dsemul.c (9a64e8e0ace51b309fdcff4b4754b3649250382a) dsemul.c (102cedc32a6e3cd537374a3678d407591d5a6fab)
1#include <linux/compiler.h>
2#include <linux/mm.h>
3#include <linux/signal.h>
4#include <linux/smp.h>
5
6#include <asm/asm.h>
7#include <asm/bootinfo.h>
8#include <asm/byteorder.h>

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50};
51
52int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
53{
54 extern asmlinkage void handle_dsemulret(void);
55 struct emuframe __user *fr;
56 int err;
57
1#include <linux/compiler.h>
2#include <linux/mm.h>
3#include <linux/signal.h>
4#include <linux/smp.h>
5
6#include <asm/asm.h>
7#include <asm/bootinfo.h>
8#include <asm/byteorder.h>

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50};
51
52int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
53{
54 extern asmlinkage void handle_dsemulret(void);
55 struct emuframe __user *fr;
56 int err;
57
58 if (ir == 0) { /* a nop is easy */
58 if ((get_isa16_mode(regs->cp0_epc) && ((ir >> 16) == MM_NOP16)) ||
59 (ir == 0)) {
60 /* NOP is easy */
59 regs->cp0_epc = cpc;
60 regs->cp0_cause &= ~CAUSEF_BD;
61 return 0;
62 }
63#ifdef DSEMUL_TRACE
64 printk("dsemul %lx %lx\n", regs->cp0_epc, cpc);
65
66#endif

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86 /* Ensure that the two instructions are in the same cache line */
87 fr = (struct emuframe __user *)
88 ((regs->regs[29] - sizeof(struct emuframe)) & ~0x7);
89
90 /* Verify that the stack pointer is not competely insane */
91 if (unlikely(!access_ok(VERIFY_WRITE, fr, sizeof(struct emuframe))))
92 return SIGBUS;
93
61 regs->cp0_epc = cpc;
62 regs->cp0_cause &= ~CAUSEF_BD;
63 return 0;
64 }
65#ifdef DSEMUL_TRACE
66 printk("dsemul %lx %lx\n", regs->cp0_epc, cpc);
67
68#endif

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88 /* Ensure that the two instructions are in the same cache line */
89 fr = (struct emuframe __user *)
90 ((regs->regs[29] - sizeof(struct emuframe)) & ~0x7);
91
92 /* Verify that the stack pointer is not competely insane */
93 if (unlikely(!access_ok(VERIFY_WRITE, fr, sizeof(struct emuframe))))
94 return SIGBUS;
95
94 err = __put_user(ir, &fr->emul);
95 err |= __put_user((mips_instruction)BREAK_MATH, &fr->badinst);
96 if (get_isa16_mode(regs->cp0_epc)) {
97 err = __put_user(ir >> 16, (u16 __user *)(&fr->emul));
98 err |= __put_user(ir & 0xffff, (u16 __user *)((long)(&fr->emul) + 2));
99 err |= __put_user(BREAK_MATH >> 16, (u16 __user *)(&fr->badinst));
100 err |= __put_user(BREAK_MATH & 0xffff, (u16 __user *)((long)(&fr->badinst) + 2));
101 } else {
102 err = __put_user(ir, &fr->emul);
103 err |= __put_user((mips_instruction)BREAK_MATH, &fr->badinst);
104 }
105
96 err |= __put_user((mips_instruction)BD_COOKIE, &fr->cookie);
97 err |= __put_user(cpc, &fr->epc);
98
99 if (unlikely(err)) {
100 MIPS_FPU_EMU_INC_STATS(errors);
101 return SIGBUS;
102 }
103
106 err |= __put_user((mips_instruction)BD_COOKIE, &fr->cookie);
107 err |= __put_user(cpc, &fr->epc);
108
109 if (unlikely(err)) {
110 MIPS_FPU_EMU_INC_STATS(errors);
111 return SIGBUS;
112 }
113
104 regs->cp0_epc = (unsigned long) &fr->emul;
114 regs->cp0_epc = ((unsigned long) &fr->emul) |
115 get_isa16_mode(regs->cp0_epc);
105
106 flush_cache_sigtramp((unsigned long)&fr->badinst);
107
108 return SIGILL; /* force out of emulation loop */
109}
110
111int do_dsemulret(struct pt_regs *xcp)
112{
113 struct emuframe __user *fr;
114 unsigned long epc;
115 u32 insn, cookie;
116 int err = 0;
116
117 flush_cache_sigtramp((unsigned long)&fr->badinst);
118
119 return SIGILL; /* force out of emulation loop */
120}
121
122int do_dsemulret(struct pt_regs *xcp)
123{
124 struct emuframe __user *fr;
125 unsigned long epc;
126 u32 insn, cookie;
127 int err = 0;
128 u16 instr[2];
117
118 fr = (struct emuframe __user *)
129
130 fr = (struct emuframe __user *)
119 (xcp->cp0_epc - sizeof(mips_instruction));
131 (msk_isa16_mode(xcp->cp0_epc) - sizeof(mips_instruction));
120
121 /*
122 * If we can't even access the area, something is very wrong, but we'll
123 * leave that to the default handling
124 */
125 if (!access_ok(VERIFY_READ, fr, sizeof(struct emuframe)))
126 return 0;
127
128 /*
129 * Do some sanity checking on the stackframe:
130 *
131 * - Is the instruction pointed to by the EPC an BREAK_MATH?
132 * - Is the following memory word the BD_COOKIE?
133 */
132
133 /*
134 * If we can't even access the area, something is very wrong, but we'll
135 * leave that to the default handling
136 */
137 if (!access_ok(VERIFY_READ, fr, sizeof(struct emuframe)))
138 return 0;
139
140 /*
141 * Do some sanity checking on the stackframe:
142 *
143 * - Is the instruction pointed to by the EPC an BREAK_MATH?
144 * - Is the following memory word the BD_COOKIE?
145 */
134 err = __get_user(insn, &fr->badinst);
146 if (get_isa16_mode(xcp->cp0_epc)) {
147 err = __get_user(instr[0], (u16 __user *)(&fr->badinst));
148 err |= __get_user(instr[1], (u16 __user *)((long)(&fr->badinst) + 2));
149 insn = (instr[0] << 16) | instr[1];
150 } else {
151 err = __get_user(insn, &fr->badinst);
152 }
135 err |= __get_user(cookie, &fr->cookie);
136
137 if (unlikely(err || (insn != BREAK_MATH) || (cookie != BD_COOKIE))) {
138 MIPS_FPU_EMU_INC_STATS(errors);
139 return 0;
140 }
141
142 /*

--- 24 unchanged lines hidden --- 		153 err |= __get_user(cookie, &fr->cookie);
154
155 if (unlikely(err || (insn != BREAK_MATH) || (cookie != BD_COOKIE))) {
156 MIPS_FPU_EMU_INC_STATS(errors);
157 return 0;
158 }
159
160 /*

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