forked from Minki/linux
20c2df83d2
Slab destructors were no longer supported after Christoph's
c59def9f22 change. They've been
BUGs for both slab and slub, and slob never supported them
either.
This rips out support for the dtor pointer from kmem_cache_create()
completely and fixes up every single callsite in the kernel (there were
about 224, not including the slab allocator definitions themselves,
or the documentation references).
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
263 lines
6.8 KiB
C
263 lines
6.8 KiB
C
/*
|
|
* IA32 helper functions
|
|
*
|
|
* Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
|
|
* Copyright (C) 2000 Asit K. Mallick <asit.k.mallick@intel.com>
|
|
* Copyright (C) 2001-2002 Hewlett-Packard Co
|
|
* David Mosberger-Tang <davidm@hpl.hp.com>
|
|
*
|
|
* 06/16/00 A. Mallick added csd/ssd/tssd for ia32 thread context
|
|
* 02/19/01 D. Mosberger dropped tssd; it's not needed
|
|
* 09/14/01 D. Mosberger fixed memory management for gdt/tss page
|
|
* 09/29/01 D. Mosberger added ia32_load_segment_descriptors()
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/personality.h>
|
|
#include <linux/sched.h>
|
|
|
|
#include <asm/intrinsics.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/system.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#include "ia32priv.h"
|
|
|
|
extern void die_if_kernel (char *str, struct pt_regs *regs, long err);
|
|
|
|
struct exec_domain ia32_exec_domain;
|
|
struct page *ia32_shared_page[NR_CPUS];
|
|
unsigned long *ia32_boot_gdt;
|
|
unsigned long *cpu_gdt_table[NR_CPUS];
|
|
struct page *ia32_gate_page;
|
|
|
|
static unsigned long
|
|
load_desc (u16 selector)
|
|
{
|
|
unsigned long *table, limit, index;
|
|
|
|
if (!selector)
|
|
return 0;
|
|
if (selector & IA32_SEGSEL_TI) {
|
|
table = (unsigned long *) IA32_LDT_OFFSET;
|
|
limit = IA32_LDT_ENTRIES;
|
|
} else {
|
|
table = cpu_gdt_table[smp_processor_id()];
|
|
limit = IA32_PAGE_SIZE / sizeof(ia32_boot_gdt[0]);
|
|
}
|
|
index = selector >> IA32_SEGSEL_INDEX_SHIFT;
|
|
if (index >= limit)
|
|
return 0;
|
|
return IA32_SEG_UNSCRAMBLE(table[index]);
|
|
}
|
|
|
|
void
|
|
ia32_load_segment_descriptors (struct task_struct *task)
|
|
{
|
|
struct pt_regs *regs = task_pt_regs(task);
|
|
|
|
/* Setup the segment descriptors */
|
|
regs->r24 = load_desc(regs->r16 >> 16); /* ESD */
|
|
regs->r27 = load_desc(regs->r16 >> 0); /* DSD */
|
|
regs->r28 = load_desc(regs->r16 >> 32); /* FSD */
|
|
regs->r29 = load_desc(regs->r16 >> 48); /* GSD */
|
|
regs->ar_csd = load_desc(regs->r17 >> 0); /* CSD */
|
|
regs->ar_ssd = load_desc(regs->r17 >> 16); /* SSD */
|
|
}
|
|
|
|
int
|
|
ia32_clone_tls (struct task_struct *child, struct pt_regs *childregs)
|
|
{
|
|
struct desc_struct *desc;
|
|
struct ia32_user_desc info;
|
|
int idx;
|
|
|
|
if (copy_from_user(&info, (void __user *)(childregs->r14 & 0xffffffff), sizeof(info)))
|
|
return -EFAULT;
|
|
if (LDT_empty(&info))
|
|
return -EINVAL;
|
|
|
|
idx = info.entry_number;
|
|
if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
|
|
return -EINVAL;
|
|
|
|
desc = child->thread.tls_array + idx - GDT_ENTRY_TLS_MIN;
|
|
desc->a = LDT_entry_a(&info);
|
|
desc->b = LDT_entry_b(&info);
|
|
|
|
/* XXX: can this be done in a cleaner way ? */
|
|
load_TLS(&child->thread, smp_processor_id());
|
|
ia32_load_segment_descriptors(child);
|
|
load_TLS(¤t->thread, smp_processor_id());
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
ia32_save_state (struct task_struct *t)
|
|
{
|
|
t->thread.eflag = ia64_getreg(_IA64_REG_AR_EFLAG);
|
|
t->thread.fsr = ia64_getreg(_IA64_REG_AR_FSR);
|
|
t->thread.fcr = ia64_getreg(_IA64_REG_AR_FCR);
|
|
t->thread.fir = ia64_getreg(_IA64_REG_AR_FIR);
|
|
t->thread.fdr = ia64_getreg(_IA64_REG_AR_FDR);
|
|
ia64_set_kr(IA64_KR_IO_BASE, t->thread.old_iob);
|
|
ia64_set_kr(IA64_KR_TSSD, t->thread.old_k1);
|
|
}
|
|
|
|
void
|
|
ia32_load_state (struct task_struct *t)
|
|
{
|
|
unsigned long eflag, fsr, fcr, fir, fdr, tssd;
|
|
struct pt_regs *regs = task_pt_regs(t);
|
|
|
|
eflag = t->thread.eflag;
|
|
fsr = t->thread.fsr;
|
|
fcr = t->thread.fcr;
|
|
fir = t->thread.fir;
|
|
fdr = t->thread.fdr;
|
|
tssd = load_desc(_TSS); /* TSSD */
|
|
|
|
ia64_setreg(_IA64_REG_AR_EFLAG, eflag);
|
|
ia64_setreg(_IA64_REG_AR_FSR, fsr);
|
|
ia64_setreg(_IA64_REG_AR_FCR, fcr);
|
|
ia64_setreg(_IA64_REG_AR_FIR, fir);
|
|
ia64_setreg(_IA64_REG_AR_FDR, fdr);
|
|
current->thread.old_iob = ia64_get_kr(IA64_KR_IO_BASE);
|
|
current->thread.old_k1 = ia64_get_kr(IA64_KR_TSSD);
|
|
ia64_set_kr(IA64_KR_IO_BASE, IA32_IOBASE);
|
|
ia64_set_kr(IA64_KR_TSSD, tssd);
|
|
|
|
regs->r17 = (_TSS << 48) | (_LDT << 32) | (__u32) regs->r17;
|
|
regs->r30 = load_desc(_LDT); /* LDTD */
|
|
load_TLS(&t->thread, smp_processor_id());
|
|
}
|
|
|
|
/*
|
|
* Setup IA32 GDT and TSS
|
|
*/
|
|
void
|
|
ia32_gdt_init (void)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
|
|
ia32_shared_page[cpu] = alloc_page(GFP_KERNEL);
|
|
if (!ia32_shared_page[cpu])
|
|
panic("failed to allocate ia32_shared_page[%d]\n", cpu);
|
|
|
|
cpu_gdt_table[cpu] = page_address(ia32_shared_page[cpu]);
|
|
|
|
/* Copy from the boot cpu's GDT */
|
|
memcpy(cpu_gdt_table[cpu], ia32_boot_gdt, PAGE_SIZE);
|
|
}
|
|
|
|
|
|
/*
|
|
* Setup IA32 GDT and TSS
|
|
*/
|
|
static void
|
|
ia32_boot_gdt_init (void)
|
|
{
|
|
unsigned long ldt_size;
|
|
|
|
ia32_shared_page[0] = alloc_page(GFP_KERNEL);
|
|
if (!ia32_shared_page[0])
|
|
panic("failed to allocate ia32_shared_page[0]\n");
|
|
|
|
ia32_boot_gdt = page_address(ia32_shared_page[0]);
|
|
cpu_gdt_table[0] = ia32_boot_gdt;
|
|
|
|
/* CS descriptor in IA-32 (scrambled) format */
|
|
ia32_boot_gdt[__USER_CS >> 3]
|
|
= IA32_SEG_DESCRIPTOR(0, (IA32_GATE_END-1) >> IA32_PAGE_SHIFT,
|
|
0xb, 1, 3, 1, 1, 1, 1);
|
|
|
|
/* DS descriptor in IA-32 (scrambled) format */
|
|
ia32_boot_gdt[__USER_DS >> 3]
|
|
= IA32_SEG_DESCRIPTOR(0, (IA32_GATE_END-1) >> IA32_PAGE_SHIFT,
|
|
0x3, 1, 3, 1, 1, 1, 1);
|
|
|
|
ldt_size = PAGE_ALIGN(IA32_LDT_ENTRIES*IA32_LDT_ENTRY_SIZE);
|
|
ia32_boot_gdt[TSS_ENTRY] = IA32_SEG_DESCRIPTOR(IA32_TSS_OFFSET, 235,
|
|
0xb, 0, 3, 1, 1, 1, 0);
|
|
ia32_boot_gdt[LDT_ENTRY] = IA32_SEG_DESCRIPTOR(IA32_LDT_OFFSET, ldt_size - 1,
|
|
0x2, 0, 3, 1, 1, 1, 0);
|
|
}
|
|
|
|
static void
|
|
ia32_gate_page_init(void)
|
|
{
|
|
unsigned long *sr;
|
|
|
|
ia32_gate_page = alloc_page(GFP_KERNEL);
|
|
sr = page_address(ia32_gate_page);
|
|
/* This is popl %eax ; movl $,%eax ; int $0x80 */
|
|
*sr++ = 0xb858 | (__IA32_NR_sigreturn << 16) | (0x80cdUL << 48);
|
|
|
|
/* This is movl $,%eax ; int $0x80 */
|
|
*sr = 0xb8 | (__IA32_NR_rt_sigreturn << 8) | (0x80cdUL << 40);
|
|
}
|
|
|
|
void
|
|
ia32_mem_init(void)
|
|
{
|
|
ia32_boot_gdt_init();
|
|
ia32_gate_page_init();
|
|
}
|
|
|
|
/*
|
|
* Handle bad IA32 interrupt via syscall
|
|
*/
|
|
void
|
|
ia32_bad_interrupt (unsigned long int_num, struct pt_regs *regs)
|
|
{
|
|
siginfo_t siginfo;
|
|
|
|
die_if_kernel("Bad IA-32 interrupt", regs, int_num);
|
|
|
|
siginfo.si_signo = SIGTRAP;
|
|
siginfo.si_errno = int_num; /* XXX is it OK to abuse si_errno like this? */
|
|
siginfo.si_flags = 0;
|
|
siginfo.si_isr = 0;
|
|
siginfo.si_addr = NULL;
|
|
siginfo.si_imm = 0;
|
|
siginfo.si_code = TRAP_BRKPT;
|
|
force_sig_info(SIGTRAP, &siginfo, current);
|
|
}
|
|
|
|
void
|
|
ia32_cpu_init (void)
|
|
{
|
|
/* initialize global ia32 state - CR0 and CR4 */
|
|
ia64_setreg(_IA64_REG_AR_CFLAG, (((ulong) IA32_CR4 << 32) | IA32_CR0));
|
|
}
|
|
|
|
static int __init
|
|
ia32_init (void)
|
|
{
|
|
ia32_exec_domain.name = "Linux/x86";
|
|
ia32_exec_domain.handler = NULL;
|
|
ia32_exec_domain.pers_low = PER_LINUX32;
|
|
ia32_exec_domain.pers_high = PER_LINUX32;
|
|
ia32_exec_domain.signal_map = default_exec_domain.signal_map;
|
|
ia32_exec_domain.signal_invmap = default_exec_domain.signal_invmap;
|
|
register_exec_domain(&ia32_exec_domain);
|
|
|
|
#if PAGE_SHIFT > IA32_PAGE_SHIFT
|
|
{
|
|
extern struct kmem_cache *partial_page_cachep;
|
|
|
|
partial_page_cachep = kmem_cache_create("partial_page_cache",
|
|
sizeof(struct partial_page),
|
|
0, SLAB_PANIC, NULL);
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
__initcall(ia32_init);
|