minix/kernel/system/do_exec.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

58 lines
1.7 KiB
C

/* The kernel call implemented in this file:
* m_type: SYS_EXEC
*
* The parameters for this kernel call are:
* m1_i1: PR_ENDPT (process that did exec call)
* m1_p1: PR_STACK_PTR (new stack pointer)
* m1_p2: PR_NAME_PTR (pointer to program name)
* m1_p3: PR_IP_PTR (new instruction pointer)
*/
#include "kernel/system.h"
#include <string.h>
#include <minix/endpoint.h>
#if USE_EXEC
/*===========================================================================*
* do_exec *
*===========================================================================*/
int do_exec(struct proc * caller, message * m_ptr)
{
/* Handle sys_exec(). A process has done a successful EXEC. Patch it up. */
register struct proc *rp;
int proc_nr;
char name[PROC_NAME_LEN];
if(!isokendpt(m_ptr->PR_ENDPT, &proc_nr))
return EINVAL;
rp = proc_addr(proc_nr);
if(rp->p_misc_flags & MF_DELIVERMSG) {
rp->p_misc_flags &= ~MF_DELIVERMSG;
}
/* Save command name for debugging, ps(1) output, etc. */
if(data_copy(caller->p_endpoint, (vir_bytes) m_ptr->PR_NAME_PTR,
KERNEL, (vir_bytes) name,
(phys_bytes) sizeof(name) - 1) != OK)
strncpy(name, "<unset>", PROC_NAME_LEN);
name[sizeof(name)-1] = '\0';
/* Set process state. */
arch_proc_init(rp, (u32_t) m_ptr->PR_IP_PTR, (u32_t) m_ptr->PR_STACK_PTR,
(u32_t) m_ptr->PR_PS_STR_PTR, name);
/* No reply to EXEC call */
RTS_UNSET(rp, RTS_RECEIVING);
/* Mark fpu_regs contents as not significant, so fpu
* will be initialized, when it's used next time. */
rp->p_misc_flags &= ~MF_FPU_INITIALIZED;
/* force reloading FPU if the current process is the owner */
release_fpu(rp);
return(OK);
}
#endif /* USE_EXEC */