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WSL2-Linux-Kernel
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MIPS: kernel: unaligned: Add support for the MIPS R6 

The load/store unaligned instructions have been removed in MIPS R6
so we need to re-implement the related macros using the regular
load/store instructions. Moreover, the load/store from coprocessor 2
instructions have been reallocated in Release 6 so we will handle them
in the emulator instead.

Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
This commit is contained in:
Leonid Yegoshin 2014-10-28 10:42:23 +00:00 коммит произвёл Markos Chandras
Родитель acac4108df
Коммит 0593a44c64
1 изменённых файлов: 386 добавлений и 4 удалений
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390
arch/mips/kernel/unaligned.c
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@ -129,6 +129,7 @@ extern void show_registers(struct pt_regs *regs);
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#ifndef CONFIG_CPU_MIPSR6
#define LoadW(addr, value, res) \
__asm__ __volatile__ ( \
"1:\t"user_lwl("%0", "(%2)")"\n" \
@ -146,6 +147,39 @@ extern void show_registers(struct pt_regs *regs);
".previous" \
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#else
/* MIPSR6 has no lwl instruction */
#define LoadW(addr, value, res) \
__asm__ __volatile__ ( \
".set\tpush\n" \
".set\tnoat\n\t" \
"1:"user_lb("%0", "0(%2)")"\n\t" \
"2:"user_lbu("$1", "1(%2)")"\n\t" \
"sll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"3:"user_lbu("$1", "2(%2)")"\n\t" \
"sll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"4:"user_lbu("$1", "3(%2)")"\n\t" \
"sll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"li\t%1, 0\n" \
".set\tpop\n" \
"10:\n\t" \
".insn\n\t" \
".section\t.fixup,\"ax\"\n\t" \
"11:\tli\t%1, %3\n\t" \
"j\t10b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
STR(PTR)"\t1b, 11b\n\t" \
STR(PTR)"\t2b, 11b\n\t" \
STR(PTR)"\t3b, 11b\n\t" \
STR(PTR)"\t4b, 11b\n\t" \
".previous" \
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#endif /* CONFIG_CPU_MIPSR6 */
#define LoadHWU(addr, value, res) \
__asm__ __volatile__ ( \
@ -169,6 +203,7 @@ extern void show_registers(struct pt_regs *regs);
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#ifndef CONFIG_CPU_MIPSR6
#define LoadWU(addr, value, res) \
__asm__ __volatile__ ( \
"1:\t"user_lwl("%0", "(%2)")"\n" \
@ -206,6 +241,87 @@ extern void show_registers(struct pt_regs *regs);
".previous" \
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#else
/* MIPSR6 has not lwl and ldl instructions */
#define LoadWU(addr, value, res) \
__asm__ __volatile__ ( \
".set\tpush\n\t" \
".set\tnoat\n\t" \
"1:"user_lbu("%0", "0(%2)")"\n\t" \
"2:"user_lbu("$1", "1(%2)")"\n\t" \
"sll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"3:"user_lbu("$1", "2(%2)")"\n\t" \
"sll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"4:"user_lbu("$1", "3(%2)")"\n\t" \
"sll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"li\t%1, 0\n" \
".set\tpop\n" \
"10:\n\t" \
".insn\n\t" \
".section\t.fixup,\"ax\"\n\t" \
"11:\tli\t%1, %3\n\t" \
"j\t10b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
STR(PTR)"\t1b, 11b\n\t" \
STR(PTR)"\t2b, 11b\n\t" \
STR(PTR)"\t3b, 11b\n\t" \
STR(PTR)"\t4b, 11b\n\t" \
".previous" \
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#define LoadDW(addr, value, res) \
__asm__ __volatile__ ( \
".set\tpush\n\t" \
".set\tnoat\n\t" \
"1:lb\t%0, 0(%2)\n\t" \
"2:lbu\t $1, 1(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"3:lbu\t$1, 2(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"4:lbu\t$1, 3(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"5:lbu\t$1, 4(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"6:lbu\t$1, 5(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"7:lbu\t$1, 6(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"8:lbu\t$1, 7(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"li\t%1, 0\n" \
".set\tpop\n\t" \
"10:\n\t" \
".insn\n\t" \
".section\t.fixup,\"ax\"\n\t" \
"11:\tli\t%1, %3\n\t" \
"j\t10b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
STR(PTR)"\t1b, 11b\n\t" \
STR(PTR)"\t2b, 11b\n\t" \
STR(PTR)"\t3b, 11b\n\t" \
STR(PTR)"\t4b, 11b\n\t" \
STR(PTR)"\t5b, 11b\n\t" \
STR(PTR)"\t6b, 11b\n\t" \
STR(PTR)"\t7b, 11b\n\t" \
STR(PTR)"\t8b, 11b\n\t" \
".previous" \
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#endif /* CONFIG_CPU_MIPSR6 */
#define StoreHW(addr, value, res) \
__asm__ __volatile__ ( \
@ -228,6 +344,7 @@ extern void show_registers(struct pt_regs *regs);
: "=r" (res) \
: "r" (value), "r" (addr), "i" (-EFAULT));
#ifndef CONFIG_CPU_MIPSR6
#define StoreW(addr, value, res) \
__asm__ __volatile__ ( \
"1:\t"user_swl("%1", "(%2)")"\n" \
@ -263,9 +380,82 @@ extern void show_registers(struct pt_regs *regs);
".previous" \
: "=r" (res) \
: "r" (value), "r" (addr), "i" (-EFAULT));
#endif
#else
/* MIPSR6 has no swl and sdl instructions */
#define StoreW(addr, value, res) \
__asm__ __volatile__ ( \
".set\tpush\n\t" \
".set\tnoat\n\t" \
"1:"user_sb("%1", "3(%2)")"\n\t" \
"srl\t$1, %1, 0x8\n\t" \
"2:"user_sb("$1", "2(%2)")"\n\t" \
"srl\t$1, $1, 0x8\n\t" \
"3:"user_sb("$1", "1(%2)")"\n\t" \
"srl\t$1, $1, 0x8\n\t" \
"4:"user_sb("$1", "0(%2)")"\n\t" \
".set\tpop\n\t" \
"li\t%0, 0\n" \
"10:\n\t" \
".insn\n\t" \
".section\t.fixup,\"ax\"\n\t" \
"11:\tli\t%0, %3\n\t" \
"j\t10b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
STR(PTR)"\t1b, 11b\n\t" \
STR(PTR)"\t2b, 11b\n\t" \
STR(PTR)"\t3b, 11b\n\t" \
STR(PTR)"\t4b, 11b\n\t" \
".previous" \
: "=&r" (res) \
: "r" (value), "r" (addr), "i" (-EFAULT) \
: "memory");
#define StoreDW(addr, value, res) \
__asm__ __volatile__ ( \
".set\tpush\n\t" \
".set\tnoat\n\t" \
"1:sb\t%1, 7(%2)\n\t" \
"dsrl\t$1, %1, 0x8\n\t" \
"2:sb\t$1, 6(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
"3:sb\t$1, 5(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
"4:sb\t$1, 4(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
"5:sb\t$1, 3(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
"6:sb\t$1, 2(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
"7:sb\t$1, 1(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
"8:sb\t$1, 0(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
".set\tpop\n\t" \
"li\t%0, 0\n" \
"10:\n\t" \
".insn\n\t" \
".section\t.fixup,\"ax\"\n\t" \
"11:\tli\t%0, %3\n\t" \
"j\t10b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
STR(PTR)"\t1b, 11b\n\t" \
STR(PTR)"\t2b, 11b\n\t" \
STR(PTR)"\t3b, 11b\n\t" \
STR(PTR)"\t4b, 11b\n\t" \
STR(PTR)"\t5b, 11b\n\t" \
STR(PTR)"\t6b, 11b\n\t" \
STR(PTR)"\t7b, 11b\n\t" \
STR(PTR)"\t8b, 11b\n\t" \
".previous" \
: "=&r" (res) \
: "r" (value), "r" (addr), "i" (-EFAULT) \
: "memory");
#endif /* CONFIG_CPU_MIPSR6 */
#else /* __BIG_ENDIAN */
#ifdef __LITTLE_ENDIAN
#define LoadHW(addr, value, res) \
__asm__ __volatile__ (".set\tnoat\n" \
"1:\t"user_lb("%0", "1(%2)")"\n" \
@ -286,6 +476,7 @@ extern void show_registers(struct pt_regs *regs);
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#ifndef CONFIG_CPU_MIPSR6
#define LoadW(addr, value, res) \
__asm__ __volatile__ ( \
"1:\t"user_lwl("%0", "3(%2)")"\n" \
@ -303,6 +494,40 @@ extern void show_registers(struct pt_regs *regs);
".previous" \
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#else
/* MIPSR6 has no lwl instruction */
#define LoadW(addr, value, res) \
__asm__ __volatile__ ( \
".set\tpush\n" \
".set\tnoat\n\t" \
"1:"user_lb("%0", "3(%2)")"\n\t" \
"2:"user_lbu("$1", "2(%2)")"\n\t" \
"sll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"3:"user_lbu("$1", "1(%2)")"\n\t" \
"sll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"4:"user_lbu("$1", "0(%2)")"\n\t" \
"sll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"li\t%1, 0\n" \
".set\tpop\n" \
"10:\n\t" \
".insn\n\t" \
".section\t.fixup,\"ax\"\n\t" \
"11:\tli\t%1, %3\n\t" \
"j\t10b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
STR(PTR)"\t1b, 11b\n\t" \
STR(PTR)"\t2b, 11b\n\t" \
STR(PTR)"\t3b, 11b\n\t" \
STR(PTR)"\t4b, 11b\n\t" \
".previous" \
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#endif /* CONFIG_CPU_MIPSR6 */
#define LoadHWU(addr, value, res) \
__asm__ __volatile__ ( \
@ -326,6 +551,7 @@ extern void show_registers(struct pt_regs *regs);
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#ifndef CONFIG_CPU_MIPSR6
#define LoadWU(addr, value, res) \
__asm__ __volatile__ ( \
"1:\t"user_lwl("%0", "3(%2)")"\n" \
@ -363,6 +589,86 @@ extern void show_registers(struct pt_regs *regs);
".previous" \
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#else
/* MIPSR6 has not lwl and ldl instructions */
#define LoadWU(addr, value, res) \
__asm__ __volatile__ ( \
".set\tpush\n\t" \
".set\tnoat\n\t" \
"1:"user_lbu("%0", "3(%2)")"\n\t" \
"2:"user_lbu("$1", "2(%2)")"\n\t" \
"sll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"3:"user_lbu("$1", "1(%2)")"\n\t" \
"sll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"4:"user_lbu("$1", "0(%2)")"\n\t" \
"sll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"li\t%1, 0\n" \
".set\tpop\n" \
"10:\n\t" \
".insn\n\t" \
".section\t.fixup,\"ax\"\n\t" \
"11:\tli\t%1, %3\n\t" \
"j\t10b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
STR(PTR)"\t1b, 11b\n\t" \
STR(PTR)"\t2b, 11b\n\t" \
STR(PTR)"\t3b, 11b\n\t" \
STR(PTR)"\t4b, 11b\n\t" \
".previous" \
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#define LoadDW(addr, value, res) \
__asm__ __volatile__ ( \
".set\tpush\n\t" \
".set\tnoat\n\t" \
"1:lb\t%0, 7(%2)\n\t" \
"2:lbu\t$1, 6(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"3:lbu\t$1, 5(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"4:lbu\t$1, 4(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"5:lbu\t$1, 3(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"6:lbu\t$1, 2(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"7:lbu\t$1, 1(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"8:lbu\t$1, 0(%2)\n\t" \
"dsll\t%0, 0x8\n\t" \
"or\t%0, $1\n\t" \
"li\t%1, 0\n" \
".set\tpop\n\t" \
"10:\n\t" \
".insn\n\t" \
".section\t.fixup,\"ax\"\n\t" \
"11:\tli\t%1, %3\n\t" \
"j\t10b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
STR(PTR)"\t1b, 11b\n\t" \
STR(PTR)"\t2b, 11b\n\t" \
STR(PTR)"\t3b, 11b\n\t" \
STR(PTR)"\t4b, 11b\n\t" \
STR(PTR)"\t5b, 11b\n\t" \
STR(PTR)"\t6b, 11b\n\t" \
STR(PTR)"\t7b, 11b\n\t" \
STR(PTR)"\t8b, 11b\n\t" \
".previous" \
: "=&r" (value), "=r" (res) \
: "r" (addr), "i" (-EFAULT));
#endif /* CONFIG_CPU_MIPSR6 */
#define StoreHW(addr, value, res) \
__asm__ __volatile__ ( \
@ -384,7 +690,7 @@ extern void show_registers(struct pt_regs *regs);
".previous" \
: "=r" (res) \
: "r" (value), "r" (addr), "i" (-EFAULT));
#ifndef CONFIG_CPU_MIPSR6
#define StoreW(addr, value, res) \
__asm__ __volatile__ ( \
"1:\t"user_swl("%1", "3(%2)")"\n" \
@ -420,6 +726,79 @@ extern void show_registers(struct pt_regs *regs);
".previous" \
: "=r" (res) \
: "r" (value), "r" (addr), "i" (-EFAULT));
#else
/* MIPSR6 has no swl and sdl instructions */
#define StoreW(addr, value, res) \
__asm__ __volatile__ ( \
".set\tpush\n\t" \
".set\tnoat\n\t" \
"1:"user_sb("%1", "0(%2)")"\n\t" \
"srl\t$1, %1, 0x8\n\t" \
"2:"user_sb("$1", "1(%2)")"\n\t" \
"srl\t$1, $1, 0x8\n\t" \
"3:"user_sb("$1", "2(%2)")"\n\t" \
"srl\t$1, $1, 0x8\n\t" \
"4:"user_sb("$1", "3(%2)")"\n\t" \
".set\tpop\n\t" \
"li\t%0, 0\n" \
"10:\n\t" \
".insn\n\t" \
".section\t.fixup,\"ax\"\n\t" \
"11:\tli\t%0, %3\n\t" \
"j\t10b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
STR(PTR)"\t1b, 11b\n\t" \
STR(PTR)"\t2b, 11b\n\t" \
STR(PTR)"\t3b, 11b\n\t" \
STR(PTR)"\t4b, 11b\n\t" \
".previous" \
: "=&r" (res) \
: "r" (value), "r" (addr), "i" (-EFAULT) \
: "memory");
#define StoreDW(addr, value, res) \
__asm__ __volatile__ ( \
".set\tpush\n\t" \
".set\tnoat\n\t" \
"1:sb\t%1, 0(%2)\n\t" \
"dsrl\t$1, %1, 0x8\n\t" \
"2:sb\t$1, 1(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
"3:sb\t$1, 2(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
"4:sb\t$1, 3(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
"5:sb\t$1, 4(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
"6:sb\t$1, 5(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
"7:sb\t$1, 6(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
"8:sb\t$1, 7(%2)\n\t" \
"dsrl\t$1, $1, 0x8\n\t" \
".set\tpop\n\t" \
"li\t%0, 0\n" \
"10:\n\t" \
".insn\n\t" \
".section\t.fixup,\"ax\"\n\t" \
"11:\tli\t%0, %3\n\t" \
"j\t10b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
STR(PTR)"\t1b, 11b\n\t" \
STR(PTR)"\t2b, 11b\n\t" \
STR(PTR)"\t3b, 11b\n\t" \
STR(PTR)"\t4b, 11b\n\t" \
STR(PTR)"\t5b, 11b\n\t" \
STR(PTR)"\t6b, 11b\n\t" \
STR(PTR)"\t7b, 11b\n\t" \
STR(PTR)"\t8b, 11b\n\t" \
".previous" \
: "=&r" (res) \
: "r" (value), "r" (addr), "i" (-EFAULT) \
: "memory");
#endif /* CONFIG_CPU_MIPSR6 */
#endif
static void emulate_load_store_insn(struct pt_regs *regs,
@ -703,10 +1082,13 @@ static void emulate_load_store_insn(struct pt_regs *regs,
break;
return;
#ifndef CONFIG_CPU_MIPSR6
/*
* COP2 is available to implementor for application specific use.
* It's up to applications to register a notifier chain and do
* whatever they have to do, including possible sending of signals.
*
* This instruction has been reallocated in Release 6
*/
case lwc2_op:
cu2_notifier_call_chain(CU2_LWC2_OP, regs);
@ -723,7 +1105,7 @@ static void emulate_load_store_insn(struct pt_regs *regs,
case sdc2_op:
cu2_notifier_call_chain(CU2_SDC2_OP, regs);
break;
#endif
default:
/*
* Pheeee... We encountered an yet unknown instruction or