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/)
61 lines
1.4 KiB
C
61 lines
1.4 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 <sys/signal.h>
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#include <errno.h>
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#include <env.h>
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#include "glo.h"
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#include "vm.h"
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#include "proto.h"
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#include "util.h"
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#define DATA_CHANGED 1 /* flag value when data segment size changed */
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#define STACK_CHANGED 2 /* flag value when stack size changed */
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/*===========================================================================*
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* do_push_sig *
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*===========================================================================*/
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int do_push_sig(message *msg)
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{
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int r, n;
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endpoint_t ep;
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vir_bytes sp;
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struct vmproc *vmp;
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ep = msg->VMPS_ENDPOINT;
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if((r=vm_isokendpt(ep, &n)) != OK) {
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printf("VM: bogus endpoint %d from %d\n", ep, msg->m_source);
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return r;
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}
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vmp = &vmproc[n];
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if ((r=get_stack_ptr(ep, &sp)) != OK)
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panic("couldn't get new stack pointer (for sig): %d", r);
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/* Save old SP for caller */
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msg->VMPS_OLD_SP = (char *) sp;
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/* Make room for the sigcontext and sigframe struct. */
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sp -= sizeof(struct sigcontext)
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+ 3 * sizeof(char *) + 2 * sizeof(int);
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return OK;
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}
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