minix/lib/libexec/exec_general.c
Lionel Sambuc cfd3379bb1 Removing CSU patches
* 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
2014-02-18 11:25:02 +01:00

91 lines
2.1 KiB
C

#define _SYSTEM 1
#include <minix/type.h>
#include <minix/const.h>
#include <sys/param.h>
#include <assert.h>
#include <unistd.h>
#include <errno.h>
#include <libexec.h>
#include <string.h>
#include <assert.h>
#include <minix/ipc.h>
#include <minix/com.h>
#include <minix/callnr.h>
#include <minix/vm.h>
#include <minix/ipc.h>
#include <minix/syslib.h>
#include <sys/mman.h>
#include <machine/elf.h>
int libexec_alloc_mmap_prealloc_junk(struct exec_info *execi, vir_bytes vaddr, size_t len)
{
if(minix_mmap_for(execi->proc_e, (void *) vaddr, len,
PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_ANON|MAP_PREALLOC|MAP_UNINITIALIZED|MAP_FIXED, -1, 0) == MAP_FAILED) {
return ENOMEM;
}
return OK;
}
int libexec_alloc_mmap_prealloc_cleared(struct exec_info *execi, vir_bytes vaddr, size_t len)
{
if(minix_mmap_for(execi->proc_e, (void *) vaddr, len,
PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_ANON|MAP_PREALLOC|MAP_FIXED, -1, 0) == MAP_FAILED) {
return ENOMEM;
}
return OK;
}
int libexec_alloc_mmap_ondemand(struct exec_info *execi, vir_bytes vaddr, size_t len)
{
if(minix_mmap_for(execi->proc_e, (void *) vaddr, len,
PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_ANON|MAP_FIXED, -1, 0) == MAP_FAILED) {
return ENOMEM;
}
return OK;
}
int libexec_clearproc_vm_procctl(struct exec_info *execi)
{
return vm_procctl(execi->proc_e, VMPPARAM_CLEAR);
}
int libexec_clear_sys_memset(struct exec_info *execi, vir_bytes vaddr, size_t len)
{
return sys_memset(execi->proc_e, 0, vaddr, len);
}
int libexec_copy_memcpy(struct exec_info *execi,
off_t off, vir_bytes vaddr, size_t len)
{
assert(off + len <= execi->hdr_len);
memcpy((char *) vaddr, (char *) execi->hdr + off, len);
return OK;
}
int libexec_clear_memset(struct exec_info *execi, vir_bytes vaddr, size_t len)
{
memset((char *) vaddr, 0, len);
return OK;
}
int libexec_pm_newexec(endpoint_t proc_e, struct exec_info *e)
{
int r;
message m;
m.m_type = PM_NEWEXEC;
m.EXC_NM_PROC = proc_e;
m.EXC_NM_PTR = (char *)e;
if ((r = sendrec(PM_PROC_NR, &m)) != OK) return(r);
e->allow_setuid = !!(m.m1_i2 & EXC_NM_RF_ALLOW_SETUID);
return(m.m_type);
}