cfd3379bb1
* Removed startup code patches in lib/csu regarding kernel to userland
ABI.
* Aligned stack layout on NetBSD stack layout.
* Generate valid stack pointers instead of offsets by taking into account
_minix_kerninfo->kinfo->user_sp.
* Refactored stack generation, by moving part of execve in two
functions {minix_stack_params(), minix_stack_fill()} and using them
in execve(), rs and vm.
* Changed load offset of rtld (ld.so) to:
execi.args.stack_high - execi.args.stack_size - 0xa00000
which is 10MB below the main executable stack.
Change-Id: I839daf3de43321cded44105634102d419cb36cec
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
/* execve() - basic program execution call */
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#include <sys/cdefs.h>
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#include "namespace.h"
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#include <lib.h>
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#include <unistd.h>
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#include <string.h>
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#include <stddef.h>
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#include <minix/param.h>
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#include <sys/exec_elf.h>
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#include <sys/exec.h>
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#ifdef __weak_alias
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__weak_alias(execve, _execve)
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#endif
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int execve(const char *path, char * const *argv, char * const *envp)
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{
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message m;
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size_t frame_size = 0; /* Size of the new initial stack. */
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int argc = 0; /* Argument count. */
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int envc = 0; /* Environment count */
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char overflow = 0; /* No overflow yet. */
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char *frame;
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struct ps_strings *psp;
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int vsp = 0; /* (virtual) Stack pointer in new address space. */
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minix_stack_params(path, argv, envp, &frame_size, &overflow,
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&argc, &envc);
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/* The party is off if there is an overflow. */
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if (overflow) {
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errno = E2BIG;
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return -1;
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}
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/* Allocate space for the stack frame. */
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if ((frame = (char *) sbrk(frame_size)) == (char *) -1) {
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errno = E2BIG;
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return -1;
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}
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minix_stack_fill(path, argc, argv, envc, envp, frame_size, frame,
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&vsp, &psp);
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/* Clear unused message fields */
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memset(&m, 0, sizeof(m));
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/* We can finally make the system call. */
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m.m1_i1 = strlen(path) + 1;
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m.m1_i2 = frame_size;
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m.m1_p1 = (char *) __UNCONST(path);
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m.m1_p2 = frame;
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m.m1_p4 = (char *)(vsp + ((char *)psp - frame));
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(void) _syscall(PM_PROC_NR, EXEC, &m);
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/* Failure, return the memory used for the frame and exit. */
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(void) sbrk(-frame_size);
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return -1;
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}
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