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Implement vfork() for the MIPS32 architecture

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5520 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2013-01-15 15:40:18 +00:00
parent 74a42b5f39
commit ee2be652aa
10 changed files with 565 additions and 4 deletions
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3
arch/arm/src/arm/vfork.S
View File

@ -105,6 +105,7 @@ vfork:
mov r0, sp /* Save the value of the stack on entry */
sub sp, sp, #VFORK_SIZEOF /* Allocate the structure on the stack */
/* CPU registers */
/* Save the volatile registers */
str r4, [sp, #VFORK_R4_OFFSET]
@ -121,6 +122,8 @@ vfork:
str r0, [sp, #VFORK_SP_OFFSET]
str lr, [sp, #VFORK_LR_OFFSET]
/* Floating point registers (not yet) */
/* Then, call up_vfork(), passing it a pointer to the stack structure */
mov r0, sp

3
arch/arm/src/armv7-m/vfork.S
View File

@ -108,6 +108,7 @@ vfork:
mov r0, sp /* Save the value of the stack on entry */
sub sp, sp, #VFORK_SIZEOF /* Allocate the structure on the stack */
/* CPU registers */
/* Save the volatile registers */
str r4, [sp, #VFORK_R4_OFFSET]
@ -124,6 +125,8 @@ vfork:
str r0, [sp, #VFORK_SP_OFFSET]
str lr, [sp, #VFORK_LR_OFFSET]
/* Floating point registers (not yet) */
/* Then, call up_vfork(), passing it a pointer to the stack structure */
mov r0, sp

2
arch/arm/src/common/up_vfork.c
View File

@ -208,7 +208,7 @@ pid_t up_vfork(const struct vfork_s *context)
svdbg("New stack base:%08x SP:%08x FP:%08x\n",
child->adj_stack_ptr, newsp, newfp);
/* Update the stack pointer, frame pointer, and voltile registers. When
/* Update the stack pointer, frame pointer, and volatile registers. When
* the child TCB was initialized, all of the values were set to zero.
* up_initial_state() altered a few values, but the return value in R0
* should be cleared to zero, providing the indication to the newly started

8
arch/arm/src/common/up_vfork.h
View File

@ -1,5 +1,5 @@
/****************************************************************************
* arch/arm/src/common/arm-vfork.h
* arch/arm/src/common/up_vfork.h
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
@ -53,6 +53,7 @@
#define VFORK_R8_OFFSET (4*4) /* Volatile register r8 */
#define VFORK_R9_OFFSET (5*4) /* Volatile register r9 */
#define VFORK_R10_OFFSET (6*4) /* Volatile register r10 */
#define VFORK_FP_OFFSET (7*4) /* Frame pointer */
#define VFORK_SP_OFFSET (8*4) /* Stack pointer*/
#define VFORK_LR_OFFSET (9*4) /* Return address*/
@ -66,6 +67,8 @@
#ifndef __ASSEMBLY__
struct vfork_s
{
/* CPU registers */
uint32_t r4; /* Volatile register r4 */
uint32_t r5; /* Volatile register r5 */
uint32_t r6; /* Volatile register r6 */
@ -73,9 +76,12 @@ struct vfork_s
uint32_t r8; /* Volatile register r8 */
uint32_t r9; /* Volatile register r9 */
uint32_t r10; /* Volatile register r10 */
uint32_t fp; /* Frame pointer */
uint32_t sp; /* Stack pointer*/
uint32_t lr; /* Return address*/
/* Floating point registers (not yet) */
};
#endif

1
arch/mips/Kconfig
View File

@ -22,6 +22,7 @@ endchoice
config ARCH_MIPS32
bool
default n
select ARCH_HAVE_VFORK
config ARCH_FAMILY
string

8
arch/mips/src/mips32/Kconfig
View File

@ -47,4 +47,12 @@ config MIPS32_TOOLCHAIN_PINGUINOL
endchoice
config MIPS32_FRAMEPOINTER
bool "ABI Uses Frame Pointer"
default n
depends on ARCH_HAVE_VFORK
---help---
Register r30 may be a frame pointer in some ABIs. Or may just be
saved register s8. It makes a difference for vfork handling.
endif

254
arch/mips/src/mips32/up_vfork.c Normal file
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@ -0,0 +1,254 @@
/****************************************************************************
* arch/mips/src/mips32/up_vfork.c
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/sched.h>
#include <nuttx/arch.h>
#include <arch/irq.h>
#include "up_vfork.h"
#include "os_internal.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef CONFIG_STACK_ALIGNMENT
# define CONFIG_STACK_ALIGNMENT 4
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_vfork
*
* Description:
* The vfork() function has the same effect as fork(), except that the
* behavior is undefined if the process created by vfork() either modifies
* any data other than a variable of type pid_t used to store the return
* value from vfork(), or returns from the function in which vfork() was
* called, or calls any other function before successfully calling _exit()
* or one of the exec family of functions.
*
* The overall sequence is:
*
* 1) User code calls vfork(). vfork() collects context information and
* transfers control up up_vfork().
* 2) up_vfork()and calls task_vforksetup().
* 3) task_vforksetup() allocates and configures the child task's TCB. This
* consists of:
* - Allocation of the child task's TCB.
* - Initialization of file descriptors and streams
* - Configuration of environment variables
* - Setup the intput parameters for the task.
* - Initialization of the TCB (including call to up_initial_state()
* 4) up_vfork() provides any additional operating context. up_vfork must:
* - Allocate and initialize the stack
* - Initialize special values in any CPU registers that were not
* already configured by up_initial_state()
* 5) up_vfork() then calls task_vforkstart()
* 6) task_vforkstart() then executes the child thread.
*
* task_vforkabort() may be called if an error occurs between steps 3 and 6.
*
* Input Paremeters:
* context - Caller context information saved by vfork()
*
* Return:
* Upon successful completion, vfork() returns 0 to the child process and
* returns the process ID of the child process to the parent process.
* Otherwise, -1 is returned to the parent, no child process is created,
* and errno is set to indicate the error.
*
****************************************************************************/
pid_t up_vfork(const struct vfork_s *context)
{
_TCB *parent = (FAR _TCB *)g_readytorun.head;
_TCB *child;
size_t stacksize;
uint32_t newsp;
#if CONFIG_MIPS32_FRAMEPOINTER
uint32_t newfp;
#endif
uint32_t stackutil;
int ret;
svdbg("s0:%08x s1:%08x s2:%08x s3:%08x s4:%08x\n",
context->s0, context->s1, context->s2, context->s3, context->s4);
#if CONFIG_MIPS32_FRAMEPOINTER
svdbg("s5:%08x s6:%08x s7:%08x\n",
context->s5, context->s6, context->s7);
#ifdef MIPS32_SAVE_GP
svdbg("fp:%08x sp:%08x ra:%08x gp:%08x\n",
context->fp, context->sp, context->ra, context->gp);
#else
svdbg("fp:%08x sp:%08x ra:%08x\n",
context->fp context->sp, context->ra);
#endif
#else
svdbg("s5:%08x s6:%08x s7:%08x s8:%08x\n",
context->s5, context->s6, context->s7, context->s8);
#ifdef MIPS32_SAVE_GP
svdbg("sp:%08x ra:%08x gp:%08x\n",
context->sp, context->ra, context->gp);
#else
svdbg("sp:%08x ra:%08x\n",
context->sp, context->ra);
#endif
#endif
/* Allocate and initialize a TCB for the child task. */
child = task_vforksetup((start_t)context->ra);
if (!child)
{
sdbg("task_vforksetup failed\n");
return (pid_t)ERROR;
}
svdbg("Parent=%p Child=%p\n", parent, child);
/* Get the size of the parent task's stack. Due to alignment operations,
* the adjusted stack size may be smaller than the stack size originally
* requrested.
*/
stacksize = parent->adj_stack_size + CONFIG_STACK_ALIGNMENT - 1;
/* Allocate the stack for the TCB */
ret = up_create_stack(child, stacksize);
if (ret != OK)
{
sdbg("up_create_stack failed: %d\n", ret);
task_vforkabort(child, -ret);
return (pid_t)ERROR;
}
/* How much of the parent's stack was utilized? The MIPS uses
* a push-down stack so that the current stack pointer should
* be lower than the initial, adjusted stack pointer. The
* stack usage should be the difference between those two.
*/
DEBUGASSERT((uint32_t)parent->adj_stack_ptr > context->sp);
stackutil = (uint32_t)parent->adj_stack_ptr - context->sp;
svdbg("stacksize:%d stackutil:%d\n", stacksize, stackutil);
/* Make some feeble effort to perserve the stack contents. This is
* feeble because the stack surely contains invalid pointers and other
* content that will not work in the child context. However, if the
* user follows all of the caveats of vfor() usage, even this feeble
* effort is overkill.
*/
newsp = (uint32_t)child->adj_stack_ptr - stackutil;
memcpy((void *)newsp, (const void *)context->sp, stackutil);
/* Was there a frame pointer in place before? */
#if CONFIG_MIPS32_FRAMEPOINTER
if (context->fp <= (uint32_t)parent->adj_stack_ptr &&
context->fp >= (uint32_t)parent->adj_stack_ptr - stacksize)
{
uint32_t frameutil = (uint32_t)parent->adj_stack_ptr - context->fp;
newfp = (uint32_t)child->adj_stack_ptr - frameutil;
}
else
{
newfp = context->fp;
}
svdbg("Old stack base:%08x SP:%08x FP:%08x\n",
parent->adj_stack_ptr, context->sp, context->fp);
svdbg("New stack base:%08x SP:%08x FP:%08x\n",
child->adj_stack_ptr, newsp, newfp);
#else
svdbg("Old stack base:%08x SP:%08x\n",
parent->adj_stack_ptr, context->sp);
svdbg("New stack base:%08x SP:%08x\n",
child->adj_stack_ptr, newsp);
#endif
/* Update the stack pointer, frame pointer, global pointer and saved
* registers. When the child TCB was initialized, all of the values
* were set to zero. up_initial_state() altered a few values, but the
* return value in v0 should be cleared to zero, providing the
* indication to the newly started child thread.
*/
child->xcp.regs[REG_S0] = context->s0; /* Saved register s0 */
child->xcp.regs[REG_S1] = context->s1; /* Saved register s1 */
child->xcp.regs[REG_S2] = context->s2; /* Saved register s2 */
child->xcp.regs[REG_S3] = context->s3; /* Volatile register s3 */
child->xcp.regs[REG_S4] = context->s4; /* Volatile register s4 */
child->xcp.regs[REG_S5] = context->s5; /* Volatile register s5 */
child->xcp.regs[REG_S6] = context->s6; /* Volatile register s6 */
child->xcp.regs[REG_S7] = context->s7; /* Volatile register s7 */
#if CONFIG_MIPS32_FRAMEPOINTER
child->xcp.regs[REG_FP] = newfp; /* Frame pointer */
#else
child->xcp.regs[REG_S8] = context->s8; /* Volatile register s8 */
#endif
child->xcp.regs[REG_SP] = newsp; /* Stack pointer */
#if MIPS32_SAVE_GP
child->xcp.regs[REG_GP] = newsp; /* Global pointer */
#endif
/* And, finally, start the child task. On a failure, task_vforkstart()
* will discard the TCB by calling task_vforkabort().
*/
return task_vforkstart(child);
}

132
arch/mips/src/mips32/up_vfork.h Normal file
View File

@ -0,0 +1,132 @@
/****************************************************************************
* arch/mips/src/mips/up_vfork.h
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE
* COPYRIGHT OWNER OR CONTRIBUTORS 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 __ARCH_MIPS_SRC_MIPS32_VFORK_H
#define __ARCH_MIPS_SRC_MIPS32_VFORK_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <arch/mips32/irq.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Register r30 may be a frame pointer in some ABIs. Or may just be saved
* register s8. It makes a difference for vfork handling.
*/
#undef VFORK_HAVE_FP
/* r0 zero Always has the value 0.
* r1 at Temporary generally used by assembler.
* r2-r3 v0-v1 Used for expression evaluations and to hold the integer and
* pointer type function return values.
* r4-r7 a0-a3 Used for passing arguments to functions; values are not
* preserved across function calls.
* r8-r15 t0-t7 Temporary registers used for expression evaluation; values
* are not preserved across function calls.
* r16-r23 s0-s7 Saved registers; values are preserved across function calls.
* r24-r25 t8-t9 Temporary registers used for expression evaluations; values
* are not preserved across function calls. When calling
* position independent functions r25 must contain the address
* of the called function.
* r26-r27 k0-k1 Used only by the operating system.
* r28 gp Global pointer and context pointer.
* r29 sp Stack pointer.
* r30 s8 Saved register (like s0-s7). If a frame pointer is used,
* then this is the frame pointer.
* r31 ra Return address.
*/
#define VFORK_S0_OFFSET (0*4) /* Saved register s0 */
#define VFORK_S1_OFFSET (1*4) /* Saved register s1 */
#define VFORK_S2_OFFSET (2*4) /* Saved register s2 */
#define VFORK_S3_OFFSET (3*4) /* Saved register s3 */
#define VFORK_S4_OFFSET (4*4) /* Saved register s4 */
#define VFORK_S5_OFFSET (5*4) /* Saved register s5 */
#define VFORK_S6_OFFSET (6*4) /* Saved register s6 */
#define VFORK_S7_OFFSET (7*4) /* Saved register s7 */
#ifdef CONFIG_MIPS32_FRAMEPOINTER
# define VFORK_FP_OFFSET (8*4) /* Frame pointer */
#else
# define VFORK_S8_OFFSET (8*4) /* Saved register s8 */
#endif
#define VFORK_SP_OFFSET (9*4) /* Stack pointer*/
#define VFORK_RA_OFFSET (10*4) /* Return address*/
#ifdef MIPS32_SAVE_GP
# define VFORK_GP_OFFSET (11*4) /* Global pointer */
# define VFORK_SIZEOF (12*4)
#else
# define VFORK_SIZEOF (11*4)
#endif
/****************************************************************************
* Public Types
****************************************************************************/
#ifndef __ASSEMBLY__
struct vfork_s
{
/* CPU registers */
uint32_t s0; /* Saved register s0 */
uint32_t s1; /* Saved register s1 */
uint32_t s2; /* Saved register s2 */
uint32_t s3; /* Saved register s3 */
uint32_t s4; /* Saved register s4 */
uint32_t s5; /* Saved register s5 */
uint32_t s6; /* Saved register s6 */
uint32_t s7; /* Saved register s7 */
#ifdef CONFIG_MIPS32_FRAMEPOINTER
uint32_t fp; /* Frame pointer */
#else
uint32_t s8; /* Saved register s8 */
#endif
uint32_t sp; /* Stack pointer*/
uint32_t ra; /* Return address*/
#ifdef MIPS32_SAVE_GP
uint32_t gp; /* Global pointer */
#endif
/* Floating point registers (not yet) */
};
#endif
#endif /* __ARCH_MIPS_SRC_MIPS32_VFORK_H */

154
arch/mips/src/mips32/vfork.S Normal file
View File

@ -0,0 +1,154 @@
/************************************************************************************
* arch/mips/src/mips32/vfork.S
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
************************************************************************************/
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#include "up_vfork.h"
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
/************************************************************************************
* Global Symbols
************************************************************************************/
.file "vfork.S"
.globl up_vfork
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: vfork
*
* Description:
* The vfork() function has the same effect as fork(), except that the behavior is
* undefined if the process created by vfork() either modifies any data other than
* a variable of type pid_t used to store the return value from vfork(), or returns
* from the function in which vfork() was called, or calls any other function before
* successfully calling _exit() or one of the exec family of functions.
*
* This thin layer implements vfork by simply calling up_vfork() with the vfork()
* context as an argument. The overall sequence is:
*
* 1) User code calls vfork(). vfork() collects context information and
* transfers control up up_vfork().
* 2) up_vfork()and calls task_vforksetup().
* 3) task_vforksetup() allocates and configures the child task's TCB. This
* consists of:
* - Allocation of the child task's TCB.
* - Initialization of file descriptors and streams
* - Configuration of environment variables
* - Setup the intput parameters for the task.
* - Initialization of the TCB (including call to up_initial_state()
* 4) up_vfork() provides any additional operating context. up_vfork must:
* - Allocate and initialize the stack
* - Initialize special values in any CPU registers that were not
* already configured by up_initial_state()
* 5) up_vfork() then calls task_vforkstart()
* 6) task_vforkstart() then executes the child thread.
*
* Input Paremeters:
* None
*
* Return:
* Upon successful completion, vfork() returns 0 to the child process and returns
* the process ID of the child process to the parent process. Otherwise, -1 is
* returned to the parent, no child process is created, and errno is set to
* indicate the error.
*
************************************************************************************/
.text
.align 2
.globl vfork
.type vfork, function
.set nomips16
.ent vfork
vfork:
/* Create a stack frame */
move $t0, $sp /* Save the value of the stack on entry */
addiu $sp, $sp, -VFORK_SIZEOF /* Allocate the structure on the stack */
/* CPU registers */
/* Save the saved registers */
sw $s0, VFORK_S0_OFFSET($sp)
sw $s1, VFORK_S1_OFFSET($sp)
sw $s2, VFORK_S2_OFFSET($sp)
sw $s3, VFORK_S3_OFFSET($sp)
sw $s4, VFORK_S4_OFFSET($sp)
sw $s5, VFORK_S5_OFFSET($sp)
sw $s6, VFORK_S6_OFFSET($sp)
sw $s7, VFORK_S7_OFFSET($sp)
#ifdef CONFIG_MIPS32_FRAMEPOINTER
sw $fp, VFORK_FP_OFFSET($sp)
#else
sw $s8, VFORK_S8_OFFSET($sp)
#endif
/* Save the global pointer, stack pointer, and return address */
sw $t0, VFORK_SP_OFFSET($sp)
sw $ra, VFORK_RA_OFFSET($sp)
#ifdef MIPS32_SAVE_GP
sw $gp, VFORK_GP_OFFSET($sp)
#endif
/* Floating point registers (not yet) */
/* Then, call up_vfork(), passing it a pointer to the stack structure */
move $a0, $sp
jal up_vfork
nop
/* Release the stack data and return the value returned by up_vfork */
lw $ra, VFORK_RA_OFFSET($sp)
addiu $sp, $sp, VFORK_SIZEOF
j $ra
.end vfork
.size vfork, .-vfork

4
arch/mips/src/pic32mx/Make.defs
View File

@ -39,14 +39,14 @@ HEAD_ASRC = pic32mx-head.S
# Common MIPS files
CMN_ASRCS = up_syscall0.S
CMN_ASRCS = up_syscall0.S vfork.S
CMN_CSRCS = up_allocateheap.c up_assert.c up_blocktask.c up_copystate.c \
up_createstack.c up_doirq.c up_exit.c up_idle.c up_initialize.c \
up_initialstate.c up_interruptcontext.c up_irq.c up_lowputs.c \
up_mdelay.c up_modifyreg8.c up_modifyreg16.c up_modifyreg32.c \
up_puts.c up_releasepending.c up_releasestack.c up_reprioritizertr.c \
up_schedulesigaction.c up_sigdeliver.c up_swint0.c up_udelay.c \
up_unblocktask.c up_usestack.c
up_unblocktask.c up_usestack.c up_vfork.c
# Configuration dependent common files