[POWERPC] 8xx: Move softemu8xx.c from arch/ppc
Previously, Soft_emulate_8xx was called with no implementation, resulting in build failures whenever building 8xx without math emulation. The implementation is copied from arch/ppc to resolve this issue. However, this sort of minimal emulation is not a very good idea other than for compatibility with existing userspaces, as it's less efficient than soft-float and can mislead users into believing they have soft-float. Thus, it is made a configurable option, off by default. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Родитель
c4e05bc57d
Коммит
5dd57a1308
|
@ -198,6 +198,17 @@ config MATH_EMULATION
|
|||
unit, which will allow programs that use floating-point
|
||||
instructions to run.
|
||||
|
||||
config 8XX_MINIMAL_FPEMU
|
||||
bool "Minimal math emulation for 8xx"
|
||||
depends on 8xx && !MATH_EMULATION
|
||||
help
|
||||
Older arch/ppc kernels still emulated a few floating point
|
||||
instructions such as load and store, even when full math
|
||||
emulation is disabled. Say "Y" here if you want to preserve
|
||||
this behavior.
|
||||
|
||||
It is recommended that you build a soft-float userspace instead.
|
||||
|
||||
config IOMMU_VMERGE
|
||||
bool "Enable IOMMU virtual merging"
|
||||
depends on PPC64
|
||||
|
|
|
@ -75,6 +75,8 @@ obj-$(CONFIG_KEXEC) += machine_kexec.o crash.o \
|
|||
obj-$(CONFIG_AUDIT) += audit.o
|
||||
obj64-$(CONFIG_AUDIT) += compat_audit.o
|
||||
|
||||
obj-$(CONFIG_8XX_MINIMAL_FPEMU) += softemu8xx.o
|
||||
|
||||
ifneq ($(CONFIG_PPC_INDIRECT_IO),y)
|
||||
obj-y += iomap.o
|
||||
endif
|
||||
|
|
|
@ -0,0 +1,202 @@
|
|||
/*
|
||||
* Software emulation of some PPC instructions for the 8xx core.
|
||||
*
|
||||
* Copyright (C) 1998 Dan Malek (dmalek@jlc.net)
|
||||
*
|
||||
* Software floating emuation for the MPC8xx processor. I did this mostly
|
||||
* because it was easier than trying to get the libraries compiled for
|
||||
* software floating point. The goal is still to get the libraries done,
|
||||
* but I lost patience and needed some hacks to at least get init and
|
||||
* shells running. The first problem is the setjmp/longjmp that save
|
||||
* and restore the floating point registers.
|
||||
*
|
||||
* For this emulation, our working registers are found on the register
|
||||
* save area.
|
||||
*/
|
||||
|
||||
#include <linux/errno.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/stddef.h>
|
||||
#include <linux/unistd.h>
|
||||
#include <linux/ptrace.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/user.h>
|
||||
#include <linux/a.out.h>
|
||||
#include <linux/interrupt.h>
|
||||
|
||||
#include <asm/pgtable.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <asm/system.h>
|
||||
#include <asm/io.h>
|
||||
|
||||
/* Eventually we may need a look-up table, but this works for now.
|
||||
*/
|
||||
#define LFS 48
|
||||
#define LFD 50
|
||||
#define LFDU 51
|
||||
#define STFD 54
|
||||
#define STFDU 55
|
||||
#define FMR 63
|
||||
|
||||
void print_8xx_pte(struct mm_struct *mm, unsigned long addr)
|
||||
{
|
||||
pgd_t *pgd;
|
||||
pmd_t *pmd;
|
||||
pte_t *pte;
|
||||
|
||||
printk(" pte @ 0x%8lx: ", addr);
|
||||
pgd = pgd_offset(mm, addr & PAGE_MASK);
|
||||
if (pgd) {
|
||||
pmd = pmd_offset(pud_offset(pgd, addr & PAGE_MASK),
|
||||
addr & PAGE_MASK);
|
||||
if (pmd && pmd_present(*pmd)) {
|
||||
pte = pte_offset_kernel(pmd, addr & PAGE_MASK);
|
||||
if (pte) {
|
||||
printk(" (0x%08lx)->(0x%08lx)->0x%08lx\n",
|
||||
(long)pgd, (long)pte, (long)pte_val(*pte));
|
||||
#define pp ((long)pte_val(*pte))
|
||||
printk(" RPN: %05lx PP: %lx SPS: %lx SH: %lx "
|
||||
"CI: %lx v: %lx\n",
|
||||
pp>>12, /* rpn */
|
||||
(pp>>10)&3, /* pp */
|
||||
(pp>>3)&1, /* small */
|
||||
(pp>>2)&1, /* shared */
|
||||
(pp>>1)&1, /* cache inhibit */
|
||||
pp&1 /* valid */
|
||||
);
|
||||
#undef pp
|
||||
}
|
||||
else {
|
||||
printk("no pte\n");
|
||||
}
|
||||
}
|
||||
else {
|
||||
printk("no pmd\n");
|
||||
}
|
||||
}
|
||||
else {
|
||||
printk("no pgd\n");
|
||||
}
|
||||
}
|
||||
|
||||
int get_8xx_pte(struct mm_struct *mm, unsigned long addr)
|
||||
{
|
||||
pgd_t *pgd;
|
||||
pmd_t *pmd;
|
||||
pte_t *pte;
|
||||
int retval = 0;
|
||||
|
||||
pgd = pgd_offset(mm, addr & PAGE_MASK);
|
||||
if (pgd) {
|
||||
pmd = pmd_offset(pud_offset(pgd, addr & PAGE_MASK),
|
||||
addr & PAGE_MASK);
|
||||
if (pmd && pmd_present(*pmd)) {
|
||||
pte = pte_offset_kernel(pmd, addr & PAGE_MASK);
|
||||
if (pte) {
|
||||
retval = (int)pte_val(*pte);
|
||||
}
|
||||
}
|
||||
}
|
||||
return retval;
|
||||
}
|
||||
|
||||
/*
|
||||
* We return 0 on success, 1 on unimplemented instruction, and EFAULT
|
||||
* if a load/store faulted.
|
||||
*/
|
||||
int Soft_emulate_8xx(struct pt_regs *regs)
|
||||
{
|
||||
u32 inst, instword;
|
||||
u32 flreg, idxreg, disp;
|
||||
int retval;
|
||||
s16 sdisp;
|
||||
u32 *ea, *ip;
|
||||
|
||||
retval = 0;
|
||||
|
||||
instword = *((u32 *)regs->nip);
|
||||
inst = instword >> 26;
|
||||
|
||||
flreg = (instword >> 21) & 0x1f;
|
||||
idxreg = (instword >> 16) & 0x1f;
|
||||
disp = instword & 0xffff;
|
||||
|
||||
ea = (u32 *)(regs->gpr[idxreg] + disp);
|
||||
ip = (u32 *)¤t->thread.fpr[flreg];
|
||||
|
||||
switch ( inst )
|
||||
{
|
||||
case LFD:
|
||||
/* this is a 16 bit quantity that is sign extended
|
||||
* so use a signed short here -- Cort
|
||||
*/
|
||||
sdisp = (instword & 0xffff);
|
||||
ea = (u32 *)(regs->gpr[idxreg] + sdisp);
|
||||
if (copy_from_user(ip, ea, sizeof(double)))
|
||||
retval = -EFAULT;
|
||||
break;
|
||||
|
||||
case LFDU:
|
||||
if (copy_from_user(ip, ea, sizeof(double)))
|
||||
retval = -EFAULT;
|
||||
else
|
||||
regs->gpr[idxreg] = (u32)ea;
|
||||
break;
|
||||
case LFS:
|
||||
sdisp = (instword & 0xffff);
|
||||
ea = (u32 *)(regs->gpr[idxreg] + sdisp);
|
||||
if (copy_from_user(ip, ea, sizeof(float)))
|
||||
retval = -EFAULT;
|
||||
break;
|
||||
case STFD:
|
||||
/* this is a 16 bit quantity that is sign extended
|
||||
* so use a signed short here -- Cort
|
||||
*/
|
||||
sdisp = (instword & 0xffff);
|
||||
ea = (u32 *)(regs->gpr[idxreg] + sdisp);
|
||||
if (copy_to_user(ea, ip, sizeof(double)))
|
||||
retval = -EFAULT;
|
||||
break;
|
||||
|
||||
case STFDU:
|
||||
if (copy_to_user(ea, ip, sizeof(double)))
|
||||
retval = -EFAULT;
|
||||
else
|
||||
regs->gpr[idxreg] = (u32)ea;
|
||||
break;
|
||||
case FMR:
|
||||
/* assume this is a fp move -- Cort */
|
||||
memcpy(ip, ¤t->thread.fpr[(instword>>11)&0x1f],
|
||||
sizeof(double));
|
||||
break;
|
||||
default:
|
||||
retval = 1;
|
||||
printk("Bad emulation %s/%d\n"
|
||||
" NIP: %08lx instruction: %08x opcode: %x "
|
||||
"A: %x B: %x C: %x code: %x rc: %x\n",
|
||||
current->comm,current->pid,
|
||||
regs->nip,
|
||||
instword,inst,
|
||||
(instword>>16)&0x1f,
|
||||
(instword>>11)&0x1f,
|
||||
(instword>>6)&0x1f,
|
||||
(instword>>1)&0x3ff,
|
||||
instword&1);
|
||||
{
|
||||
int pa;
|
||||
print_8xx_pte(current->mm,regs->nip);
|
||||
pa = get_8xx_pte(current->mm,regs->nip) & PAGE_MASK;
|
||||
pa |= (regs->nip & ~PAGE_MASK);
|
||||
pa = (unsigned long)__va(pa);
|
||||
printk("Kernel VA for NIP %x ", pa);
|
||||
print_8xx_pte(current->mm,pa);
|
||||
}
|
||||
}
|
||||
|
||||
if (retval == 0)
|
||||
regs->nip += 4;
|
||||
|
||||
return retval;
|
||||
}
|
|
@ -906,7 +906,9 @@ void SoftwareEmulation(struct pt_regs *regs)
|
|||
{
|
||||
extern int do_mathemu(struct pt_regs *);
|
||||
extern int Soft_emulate_8xx(struct pt_regs *);
|
||||
#if defined(CONFIG_MATH_EMULATION) || defined(CONFIG_8XX_MINIMAL_FPEMU)
|
||||
int errcode;
|
||||
#endif
|
||||
|
||||
CHECK_FULL_REGS(regs);
|
||||
|
||||
|
@ -936,7 +938,7 @@ void SoftwareEmulation(struct pt_regs *regs)
|
|||
return;
|
||||
}
|
||||
|
||||
#else
|
||||
#elif defined(CONFIG_8XX_MINIMAL_FPEMU)
|
||||
errcode = Soft_emulate_8xx(regs);
|
||||
switch (errcode) {
|
||||
case 0:
|
||||
|
@ -949,6 +951,8 @@ void SoftwareEmulation(struct pt_regs *regs)
|
|||
_exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
|
||||
return;
|
||||
}
|
||||
#else
|
||||
_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
|
||||
#endif
|
||||
}
|
||||
#endif /* CONFIG_8xx */
|
||||
|
|
Загрузка…
Ссылка в новой задаче