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Diffstat (limited to 'arch/sparc64/kernel/unaligned.c')
-rw-r--r--arch/sparc64/kernel/unaligned.c690
1 files changed, 0 insertions, 690 deletions
diff --git a/arch/sparc64/kernel/unaligned.c b/arch/sparc64/kernel/unaligned.c
deleted file mode 100644
index 203ddfad9f2..00000000000
--- a/arch/sparc64/kernel/unaligned.c
+++ /dev/null
@@ -1,690 +0,0 @@
-/*
- * unaligned.c: Unaligned load/store trap handling with special
- * cases for the kernel to do them more quickly.
- *
- * Copyright (C) 1996,2008 David S. Miller (davem@davemloft.net)
- * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- */
-
-
-#include <linux/jiffies.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <asm/asi.h>
-#include <asm/ptrace.h>
-#include <asm/pstate.h>
-#include <asm/processor.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <linux/smp.h>
-#include <linux/bitops.h>
-#include <asm/fpumacro.h>
-
-/* #define DEBUG_MNA */
-
-enum direction {
- load, /* ld, ldd, ldh, ldsh */
- store, /* st, std, sth, stsh */
- both, /* Swap, ldstub, cas, ... */
- fpld,
- fpst,
- 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 {
- switch ((insn>>19)&0xf) {
- case 15: /* swap* */
- return both;
- default:
- return store;
- }
- }
-}
-
-/* 16 = double-word, 8 = extra-word, 4 = word, 2 = half-word */
-static inline int decode_access_size(unsigned int insn)
-{
- unsigned int tmp;
-
- tmp = ((insn >> 19) & 0xf);
- if (tmp == 11 || tmp == 14) /* ldx/stx */
- return 8;
- tmp &= 3;
- if (!tmp)
- return 4;
- else if (tmp == 3)
- return 16; /* ldd/std - Although it is actually 8 */
- else if (tmp == 2)
- return 2;
- else {
- printk("Impossible unaligned trap. insn=%08x\n", insn);
- die_if_kernel("Byte sized unaligned access?!?!", current_thread_info()->kregs);
-
- /* GCC should never warn that control reaches the end
- * of this function without returning a value because
- * die_if_kernel() is marked with attribute 'noreturn'.
- * Alas, some versions do...
- */
-
- return 0;
- }
-}
-
-static inline int decode_asi(unsigned int insn, struct pt_regs *regs)
-{
- if (insn & 0x800000) {
- if (insn & 0x2000)
- return (unsigned char)(regs->tstate >> 24); /* %asi */
- else
- return (unsigned char)(insn >> 5); /* imm_asi */
- } else
- return ASI_P;
-}
-
-/* 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, int from_kernel)
-{
- if (rs2 >= 16 || rs1 >= 16 || rd >= 16) {
- if (from_kernel != 0)
- __asm__ __volatile__("flushw");
- else
- flushw_user();
- }
-}
-
-static inline long sign_extend_imm13(long imm)
-{
- return imm << 51 >> 51;
-}
-
-static unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
-{
- unsigned long value;
-
- if (reg < 16)
- return (!reg ? 0 : regs->u_regs[reg]);
- if (regs->tstate & TSTATE_PRIV) {
- struct reg_window *win;
- win = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS);
- value = win->locals[reg - 16];
- } else if (test_thread_flag(TIF_32BIT)) {
- struct reg_window32 __user *win32;
- win32 = (struct reg_window32 __user *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
- get_user(value, &win32->locals[reg - 16]);
- } else {
- struct reg_window __user *win;
- win = (struct reg_window __user *)(regs->u_regs[UREG_FP] + STACK_BIAS);
- get_user(value, &win->locals[reg - 16]);
- }
- return value;
-}
-
-static unsigned long *fetch_reg_addr(unsigned int reg, struct pt_regs *regs)
-{
- if (reg < 16)
- return &regs->u_regs[reg];
- if (regs->tstate & TSTATE_PRIV) {
- struct reg_window *win;
- win = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS);
- return &win->locals[reg - 16];
- } else if (test_thread_flag(TIF_32BIT)) {
- struct reg_window32 *win32;
- win32 = (struct reg_window32 *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
- return (unsigned long *)&win32->locals[reg - 16];
- } else {
- struct reg_window *win;
- win = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS);
- return &win->locals[reg - 16];
- }
-}
-
-unsigned long compute_effective_address(struct pt_regs *regs,
- unsigned int insn, unsigned int rd)
-{
- unsigned int rs1 = (insn >> 14) & 0x1f;
- unsigned int rs2 = insn & 0x1f;
- int from_kernel = (regs->tstate & TSTATE_PRIV) != 0;
-
- if (insn & 0x2000) {
- maybe_flush_windows(rs1, 0, rd, from_kernel);
- return (fetch_reg(rs1, regs) + sign_extend_imm13(insn));
- } else {
- maybe_flush_windows(rs1, rs2, rd, from_kernel);
- return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs));
- }
-}
-
-/* This is just to make gcc think die_if_kernel does return... */
-static void __used unaligned_panic(char *str, struct pt_regs *regs)
-{
- die_if_kernel(str, regs);
-}
-
-extern int do_int_load(unsigned long *dest_reg, int size,
- unsigned long *saddr, int is_signed, int asi);
-
-extern int __do_int_store(unsigned long *dst_addr, int size,
- unsigned long src_val, int asi);
-
-static inline int do_int_store(int reg_num, int size, unsigned long *dst_addr,
- struct pt_regs *regs, int asi, int orig_asi)
-{
- unsigned long zero = 0;
- unsigned long *src_val_p = &zero;
- unsigned long src_val;
-
- if (size == 16) {
- size = 8;
- zero = (((long)(reg_num ?
- (unsigned)fetch_reg(reg_num, regs) : 0)) << 32) |
- (unsigned)fetch_reg(reg_num + 1, regs);
- } else if (reg_num) {
- src_val_p = fetch_reg_addr(reg_num, regs);
- }
- src_val = *src_val_p;
- if (unlikely(asi != orig_asi)) {
- switch (size) {
- case 2:
- src_val = swab16(src_val);
- break;
- case 4:
- src_val = swab32(src_val);
- break;
- case 8:
- src_val = swab64(src_val);
- break;
- case 16:
- default:
- BUG();
- break;
- };
- }
- return __do_int_store(dst_addr, size, src_val, asi);
-}
-
-static inline void advance(struct pt_regs *regs)
-{
- regs->tpc = regs->tnpc;
- regs->tnpc += 4;
- if (test_thread_flag(TIF_32BIT)) {
- regs->tpc &= 0xffffffff;
- regs->tnpc &= 0xffffffff;
- }
-}
-
-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(int fixup_tstate_asi)
-{
- struct pt_regs *regs = current_thread_info()->kern_una_regs;
- unsigned int insn = current_thread_info()->kern_una_insn;
- const struct exception_table_entry *entry;
-
- entry = search_exception_tables(regs->tpc);
- if (!entry) {
- unsigned long address;
-
- address = compute_effective_address(regs, insn,
- ((insn >> 25) & 0x1f));
- 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 %016lx\n",address);
- printk(KERN_ALERT "current->{active_,}mm->context = %016lx\n",
- (current->mm ? CTX_HWBITS(current->mm->context) :
- CTX_HWBITS(current->active_mm->context)));
- printk(KERN_ALERT "current->{active_,}mm->pgd = %016lx\n",
- (current->mm ? (unsigned long) current->mm->pgd :
- (unsigned long) current->active_mm->pgd));
- die_if_kernel("Oops", regs);
- /* Not reached */
- }
- regs->tpc = entry->fixup;
- regs->tnpc = regs->tpc + 4;
-
- if (fixup_tstate_asi) {
- regs->tstate &= ~TSTATE_ASI;
- regs->tstate |= (ASI_AIUS << 24UL);
- }
-}
-
-static void log_unaligned(struct pt_regs *regs)
-{
- static unsigned long count, last_time;
-
- if (time_after(jiffies, last_time + 5 * HZ))
- count = 0;
- if (count < 5) {
- last_time = jiffies;
- count++;
- printk("Kernel unaligned access at TPC[%lx] %pS\n",
- regs->tpc, (void *) regs->tpc);
- }
-}
-
-asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
-{
- enum direction dir = decode_direction(insn);
- int size = decode_access_size(insn);
- int orig_asi, asi;
-
- current_thread_info()->kern_una_regs = regs;
- current_thread_info()->kern_una_insn = insn;
-
- orig_asi = asi = decode_asi(insn, regs);
-
- /* If this is a {get,put}_user() on an unaligned userspace pointer,
- * just signal a fault and do not log the event.
- */
- if (asi == ASI_AIUS) {
- kernel_mna_trap_fault(0);
- return;
- }
-
- log_unaligned(regs);
-
- if (!ok_for_kernel(insn) || dir == both) {
- printk("Unsupported unaligned load/store trap for kernel "
- "at <%016lx>.\n", regs->tpc);
- unaligned_panic("Kernel does fpu/atomic "
- "unaligned load/store.", regs);
-
- kernel_mna_trap_fault(0);
- } else {
- unsigned long addr, *reg_addr;
- int err;
-
- addr = compute_effective_address(regs, insn,
- ((insn >> 25) & 0x1f));
-#ifdef DEBUG_MNA
- printk("KMNA: pc=%016lx [dir=%s addr=%016lx size=%d] "
- "retpc[%016lx]\n",
- regs->tpc, dirstrings[dir], addr, size,
- regs->u_regs[UREG_RETPC]);
-#endif
- switch (asi) {
- case ASI_NL:
- case ASI_AIUPL:
- case ASI_AIUSL:
- case ASI_PL:
- case ASI_SL:
- case ASI_PNFL:
- case ASI_SNFL:
- asi &= ~0x08;
- break;
- };
- switch (dir) {
- case load:
- reg_addr = fetch_reg_addr(((insn>>25)&0x1f), regs);
- err = do_int_load(reg_addr, size,
- (unsigned long *) addr,
- decode_signedness(insn), asi);
- if (likely(!err) && unlikely(asi != orig_asi)) {
- unsigned long val_in = *reg_addr;
- switch (size) {
- case 2:
- val_in = swab16(val_in);
- break;
- case 4:
- val_in = swab32(val_in);
- break;
- case 8:
- val_in = swab64(val_in);
- break;
- case 16:
- default:
- BUG();
- break;
- };
- *reg_addr = val_in;
- }
- break;
-
- case store:
- err = do_int_store(((insn>>25)&0x1f), size,
- (unsigned long *) addr, regs,
- asi, orig_asi);
- break;
-
- default:
- panic("Impossible kernel unaligned trap.");
- /* Not reached... */
- }
- if (unlikely(err))
- kernel_mna_trap_fault(1);
- else
- advance(regs);
- }
-}
-
-static char popc_helper[] = {
-0, 1, 1, 2, 1, 2, 2, 3,
-1, 2, 2, 3, 2, 3, 3, 4,
-};
-
-int handle_popc(u32 insn, struct pt_regs *regs)
-{
- u64 value;
- int ret, i, rd = ((insn >> 25) & 0x1f);
- int from_kernel = (regs->tstate & TSTATE_PRIV) != 0;
-
- if (insn & 0x2000) {
- maybe_flush_windows(0, 0, rd, from_kernel);
- value = sign_extend_imm13(insn);
- } else {
- maybe_flush_windows(0, insn & 0x1f, rd, from_kernel);
- value = fetch_reg(insn & 0x1f, regs);
- }
- for (ret = 0, i = 0; i < 16; i++) {
- ret += popc_helper[value & 0xf];
- value >>= 4;
- }
- if (rd < 16) {
- if (rd)
- regs->u_regs[rd] = ret;
- } else {
- if (test_thread_flag(TIF_32BIT)) {
- struct reg_window32 __user *win32;
- win32 = (struct reg_window32 __user *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
- put_user(ret, &win32->locals[rd - 16]);
- } else {
- struct reg_window __user *win;
- win = (struct reg_window __user *)(regs->u_regs[UREG_FP] + STACK_BIAS);
- put_user(ret, &win->locals[rd - 16]);
- }
- }
- advance(regs);
- return 1;
-}
-
-extern void do_fpother(struct pt_regs *regs);
-extern void do_privact(struct pt_regs *regs);
-extern void spitfire_data_access_exception(struct pt_regs *regs,
- unsigned long sfsr,
- unsigned long sfar);
-extern void sun4v_data_access_exception(struct pt_regs *regs,
- unsigned long addr,
- unsigned long type_ctx);
-
-int handle_ldf_stq(u32 insn, struct pt_regs *regs)
-{
- unsigned long addr = compute_effective_address(regs, insn, 0);
- int freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20);
- struct fpustate *f = FPUSTATE;
- int asi = decode_asi(insn, regs);
- int flag = (freg < 32) ? FPRS_DL : FPRS_DU;
-
- save_and_clear_fpu();
- current_thread_info()->xfsr[0] &= ~0x1c000;
- if (freg & 3) {
- current_thread_info()->xfsr[0] |= (6 << 14) /* invalid_fp_register */;
- do_fpother(regs);
- return 0;
- }
- if (insn & 0x200000) {
- /* STQ */
- u64 first = 0, second = 0;
-
- if (current_thread_info()->fpsaved[0] & flag) {
- first = *(u64 *)&f->regs[freg];
- second = *(u64 *)&f->regs[freg+2];
- }
- if (asi < 0x80) {
- do_privact(regs);
- return 1;
- }
- switch (asi) {
- case ASI_P:
- case ASI_S: break;
- case ASI_PL:
- case ASI_SL:
- {
- /* Need to convert endians */
- u64 tmp = __swab64p(&first);
-
- first = __swab64p(&second);
- second = tmp;
- break;
- }
- default:
- if (tlb_type == hypervisor)
- sun4v_data_access_exception(regs, addr, 0);
- else
- spitfire_data_access_exception(regs, 0, addr);
- return 1;
- }
- if (put_user (first >> 32, (u32 __user *)addr) ||
- __put_user ((u32)first, (u32 __user *)(addr + 4)) ||
- __put_user (second >> 32, (u32 __user *)(addr + 8)) ||
- __put_user ((u32)second, (u32 __user *)(addr + 12))) {
- if (tlb_type == hypervisor)
- sun4v_data_access_exception(regs, addr, 0);
- else
- spitfire_data_access_exception(regs, 0, addr);
- return 1;
- }
- } else {
- /* LDF, LDDF, LDQF */
- u32 data[4] __attribute__ ((aligned(8)));
- int size, i;
- int err;
-
- if (asi < 0x80) {
- do_privact(regs);
- return 1;
- } else if (asi > ASI_SNFL) {
- if (tlb_type == hypervisor)
- sun4v_data_access_exception(regs, addr, 0);
- else
- spitfire_data_access_exception(regs, 0, addr);
- return 1;
- }
- switch (insn & 0x180000) {
- case 0x000000: size = 1; break;
- case 0x100000: size = 4; break;
- default: size = 2; break;
- }
- for (i = 0; i < size; i++)
- data[i] = 0;
-
- err = get_user (data[0], (u32 __user *) addr);
- if (!err) {
- for (i = 1; i < size; i++)
- err |= __get_user (data[i], (u32 __user *)(addr + 4*i));
- }
- if (err && !(asi & 0x2 /* NF */)) {
- if (tlb_type == hypervisor)
- sun4v_data_access_exception(regs, addr, 0);
- else
- spitfire_data_access_exception(regs, 0, addr);
- return 1;
- }
- if (asi & 0x8) /* Little */ {
- u64 tmp;
-
- switch (size) {
- case 1: data[0] = le32_to_cpup(data + 0); break;
- default:*(u64 *)(data + 0) = le64_to_cpup((u64 *)(data + 0));
- break;
- case 4: tmp = le64_to_cpup((u64 *)(data + 0));
- *(u64 *)(data + 0) = le64_to_cpup((u64 *)(data + 2));
- *(u64 *)(data + 2) = tmp;
- break;
- }
- }
- if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) {
- current_thread_info()->fpsaved[0] = FPRS_FEF;
- current_thread_info()->gsr[0] = 0;
- }
- if (!(current_thread_info()->fpsaved[0] & flag)) {
- if (freg < 32)
- memset(f->regs, 0, 32*sizeof(u32));
- else
- memset(f->regs+32, 0, 32*sizeof(u32));
- }
- memcpy(f->regs + freg, data, size * 4);
- current_thread_info()->fpsaved[0] |= flag;
- }
- advance(regs);
- return 1;
-}
-
-void handle_ld_nf(u32 insn, struct pt_regs *regs)
-{
- int rd = ((insn >> 25) & 0x1f);
- int from_kernel = (regs->tstate & TSTATE_PRIV) != 0;
- unsigned long *reg;
-
- maybe_flush_windows(0, 0, rd, from_kernel);
- reg = fetch_reg_addr(rd, regs);
- if (from_kernel || rd < 16) {
- reg[0] = 0;
- if ((insn & 0x780000) == 0x180000)
- reg[1] = 0;
- } else if (test_thread_flag(TIF_32BIT)) {
- put_user(0, (int __user *) reg);
- if ((insn & 0x780000) == 0x180000)
- put_user(0, ((int __user *) reg) + 1);
- } else {
- put_user(0, (unsigned long __user *) reg);
- if ((insn & 0x780000) == 0x180000)
- put_user(0, (unsigned long __user *) reg + 1);
- }
- advance(regs);
-}
-
-void handle_lddfmna(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr)
-{
- unsigned long pc = regs->tpc;
- unsigned long tstate = regs->tstate;
- u32 insn;
- u32 first, second;
- u64 value;
- u8 freg;
- int flag;
- struct fpustate *f = FPUSTATE;
-
- if (tstate & TSTATE_PRIV)
- die_if_kernel("lddfmna from kernel", regs);
- if (test_thread_flag(TIF_32BIT))
- pc = (u32)pc;
- if (get_user(insn, (u32 __user *) pc) != -EFAULT) {
- int asi = decode_asi(insn, regs);
- if ((asi > ASI_SNFL) ||
- (asi < ASI_P))
- goto daex;
- if (get_user(first, (u32 __user *)sfar) ||
- get_user(second, (u32 __user *)(sfar + 4))) {
- if (asi & 0x2) /* NF */ {
- first = 0; second = 0;
- } else
- goto daex;
- }
- save_and_clear_fpu();
- freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20);
- value = (((u64)first) << 32) | second;
- if (asi & 0x8) /* Little */
- value = __swab64p(&value);
- flag = (freg < 32) ? FPRS_DL : FPRS_DU;
- if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) {
- current_thread_info()->fpsaved[0] = FPRS_FEF;
- current_thread_info()->gsr[0] = 0;
- }
- if (!(current_thread_info()->fpsaved[0] & flag)) {
- if (freg < 32)
- memset(f->regs, 0, 32*sizeof(u32));
- else
- memset(f->regs+32, 0, 32*sizeof(u32));
- }
- *(u64 *)(f->regs + freg) = value;
- current_thread_info()->fpsaved[0] |= flag;
- } else {
-daex:
- if (tlb_type == hypervisor)
- sun4v_data_access_exception(regs, sfar, sfsr);
- else
- spitfire_data_access_exception(regs, sfsr, sfar);
- return;
- }
- advance(regs);
- return;
-}
-
-void handle_stdfmna(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr)
-{
- unsigned long pc = regs->tpc;
- unsigned long tstate = regs->tstate;
- u32 insn;
- u64 value;
- u8 freg;
- int flag;
- struct fpustate *f = FPUSTATE;
-
- if (tstate & TSTATE_PRIV)
- die_if_kernel("stdfmna from kernel", regs);
- if (test_thread_flag(TIF_32BIT))
- pc = (u32)pc;
- if (get_user(insn, (u32 __user *) pc) != -EFAULT) {
- int asi = decode_asi(insn, regs);
- freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20);
- value = 0;
- flag = (freg < 32) ? FPRS_DL : FPRS_DU;
- if ((asi > ASI_SNFL) ||
- (asi < ASI_P))
- goto daex;
- save_and_clear_fpu();
- if (current_thread_info()->fpsaved[0] & flag)
- value = *(u64 *)&f->regs[freg];
- switch (asi) {
- case ASI_P:
- case ASI_S: break;
- case ASI_PL:
- case ASI_SL:
- value = __swab64p(&value); break;
- default: goto daex;
- }
- if (put_user (value >> 32, (u32 __user *) sfar) ||
- __put_user ((u32)value, (u32 __user *)(sfar + 4)))
- goto daex;
- } else {
-daex:
- if (tlb_type == hypervisor)
- sun4v_data_access_exception(regs, sfar, sfsr);
- else
- spitfire_data_access_exception(regs, sfsr, sfar);
- return;
- }
- advance(regs);
- return;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-12 10:14:28 +0000