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-rw-r--r--arch/sparc/kernel/muldiv.c238
1 files changed, 0 insertions, 238 deletions
diff --git a/arch/sparc/kernel/muldiv.c b/arch/sparc/kernel/muldiv.c
deleted file mode 100644
index f7db516b07d8..000000000000
--- a/arch/sparc/kernel/muldiv.c
+++ /dev/null
@@ -1,238 +0,0 @@
-/*
- * muldiv.c: Hardware multiply/division illegal instruction trap
- * for sun4c/sun4 (which do not have those instructions)
- *
- * Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
- *
- * 2004-12-25 Krzysztof Helt (krzysztof.h1@wp.pl)
- * - fixed registers constrains in inline assembly declarations
- */
-
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <asm/ptrace.h>
-#include <asm/processor.h>
-#include <asm/uaccess.h>
-
-#include "kernel.h"
-
-/* #define DEBUG_MULDIV */
-
-static inline int has_imm13(int insn)
-{
- return (insn & 0x2000);
-}
-
-static inline int is_foocc(int insn)
-{
- return (insn & 0x800000);
-}
-
-static inline int sign_extend_imm13(int imm)
-{
- return imm << 19 >> 19;
-}
-
-static inline void advance(struct pt_regs *regs)
-{
- regs->pc = regs->npc;
- regs->npc += 4;
-}
-
-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");
- }
-}
-
-#define fetch_reg(reg, regs) ({ \
- struct reg_window32 __user *win; \
- register unsigned long ret; \
- \
- if (!(reg)) ret = 0; \
- else if ((reg) < 16) { \
- ret = regs->u_regs[(reg)]; \
- } else { \
- /* Ho hum, the slightly complicated case. */ \
- win = (struct reg_window32 __user *)regs->u_regs[UREG_FP];\
- if (get_user (ret, &win->locals[(reg) - 16])) return -1;\
- } \
- ret; \
-})
-
-static inline int
-store_reg(unsigned int result, unsigned int reg, struct pt_regs *regs)
-{
- struct reg_window32 __user *win;
-
- if (!reg)
- return 0;
- if (reg < 16) {
- regs->u_regs[reg] = result;
- return 0;
- } else {
- /* need to use put_user() in this case: */
- win = (struct reg_window32 __user *) regs->u_regs[UREG_FP];
- return (put_user(result, &win->locals[reg - 16]));
- }
-}
-
-/* Should return 0 if mul/div emulation succeeded and SIGILL should
- * not be issued.
- */
-int do_user_muldiv(struct pt_regs *regs, unsigned long pc)
-{
- unsigned int insn;
- int inst;
- unsigned int rs1, rs2, rdv;
-
- if (!pc)
- return -1; /* This happens to often, I think */
- if (get_user (insn, (unsigned int __user *)pc))
- return -1;
- if ((insn & 0xc1400000) != 0x80400000)
- return -1;
- inst = ((insn >> 19) & 0xf);
- if ((inst & 0xe) != 10 && (inst & 0xe) != 14)
- return -1;
-
- /* Now we know we have to do something with umul, smul, udiv or sdiv */
- rs1 = (insn >> 14) & 0x1f;
- rs2 = insn & 0x1f;
- rdv = (insn >> 25) & 0x1f;
- if (has_imm13(insn)) {
- maybe_flush_windows(rs1, 0, rdv);
- rs2 = sign_extend_imm13(insn);
- } else {
- maybe_flush_windows(rs1, rs2, rdv);
- rs2 = fetch_reg(rs2, regs);
- }
- rs1 = fetch_reg(rs1, regs);
- switch (inst) {
- case 10: /* umul */
-#ifdef DEBUG_MULDIV
- printk ("unsigned muldiv: 0x%x * 0x%x = ", rs1, rs2);
-#endif
- __asm__ __volatile__ ("\n\t"
- "mov %0, %%o0\n\t"
- "call .umul\n\t"
- " mov %1, %%o1\n\t"
- "mov %%o0, %0\n\t"
- "mov %%o1, %1\n\t"
- : "=r" (rs1), "=r" (rs2)
- : "0" (rs1), "1" (rs2)
- : "o0", "o1", "o2", "o3", "o4", "o5", "o7", "cc");
-#ifdef DEBUG_MULDIV
- printk ("0x%x%08x\n", rs2, rs1);
-#endif
- if (store_reg(rs1, rdv, regs))
- return -1;
- regs->y = rs2;
- break;
- case 11: /* smul */
-#ifdef DEBUG_MULDIV
- printk ("signed muldiv: 0x%x * 0x%x = ", rs1, rs2);
-#endif
- __asm__ __volatile__ ("\n\t"
- "mov %0, %%o0\n\t"
- "call .mul\n\t"
- " mov %1, %%o1\n\t"
- "mov %%o0, %0\n\t"
- "mov %%o1, %1\n\t"
- : "=r" (rs1), "=r" (rs2)
- : "0" (rs1), "1" (rs2)
- : "o0", "o1", "o2", "o3", "o4", "o5", "o7", "cc");
-#ifdef DEBUG_MULDIV
- printk ("0x%x%08x\n", rs2, rs1);
-#endif
- if (store_reg(rs1, rdv, regs))
- return -1;
- regs->y = rs2;
- break;
- case 14: /* udiv */
-#ifdef DEBUG_MULDIV
- printk ("unsigned muldiv: 0x%x%08x / 0x%x = ", regs->y, rs1, rs2);
-#endif
- if (!rs2) {
-#ifdef DEBUG_MULDIV
- printk ("DIVISION BY ZERO\n");
-#endif
- handle_hw_divzero (regs, pc, regs->npc, regs->psr);
- return 0;
- }
- __asm__ __volatile__ ("\n\t"
- "mov %2, %%o0\n\t"
- "mov %0, %%o1\n\t"
- "mov %%g0, %%o2\n\t"
- "call __udivdi3\n\t"
- " mov %1, %%o3\n\t"
- "mov %%o1, %0\n\t"
- "mov %%o0, %1\n\t"
- : "=r" (rs1), "=r" (rs2)
- : "r" (regs->y), "0" (rs1), "1" (rs2)
- : "o0", "o1", "o2", "o3", "o4", "o5", "o7",
- "g1", "g2", "g3", "cc");
-#ifdef DEBUG_MULDIV
- printk ("0x%x\n", rs1);
-#endif
- if (store_reg(rs1, rdv, regs))
- return -1;
- break;
- case 15: /* sdiv */
-#ifdef DEBUG_MULDIV
- printk ("signed muldiv: 0x%x%08x / 0x%x = ", regs->y, rs1, rs2);
-#endif
- if (!rs2) {
-#ifdef DEBUG_MULDIV
- printk ("DIVISION BY ZERO\n");
-#endif
- handle_hw_divzero (regs, pc, regs->npc, regs->psr);
- return 0;
- }
- __asm__ __volatile__ ("\n\t"
- "mov %2, %%o0\n\t"
- "mov %0, %%o1\n\t"
- "mov %%g0, %%o2\n\t"
- "call __divdi3\n\t"
- " mov %1, %%o3\n\t"
- "mov %%o1, %0\n\t"
- "mov %%o0, %1\n\t"
- : "=r" (rs1), "=r" (rs2)
- : "r" (regs->y), "0" (rs1), "1" (rs2)
- : "o0", "o1", "o2", "o3", "o4", "o5", "o7",
- "g1", "g2", "g3", "cc");
-#ifdef DEBUG_MULDIV
- printk ("0x%x\n", rs1);
-#endif
- if (store_reg(rs1, rdv, regs))
- return -1;
- break;
- }
- if (is_foocc (insn)) {
- regs->psr &= ~PSR_ICC;
- if ((inst & 0xe) == 14) {
- /* ?div */
- if (rs2) regs->psr |= PSR_V;
- }
- if (!rs1) regs->psr |= PSR_Z;
- if (((int)rs1) < 0) regs->psr |= PSR_N;
-#ifdef DEBUG_MULDIV
- printk ("psr muldiv: %08x\n", regs->psr);
-#endif
- }
- advance(regs);
- return 0;
-}
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