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Move a MD 32 bit binary support routine into the MD areas. exec_setregs

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is highly MD in an emulation environment since it operates on the host
environment.  Although the setregs functions are really for exec support
rather than signals, they deal with the same sorts of context and include
files.  So I put it there rather than create yet another file.
This commit is contained in:
Peter Wemm 2003-11-08 07:43:44 +00:00
parent b0211d5445
commit 4cd2d525e3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=122303
3 changed files with 43 additions and 45 deletions
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41
sys/amd64/ia32/ia32_signal.c
View File

@ -558,3 +558,44 @@ freebsd32_sigreturn(td, uap)
PROC_UNLOCK(p);
return (EJUSTRETURN);
}
/*
* Clear registers on exec
*/
void
ia32_setregs(td, entry, stack, ps_strings)
struct thread *td;
u_long entry;
u_long stack;
u_long ps_strings;
{
struct trapframe *regs = td->td_frame;
struct pcb *pcb = td->td_pcb;
wrmsr(MSR_FSBASE, 0);
wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */
pcb->pcb_fsbase = 0;
pcb->pcb_gsbase = 0;
load_ds(_udatasel);
load_es(_udatasel);
load_fs(_udatasel);
load_gs(_udatasel);
pcb->pcb_ds = _udatasel;
pcb->pcb_es = _udatasel;
pcb->pcb_fs = _udatasel;
pcb->pcb_gs = _udatasel;
bzero((char *)regs, sizeof(struct trapframe));
regs->tf_rip = entry;
regs->tf_rsp = stack;
regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
regs->tf_ss = _udatasel;
regs->tf_cs = _ucode32sel;
regs->tf_rbx = ps_strings;
load_cr0(rcr0() | CR0_MP | CR0_TS);
fpstate_drop(td);
/* Return via doreti so that we can change to a different %cs */
pcb->pcb_flags |= PCB_FULLCTX;
td->td_retval[1] = 0;
}

2
sys/compat/ia32/ia32_signal.h
View File

@ -160,3 +160,5 @@ extern char freebsd4_ia32_sigcode[];
extern int sz_ia32_sigcode;
extern int sz_freebsd4_ia32_sigcode;
extern void ia32_sendsig(sig_t, int, sigset_t *, u_long);
extern void ia32_setregs(struct thread *td, u_long entry, u_long stack,
u_long ps_strings);

45
sys/compat/ia32/ia32_sysvec.c
View File

@ -86,8 +86,6 @@ CTASSERT(sizeof(struct ia32_sigframe4) == 408);
#endif
static register_t *ia32_copyout_strings(struct image_params *imgp);
static void ia32_setregs(struct thread *td, u_long entry, u_long stack,
u_long ps_strings);
static void ia32_fixlimits(struct image_params *imgp);
extern struct sysent freebsd32_sysent[];
@ -244,49 +242,6 @@ ia32_copyout_strings(struct image_params *imgp)
return ((register_t *)stack_base);
}
/*
* Clear registers on exec
* XXX backend MD
*/
extern int _ucode32sel, _udatasel;
void
ia32_setregs(td, entry, stack, ps_strings)
struct thread *td;
u_long entry;
u_long stack;
u_long ps_strings;
{
struct trapframe *regs = td->td_frame;
struct pcb *pcb = td->td_pcb;
wrmsr(MSR_FSBASE, 0);
wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */
pcb->pcb_fsbase = 0;
pcb->pcb_gsbase = 0;
load_ds(_udatasel);
load_es(_udatasel);
load_fs(_udatasel);
load_gs(_udatasel);
pcb->pcb_ds = _udatasel;
pcb->pcb_es = _udatasel;
pcb->pcb_fs = _udatasel;
pcb->pcb_gs = _udatasel;
bzero((char *)regs, sizeof(struct trapframe));
regs->tf_rip = entry;
regs->tf_rsp = stack;
regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
regs->tf_ss = _udatasel;
regs->tf_cs = _ucode32sel;
regs->tf_rbx = ps_strings;
load_cr0(rcr0() | CR0_MP | CR0_TS);
fpstate_drop(td);
/* Return via doreti so that we can change to a different %cs */
pcb->pcb_flags |= PCB_FULLCTX;
td->td_retval[1] = 0;
}
static u_long ia32_maxdsiz = IA32_MAXDSIZ;
SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, "");
static u_long ia32_maxssiz = IA32_MAXSSIZ;