147 lines
4.5 KiB
ArmAsm
147 lines
4.5 KiB
ArmAsm
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/****************************************************************************
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* libs/libc/machine/renesas/rx/gnu/arm_setjmp.S
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Symbols
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****************************************************************************/
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.text
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.global _setjmp
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.global _longjmp
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.file "setjmp.S"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: setjmp
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*
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* Description:
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* Given the pointer to a register save area (in R1), save the state of the
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* all callee-saved registers
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*
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* C Function Prototype:
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* int setjmp(jmp_buf env);
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*
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* Input Parameters:
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* env - A pointer to the register save area in which to save the floating point
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* registers and core registers. Since setjmp() can not be inlined, we
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* only need to save the ABI-specified callee-saved registers.
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*
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* Returned Value:
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* 0 setjmp called directly
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* non-0 we justed returned from a longjmp()
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*
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****************************************************************************/
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.type _setjmp, function
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_setjmp:
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/* save Stack Pointer */
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mov.l r0, [r1]
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/* Store callee-saved registers R6-R13 */
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mov.l r6, 0x4[r1]
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mov.l r7, 0x8[r1]
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mov.l r8, 0xc[r1]
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mov.l r9, 0x10[r1]
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mov.l r10, 0x14[r1]
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mov.l r11, 0x18[r1]
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mov.l r12, 0x1c[r1]
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mov.l r13, 0x20[r1]
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/* get return address from stack */
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mov.l [r0], r2
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/* save return address */
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mov.l r2, 0x24[r1]
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/* return 0 */
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mov #0, r1
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rts
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.size _setjmp, .-_setjmp
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/****************************************************************************
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* Name: longjmp
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*
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* Description:
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* The longjmp() function used the information saved in env to transfer control
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* control back to the point where setjmp() was called and to restore ("rewind")
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* the stack to its state at the time of the setjmp() call. When control is
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* passed back to where setjmp() had been called, setjmp() will return with
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* 'val', the second parameter passed to longjmp().
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*
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* C Function Prototype:
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* void longjmp(jmp_buf env, int val);
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*
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* Input Parameters:
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* jmp_buf env
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* int val
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*
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* Returned Value:
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* This function does not return anything explicitly.
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*
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****************************************************************************/
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.type _longjmp, function
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_longjmp:
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/* check if r2 is zero */
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tst r2, r2
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/* set r2 to 1 if it was zero */
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stz #1, r2
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/* restore stack pointer */
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mov.l [r1], r0
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/* get the saved return address */
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mov.l 0x24[r1], r3
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/* set our return address */
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mov.l r3, [r0]
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/* restore callee-saved registers R6-R13 */
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mov.l 0x20[r1], r13
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mov.l 0x1c[r1], r12
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mov.l 0x18[r1], r11
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mov.l 0x14[r1], r10
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mov.l 0x10[r1], r9
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mov.l 0xc[r1], r8
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mov.l 0x8[r1], r7
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mov.l 0x4[r1], r6
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/* return val */
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mov.l r2, r1
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/* return */
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rts
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.size _longjmp, .-_longjmp
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.end
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