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Diffstat (limited to 'arch/sparc/kernel/unaligned.c')
-rw-r--r--arch/sparc/kernel/unaligned.c390
1 files changed, 0 insertions, 390 deletions
diff --git a/arch/sparc/kernel/unaligned.c b/arch/sparc/kernel/unaligned.c
deleted file mode 100644
index c2a28c5ad65..00000000000
--- a/arch/sparc/kernel/unaligned.c
+++ /dev/null
@@ -1,390 +0,0 @@
-/*
- * unaligned.c: Unaligned load/store trap handling with special
- * cases for the kernel to do them more quickly.
- *
- * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
- * Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- */
-
-
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <asm/ptrace.h>
-#include <asm/processor.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <linux/smp.h>
-#include <linux/smp_lock.h>
-
-/* #define DEBUG_MNA */
-
-enum direction {
- load, /* ld, ldd, ldh, ldsh */
- store, /* st, std, sth, stsh */
- both, /* Swap, ldstub, etc. */
- fpload,
- fpstore,
- invalid,
-};
-
-#ifdef DEBUG_MNA
-static char *dirstrings[] = {
- "load", "store", "both", "fpload", "fpstore", "invalid"
-};
-#endif
-
-static inline enum direction decode_direction(unsigned int insn)
-{
- unsigned long tmp = (insn >> 21) & 1;
-
- if(!tmp)
- return load;
- else {
- if(((insn>>19)&0x3f) == 15)
- return both;
- else
- return store;
- }
-}
-
-/* 8 = double-word, 4 = word, 2 = half-word */
-static inline int decode_access_size(unsigned int insn)
-{
- insn = (insn >> 19) & 3;
-
- if(!insn)
- return 4;
- else if(insn == 3)
- return 8;
- else if(insn == 2)
- return 2;
- else {
- printk("Impossible unaligned trap. insn=%08x\n", insn);
- die_if_kernel("Byte sized unaligned access?!?!", current->thread.kregs);
- return 4; /* just to keep gcc happy. */
- }
-}
-
-/* 0x400000 = signed, 0 = unsigned */
-static inline int decode_signedness(unsigned int insn)
-{
- return (insn & 0x400000);
-}
-
-static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
- unsigned int rd)
-{
- if(rs2 >= 16 || rs1 >= 16 || rd >= 16) {
- /* Wheee... */
- __asm__ __volatile__("save %sp, -0x40, %sp\n\t"
- "save %sp, -0x40, %sp\n\t"
- "save %sp, -0x40, %sp\n\t"
- "save %sp, -0x40, %sp\n\t"
- "save %sp, -0x40, %sp\n\t"
- "save %sp, -0x40, %sp\n\t"
- "save %sp, -0x40, %sp\n\t"
- "restore; restore; restore; restore;\n\t"
- "restore; restore; restore;\n\t");
- }
-}
-
-static inline int sign_extend_imm13(int imm)
-{
- return imm << 19 >> 19;
-}
-
-static inline unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
-{
- struct reg_window *win;
-
- if(reg < 16)
- return (!reg ? 0 : regs->u_regs[reg]);
-
- /* Ho hum, the slightly complicated case. */
- win = (struct reg_window *) regs->u_regs[UREG_FP];
- return win->locals[reg - 16]; /* yes, I know what this does... */
-}
-
-static inline unsigned long safe_fetch_reg(unsigned int reg, struct pt_regs *regs)
-{
- struct reg_window __user *win;
- unsigned long ret;
-
- if (reg < 16)
- return (!reg ? 0 : regs->u_regs[reg]);
-
- /* Ho hum, the slightly complicated case. */
- win = (struct reg_window __user *) regs->u_regs[UREG_FP];
-
- if ((unsigned long)win & 3)
- return -1;
-
- if (get_user(ret, &win->locals[reg - 16]))
- return -1;
-
- return ret;
-}
-
-static inline unsigned long *fetch_reg_addr(unsigned int reg, struct pt_regs *regs)
-{
- struct reg_window *win;
-
- if(reg < 16)
- return &regs->u_regs[reg];
- win = (struct reg_window *) regs->u_regs[UREG_FP];
- return &win->locals[reg - 16];
-}
-
-static unsigned long compute_effective_address(struct pt_regs *regs,
- unsigned int insn)
-{
- unsigned int rs1 = (insn >> 14) & 0x1f;
- unsigned int rs2 = insn & 0x1f;
- unsigned int rd = (insn >> 25) & 0x1f;
-
- if(insn & 0x2000) {
- maybe_flush_windows(rs1, 0, rd);
- return (fetch_reg(rs1, regs) + sign_extend_imm13(insn));
- } else {
- maybe_flush_windows(rs1, rs2, rd);
- return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs));
- }
-}
-
-unsigned long safe_compute_effective_address(struct pt_regs *regs,
- unsigned int insn)
-{
- unsigned int rs1 = (insn >> 14) & 0x1f;
- unsigned int rs2 = insn & 0x1f;
- unsigned int rd = (insn >> 25) & 0x1f;
-
- if(insn & 0x2000) {
- maybe_flush_windows(rs1, 0, rd);
- return (safe_fetch_reg(rs1, regs) + sign_extend_imm13(insn));
- } else {
- maybe_flush_windows(rs1, rs2, rd);
- return (safe_fetch_reg(rs1, regs) + safe_fetch_reg(rs2, regs));
- }
-}
-
-/* This is just to make gcc think panic does return... */
-static void unaligned_panic(char *str)
-{
- panic(str);
-}
-
-/* una_asm.S */
-extern int do_int_load(unsigned long *dest_reg, int size,
- unsigned long *saddr, int is_signed);
-extern int __do_int_store(unsigned long *dst_addr, int size,
- unsigned long *src_val);
-
-static int do_int_store(int reg_num, int size, unsigned long *dst_addr,
- struct pt_regs *regs)
-{
- unsigned long zero[2] = { 0, 0 };
- unsigned long *src_val;
-
- if (reg_num)
- src_val = fetch_reg_addr(reg_num, regs);
- else {
- src_val = &zero[0];
- if (size == 8)
- zero[1] = fetch_reg(1, regs);
- }
- return __do_int_store(dst_addr, size, src_val);
-}
-
-extern void smp_capture(void);
-extern void smp_release(void);
-
-static inline void advance(struct pt_regs *regs)
-{
- regs->pc = regs->npc;
- regs->npc += 4;
-}
-
-static inline int floating_point_load_or_store_p(unsigned int insn)
-{
- return (insn >> 24) & 1;
-}
-
-static inline int ok_for_kernel(unsigned int insn)
-{
- return !floating_point_load_or_store_p(insn);
-}
-
-static void kernel_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
-{
- unsigned long g2 = regs->u_regs [UREG_G2];
- unsigned long fixup = search_extables_range(regs->pc, &g2);
-
- if (!fixup) {
- unsigned long address = compute_effective_address(regs, insn);
- if(address < PAGE_SIZE) {
- printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference in mna handler");
- } else
- printk(KERN_ALERT "Unable to handle kernel paging request in mna handler");
- printk(KERN_ALERT " at virtual address %08lx\n",address);
- printk(KERN_ALERT "current->{mm,active_mm}->context = %08lx\n",
- (current->mm ? current->mm->context :
- current->active_mm->context));
- printk(KERN_ALERT "current->{mm,active_mm}->pgd = %08lx\n",
- (current->mm ? (unsigned long) current->mm->pgd :
- (unsigned long) current->active_mm->pgd));
- die_if_kernel("Oops", regs);
- /* Not reached */
- }
- regs->pc = fixup;
- regs->npc = regs->pc + 4;
- regs->u_regs [UREG_G2] = g2;
-}
-
-asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
-{
- enum direction dir = decode_direction(insn);
- int size = decode_access_size(insn);
-
- if(!ok_for_kernel(insn) || dir == both) {
- printk("Unsupported unaligned load/store trap for kernel at <%08lx>.\n",
- regs->pc);
- unaligned_panic("Wheee. Kernel does fpu/atomic unaligned load/store.");
- } else {
- unsigned long addr = compute_effective_address(regs, insn);
- int err;
-
-#ifdef DEBUG_MNA
- printk("KMNA: pc=%08lx [dir=%s addr=%08lx size=%d] retpc[%08lx]\n",
- regs->pc, dirstrings[dir], addr, size, regs->u_regs[UREG_RETPC]);
-#endif
- switch (dir) {
- case load:
- err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
- regs),
- size, (unsigned long *) addr,
- decode_signedness(insn));
- break;
-
- case store:
- err = do_int_store(((insn>>25)&0x1f), size,
- (unsigned long *) addr, regs);
- break;
- default:
- panic("Impossible kernel unaligned trap.");
- /* Not reached... */
- }
- if (err)
- kernel_mna_trap_fault(regs, insn);
- else
- advance(regs);
- }
-}
-
-static inline int ok_for_user(struct pt_regs *regs, unsigned int insn,
- enum direction dir)
-{
- unsigned int reg;
- int check = (dir == load) ? VERIFY_READ : VERIFY_WRITE;
- int size = ((insn >> 19) & 3) == 3 ? 8 : 4;
-
- if ((regs->pc | regs->npc) & 3)
- return 0;
-
- /* Must access_ok() in all the necessary places. */
-#define WINREG_ADDR(regnum) \
- ((void __user *)(((unsigned long *)regs->u_regs[UREG_FP])+(regnum)))
-
- reg = (insn >> 25) & 0x1f;
- if (reg >= 16) {
- if (!access_ok(check, WINREG_ADDR(reg - 16), size))
- return -EFAULT;
- }
- reg = (insn >> 14) & 0x1f;
- if (reg >= 16) {
- if (!access_ok(check, WINREG_ADDR(reg - 16), size))
- return -EFAULT;
- }
- if (!(insn & 0x2000)) {
- reg = (insn & 0x1f);
- if (reg >= 16) {
- if (!access_ok(check, WINREG_ADDR(reg - 16), size))
- return -EFAULT;
- }
- }
-#undef WINREG_ADDR
- return 0;
-}
-
-static void user_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
-{
- siginfo_t info;
-
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRALN;
- info.si_addr = (void __user *)safe_compute_effective_address(regs, insn);
- info.si_trapno = 0;
- send_sig_info(SIGBUS, &info, current);
-}
-
-asmlinkage void user_unaligned_trap(struct pt_regs *regs, unsigned int insn)
-{
- enum direction dir;
-
- lock_kernel();
- if(!(current->thread.flags & SPARC_FLAG_UNALIGNED) ||
- (((insn >> 30) & 3) != 3))
- goto kill_user;
- dir = decode_direction(insn);
- if(!ok_for_user(regs, insn, dir)) {
- goto kill_user;
- } else {
- int err, size = decode_access_size(insn);
- unsigned long addr;
-
- if(floating_point_load_or_store_p(insn)) {
- printk("User FPU load/store unaligned unsupported.\n");
- goto kill_user;
- }
-
- addr = compute_effective_address(regs, insn);
- switch(dir) {
- case load:
- err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
- regs),
- size, (unsigned long *) addr,
- decode_signedness(insn));
- break;
-
- case store:
- err = do_int_store(((insn>>25)&0x1f), size,
- (unsigned long *) addr, regs);
- break;
-
- case both:
- /*
- * This was supported in 2.4. However, we question
- * the value of SWAP instruction across word boundaries.
- */
- printk("Unaligned SWAP unsupported.\n");
- err = -EFAULT;
- break;
-
- default:
- unaligned_panic("Impossible user unaligned trap.");
- goto out;
- }
- if (err)
- goto kill_user;
- else
- advance(regs);
- goto out;
- }
-
-kill_user:
- user_mna_trap_fault(regs, insn);
-out:
- unlock_kernel();
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 15:09:20 +0000