040362e379
. make exec() callers (i.e. vfs and rs) determine the memory layout by explicitly reserving regions using mmap() calls on behalf of the exec()ing process, i.e. handling all of the exec logic, thereby eliminating all special exec() knowledge from VM. . the new procedure is: clear the exec()ing process first, then call third-party mmap()s to reserve memory, then copy the executable file section contents in, all using callbacks tailored to the caller's way of starting an executable . i.e. no more explicit EXEC_NEWMEM-style calls in PM or VM as with rigid 2-section arguments . this naturally allows generalizing exec() by simply loading all ELF sections . drop/merge of lots of duplicate exec() code into libexec . not copying the code sections to vfs and into the executable again is a measurable performance improvement (about 3.3% faster for 'make' in src/servers/)
149 lines
3.2 KiB
C
149 lines
3.2 KiB
C
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#define _SYSTEM 1
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/const.h>
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#include <minix/ds.h>
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#include <minix/endpoint.h>
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#include <minix/keymap.h>
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#include <minix/minlib.h>
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#include <minix/type.h>
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#include <minix/ipc.h>
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#include <minix/sysutil.h>
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#include <minix/syslib.h>
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#include <minix/bitmap.h>
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#include <errno.h>
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#include <assert.h>
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#include <env.h>
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#include "glo.h"
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#include "proto.h"
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#include "util.h"
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#include "sanitycheck.h"
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void free_proc(struct vmproc *vmp)
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{
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map_free_proc(vmp);
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vmp->vm_heap = NULL;
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if(vmp->vm_flags & VMF_HASPT) {
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vmp->vm_flags &= ~VMF_HASPT;
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pt_free(&vmp->vm_pt);
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}
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region_init(&vmp->vm_regions_avl);
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vmp->vm_region_top = 0;
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#if VMSTATS
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vmp->vm_bytecopies = 0;
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#endif
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}
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void clear_proc(struct vmproc *vmp)
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{
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region_init(&vmp->vm_regions_avl);
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vmp->vm_region_top = 0;
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vmp->vm_callback = NULL; /* No pending vfs callback. */
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vmp->vm_flags = 0; /* Clear INUSE, so slot is free. */
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vmp->vm_heap = NULL;
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vmp->vm_yielded = 0;
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#if VMSTATS
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vmp->vm_bytecopies = 0;
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#endif
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}
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/*===========================================================================*
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* do_exit *
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*===========================================================================*/
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int do_exit(message *msg)
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{
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int proc;
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struct vmproc *vmp;
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SANITYCHECK(SCL_FUNCTIONS);
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if(vm_isokendpt(msg->VME_ENDPOINT, &proc) != OK) {
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printf("VM: bogus endpoint VM_EXIT %d\n", msg->VME_ENDPOINT);
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return EINVAL;
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}
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vmp = &vmproc[proc];
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if(!(vmp->vm_flags & VMF_EXITING)) {
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printf("VM: unannounced VM_EXIT %d\n", msg->VME_ENDPOINT);
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return EINVAL;
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}
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if(vmp->vm_flags & VMF_HAS_DMA) {
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release_dma(vmp);
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} else if(vmp->vm_flags & VMF_HASPT) {
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/* Free pagetable and pages allocated by pt code. */
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SANITYCHECK(SCL_DETAIL);
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free_proc(vmp);
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SANITYCHECK(SCL_DETAIL);
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} else {
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/* Free the data and stack segments. */
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free_mem(vmp->vm_arch.vm_seg[D].mem_phys,
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vmp->vm_arch.vm_seg[S].mem_vir +
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vmp->vm_arch.vm_seg[S].mem_len -
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vmp->vm_arch.vm_seg[D].mem_vir);
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}
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SANITYCHECK(SCL_DETAIL);
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/* Reset process slot fields. */
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clear_proc(vmp);
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SANITYCHECK(SCL_FUNCTIONS);
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return OK;
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}
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/*===========================================================================*
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* do_willexit *
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*===========================================================================*/
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int do_willexit(message *msg)
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{
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int proc;
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struct vmproc *vmp;
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if(vm_isokendpt(msg->VMWE_ENDPOINT, &proc) != OK) {
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printf("VM: bogus endpoint VM_EXITING %d\n",
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msg->VMWE_ENDPOINT);
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return EINVAL;
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}
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vmp = &vmproc[proc];
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vmp->vm_flags |= VMF_EXITING;
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return OK;
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}
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int do_procctl(message *msg)
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{
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endpoint_t proc;
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struct vmproc *vmp;
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if(vm_isokendpt(msg->VMPCTL_WHO, &proc) != OK) {
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printf("VM: bogus endpoint VM_PROCCTL %d\n",
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msg->VMPCTL_WHO);
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return EINVAL;
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}
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vmp = &vmproc[proc];
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switch(msg->VMPCTL_PARAM) {
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case VMPPARAM_CLEAR:
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if(msg->m_source != RS_PROC_NR
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&& msg->m_source != VFS_PROC_NR)
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return EPERM;
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free_proc(vmp);
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pt_new(&vmp->vm_pt);
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vmp->vm_flags |= VMF_HASPT;
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pt_bind(&vmp->vm_pt, vmp);
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regular_segs(vmp);
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return OK;
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default:
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return EINVAL;
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}
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return OK;
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}
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