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Provide exec_linux_setregs() to override exec_setregs().

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Linux initializes %gs to 0.  Mimic this behavior.

Submitted by:	 Christian Zander <zander@minion.de>
Reviewed by:	 jake
Approved by:	 re
This commit is contained in:
Matthew N. Dodd 2003-05-11 21:51:11 +00:00
parent 6843449a02
commit 598d45be84
1 changed files with 21 additions and 2 deletions
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23
sys/i386/linux/linux_sysvec.c
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@ -111,6 +111,8 @@ static void linux_prepsyscall(struct trapframe *tf, int *args, u_int *code,
caddr_t *params);
static void linux_sendsig(sig_t catcher, int sig, sigset_t *mask,
u_long code);
static void exec_linux_setregs(struct thread *td, u_long entry,
u_long stack, u_long ps_strings);
/*
* Linux syscalls return negative errno's, we do positive and map them
@ -805,6 +807,23 @@ exec_linux_imgact_try(struct image_params *imgp)
return(error);
}
/*
* exec_setregs may initialize some registers differently than Linux
* does, thus potentially confusing Linux binaries. If necessary, we
* override the exec_setregs default(s) here.
*/
static void
exec_linux_setregs(struct thread *td, u_long entry,
u_long stack, u_long ps_strings)
{
struct pcb *pcb = td->td_pcb;
exec_setregs(td, entry, stack, ps_strings);
/* Linux sets %gs to 0, we default to _udatasel */
pcb->pcb_gs = 0; load_gs(0);
}
struct sysentvec linux_sysvec = {
LINUX_SYS_MAXSYSCALL,
linux_sysent,
@ -830,7 +849,7 @@ struct sysentvec linux_sysvec = {
PS_STRINGS,
VM_PROT_ALL,
exec_copyout_strings,
exec_setregs
exec_linux_setregs
};
struct sysentvec elf_linux_sysvec = {
@ -858,7 +877,7 @@ struct sysentvec elf_linux_sysvec = {
PS_STRINGS,
VM_PROT_ALL,
exec_copyout_strings,
exec_setregs
exec_linux_setregs
};
static Elf32_Brandinfo linux_brand = {