* arm/crt0.S: Support armv6-m processors in libgloss.
* arm/swi.h: Likewise. * arm/trap.S: Likewise. * arm/redboot-crt0.S: Likewise. * arm/linux-crt0.c: Likewise. * arm/arm.h: New.
This commit is contained in:
Nick Clifton
@@ -1,4 +1,5 @@
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#include "newlib.h"
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#include "arm.h"
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#include "swi.h"
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/* ANSI concatenation macros. */
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@@ -18,8 +19,8 @@
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/* .text is used instead of .section .text so it works with arm-aout too. */
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.text
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#if defined(__thumb2__)
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.syntax unified
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#ifdef THUMB_V7_V6M
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.thumb
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.macro FUNC_START name
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.global \name
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@@ -48,25 +49,57 @@
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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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ldr sl, .LC2 /* stack limit is at end of data */
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add sl, sl, #256 /* allow slop for stack overflow handling */
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/* 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 __ARM_ARCH_6M__
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ldr r0, .LC2
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adds r0, #128
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adds r0, #128
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mov sl, r0
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#else
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ldr sl, .LC2
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add sl, sl, #256
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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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mov r0, #AngelSWI_Reason_HeapInfo
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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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#if defined(__thumb2__)
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#ifdef THUMB_V7M_V6M
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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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AngelSWIAsm AngelSWI
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#else
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/* We are always in ARM mode for startup */
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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 sp, [r0, #8]
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ldr sl, [r0, #12]
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add sl, sl, #256 /* allow slop for stack overflow handling */
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/* and small frames */
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ldr r1, [r0, #8]
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ldr r2, [r0, #12]
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/* We skip setting sp/sl if 0 returned from semihosting.
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- According to semihosting docs, if 0 returned from semihosting,
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the system was unable to calculate the real value, so it's ok
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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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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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#ifdef __ARM_ARCH_6M__
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adds r2, #128
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adds r2, #128
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mov sl, r2
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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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/* Changes by toralf:
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@@ -85,13 +118,19 @@
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#ifdef __thumb2__
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it eq
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#endif
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#ifdef __ARM_ARCH_6M__
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bne .LC28
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ldr r3, .LC0
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.LC28:
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#else
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ldreq r3, .LC0
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#endif
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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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mov sp, r3
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#ifdef __thumb2__
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#ifdef THUMB_V7_V6M
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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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@@ -134,20 +173,27 @@
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this default 64k is enough for the program being executed.
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However, it ensures that this simple crt0 world will not
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immediately cause an overflow event: */
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#ifdef __ARM_ARCH_6M__
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movs r2, #64
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lsls r2, r2, #10
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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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#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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mov a2, #0 /* Second arg: fill value */
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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 a3, .LC2
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sub 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 defined(__thumb__) && !defined(__thumb2__)
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#if defined(__thumb__) && !defined(THUMB_V7_V6M)
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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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@@ -185,8 +231,8 @@ __change_mode:
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#endif
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.LC25:
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mov r0, #0 /* no arguments */
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mov 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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bl FUNCTION (initialise_monitor_handles)
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@@ -195,13 +241,13 @@ __change_mode:
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swi SWI_GetEnv /* sets r0 to point to the command line */
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mov r1, r0
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#else
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mov r0, #AngelSWI_Reason_GetCmdLine
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movs r0, #AngelSWI_Reason_GetCmdLine
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adr r1, .LC30 /* Space for command line */
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AngelSWIAsm AngelSWI
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ldr r1, .LC30
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#endif
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/* Parse string at r1 */
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mov r0, #0 /* count of arguments so far */
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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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@@ -212,7 +258,7 @@ __change_mode:
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/* Skip leading blanks */
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#ifdef __thumb__
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ldrb r3, [r1]
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add r1, #1
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adds r1, #1
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#else
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ldrb r3, [r1], #1
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#endif
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@@ -232,8 +278,8 @@ __change_mode:
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b .LC22
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.LC21:
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mov r2, #' ' /* terminator type */
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sub 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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@@ -248,11 +294,11 @@ __change_mode:
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#else
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stmfd sp!, {r1}
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#endif
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add r0, r0, #1
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adds r0, r0, #1
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.LC11:
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#ifdef __thumb__
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ldrb r3, [r1]
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add r1, #1
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adds r1, #1
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#else
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ldrb r3, [r1], #1
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#endif
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@@ -260,8 +306,8 @@ __change_mode:
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beq .LC12
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cmp r2, r3 /* reached terminator? */
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bne .LC11
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mov r2, #0
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sub r3, r1, #1
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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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b .LC10
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@@ -270,23 +316,23 @@ __change_mode:
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/* We've now got the stacked args in order reverse the */
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#ifdef __thumb__
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mov r2, r0
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lsl r2, #2
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lsls r2, #2
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add r2, sp
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mov r3, sp
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.LC15: cmp r2, r3
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bls .LC14
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sub r2, #4
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subs r2, #4
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ldr r4, [r2]
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ldr r5, [r3]
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str r5, [r2]
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str r4, [r3]
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add r3, #4
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adds r3, #4
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b .LC15
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.LC14:
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/* Ensure doubleword stack alignment. */
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mov r4, sp
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mov r5, #7
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bic r4, r5
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movs r5, #7
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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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@@ -319,7 +365,7 @@ __change_mode:
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bl FUNCTION (exit) /* Should not return. */
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#if defined(__thumb__) && !defined(__thumb2__)
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#if defined(__thumb__) && !defined(THUMB_V7_V6M)
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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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