1, .LC0 /* point at ptr to 4 words to receive data */
-#if defined(__thumb2__)
+#ifdef THUMB_V7M_V6M
bkpt AngelSWI
+#elif defined(__thumb2__)
+ /* We are in thumb mode for startup on armv7 architectures. */
+ AngelSWIAsm AngelSWI
#else
- /* We are always in ARM mode for startup */
+ /* We are always in ARM mode for startup on pre armv7 archs. */
AngelSWIAsm AngelSWI_ARM
#endif
ldr r0, .LC0 /* point at values read */
- ldr sp, [r0, #8]
- ldr sl, [r0, #12]
- add sl, sl, #256 /* allow slop for stack overflow handling */
- /* and small frames */
+ ldr r1, [r0, #8]
+ ldr r2, [r0, #12]
+ /* We skip setting sp/sl if 0 returned from semihosting.
+ - According to semihosting docs, if 0 returned from semihosting,
+ the system was unable to calculate the real value, so it's ok
+ to skip setting sp/sl to 0 here.
+ - Considering M-profile processors, We might want to initialize
+ sp by the first entry of vector table and return 0 to SYS_HEAPINFO
+ semihosting call, which will be skipped here. */
+ cmp r1, #0
+ beq .LC26
+ mov sp, r1
+.LC26:
+ cmp r2, #0
+ beq .LC27
+ /* allow slop for stack overflow handling and small frames */
+#ifdef __ARM_ARCH_6M__
+ adds r2, #128
+ adds r2, #128
+ mov sl, r2
+#else
+ add sl, r2, #256
+#endif
+.LC27:
#else
/* Set up the stack pointer to a fixed value */
/* Changes by toralf:
#ifdef __thumb2__
it eq
#endif
+#ifdef __ARM_ARCH_6M__
+ bne .LC28
+ ldr r3, .LC0
+.LC28:
+#else
ldreq r3, .LC0
+#endif
/* Note: This 'mov' is essential when starting in User, and ensures we
always get *some* sp value for the initial mode, even if we
have somehow missed it below (in which case it gets the same
value as FIQ - not ideal, but better than nothing.) */
mov sp, r3
-#ifdef __thumb2__
+#ifdef THUMB_V7_V6M
/* XXX Fill in stack assignments for interrupt modes. */
#else
mrs r2, CPSR
this default 64k is enough for the program being executed.
However, it ensures that this simple crt0 world will not
immediately cause an overflow event: */
+#ifdef __ARM_ARCH_6M__
+ movs r2, #64
+ lsls r2, r2, #10
+ subs r2, r3, r2
+ mov sl, r2
+#else
sub sl, r3, #64 << 10 /* Still assumes 256bytes below sl */
#endif
#endif
+#endif
/* Zero the memory in the .bss section. */
- mov a2, #0 /* Second arg: fill value */
+ movs a2, #0 /* Second arg: fill value */
mov fp, a2 /* Null frame pointer */
mov r7, a2 /* Null frame pointer for Thumb */
ldr a1, .LC1 /* First arg: start of memory block */
ldr a3, .LC2
- sub a3, a3, a1 /* Third arg: length of block */
+ subs a3, a3, a1 /* Third arg: length of block */
-#if defined(__thumb__) && !defined(__thumb2__)
+#if defined(__thumb__) && !defined(THUMB_V7_V6M)
/* Enter Thumb mode.... */
add a4, pc, #1 /* Get the address of the Thumb block */
bx a4 /* Go there and start Thumb decoding */
#endif
.LC25:
- mov r0, #0 /* no arguments */
- mov r1, #0 /* no argv either */
+ movs r0, #0 /* no arguments */
+ movs r1, #0 /* no argv either */
#else
/* Need to set up standard file handles */
bl FUNCTION (initialise_monitor_handles)
swi SWI_GetEnv /* sets r0 to point to the command line */
mov r1, r0
#else
- mov r0, #AngelSWI_Reason_GetCmdLine
+ movs r0, #AngelSWI_Reason_GetCmdLine
adr r1, .LC30 /* Space for command line */
AngelSWIAsm AngelSWI
ldr r1, .LC30
#endif
/* Parse string at r1 */
- mov r0, #0 /* count of arguments so far */
+ movs r0, #0 /* count of arguments so far */
/* Push a NULL argument onto the end of the list. */
#ifdef __thumb__
push {r0}
/* Skip leading blanks */
#ifdef __thumb__
ldrb r3, [r1]
- add r1, #1
+ adds r1, #1
#else
ldrb r3, [r1], #1
#endif
b .LC22
.LC21:
- mov r2, #' ' /* terminator type */
- sub r1, r1, #1 /* adjust back to point at start char */
+ movs r2, #' ' /* terminator type */
+ subs r1, r1, #1 /* adjust back to point at start char */
.LC22:
#else
cmpne r3, #'\''
#else
stmfd sp!, {r1}
#endif
- add r0, r0, #1
+ adds r0, r0, #1
.LC11:
#ifdef __thumb__
ldrb r3, [r1]
- add r1, #1
+ adds r1, #1
#else
ldrb r3, [r1], #1
#endif
beq .LC12
cmp r2, r3 /* reached terminator? */
bne .LC11
- mov r2, #0
- sub r3, r1, #1
+ movs r2, #0
+ subs r3, r1, #1
strb r2, [r3] /* terminate the arg string */
b .LC10
/* We've now got the stacked args in order reverse the */
#ifdef __thumb__
mov r2, r0
- lsl r2, #2
+ lsls r2, #2
add r2, sp
mov r3, sp
.LC15: cmp r2, r3
bls .LC14
- sub r2, #4
+ subs r2, #4
ldr r4, [r2]
ldr r5, [r3]
str r5, [r2]
str r4, [r3]
- add r3, #4
+ adds r3, #4
b .LC15
.LC14:
/* Ensure doubleword stack alignment. */
mov r4, sp
- mov r5, #7
- bic r4, r5
+ movs r5, #7
+ bics r4, r5
mov sp, r4
#else
add r2, sp, r0, LSL #2 /* End of args */
bl FUNCTION (exit) /* Should not return. */
-#if defined(__thumb__) && !defined(__thumb2__)
+#if defined(__thumb__) && !defined(THUMB_V7_V6M)
/* Come out of Thumb mode. This code should be redundant. */
mov a4, pc
+#include "arm.h"
.file "crt0.S"
#endif
.text
+ .syntax unified
/* Setup the assembly entry point. */
-#ifdef __thumb2__
+#ifdef THUMB_V7_V6M
.macro FUNC_START name
.global \name
.thumb_func
\name:
.endm
- .syntax unified
.thumb
#else
.macro FUNC_START name
#endif
FUNC_START SYM_NAME(start)
FUNC_START SYM_NAME(_start)
+ /* Unnecessary to set fp for v6-m/v7-m, which don't support
+ ARM state. */
+#ifndef THUMB_V7M_V6M
mov fp, #0 /* Null frame pointer. */
- mov r7, #0 /* Null frame pointer for Thumb. */
+#endif
+ movs r7, #0 /* Null frame pointer for Thumb. */
/* Enable interrupts for gdb debugging. */
-#ifdef __thumb2__
+#ifdef THUMB_V7_V6M
cpsie if
#else
mrs r0, cpsr
msr cpsr, r0
#endif
- mov a2, #0 /* Second arg: fill value. */
+ movs a2, #0 /* Second arg: fill value. */
ldr a1, .LC1 /* First arg: start of memory block. */
ldr a3, .LC2
- sub a3, a3, a1 /* Third arg: length of block. */
+ subs a3, a3, a1 /* Third arg: length of block. */
#ifdef GCRT0
/* Zero out the bss without using memset.
/* Nothing to left to clear. */
#endif
-#if defined(__thumb__) && !defined(__thumb2__) /* Enter Thumb mode. */
+#if defined(__thumb__) && !defined(THUMB_V7_V6M)
+ /* Enter Thumb mode. */
add a4, pc, #1 /* Get the address of the Thumb block. */
bx a4 /* Go there and start Thumb decoding. */
bl SYM_NAME(memset)
#endif
bl SYM_NAME(__get_memtop)
- sub r0, r0, #32
+ subs r0, r0, #32
mov sp, r0
#ifdef __USES_INITFINI__
bl SYM_NAME (_init)
#endif
- mov a1, #0
+ movs a1, #0
ldr a2, .LC3
mov a3, a2
bl SYM_NAME(main)
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