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/* $Id: unaligned.c,v 1.23 2001/04/09 04:29:03 davem Exp $
* 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) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.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/smp_lock.h>
#include <asm/fpumacro.h>
#include <asm/bitops.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.kregs);
}
}
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 (current->thread.flags & SPARC_FLAG_32BIT) {
struct reg_window32 *win32;
win32 = (struct reg_window32 *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
get_user(value, &win32->locals[reg - 16]);
} else {
struct reg_window *win;
win = (struct reg_window *)(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 ®s->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 (current->thread.flags & SPARC_FLAG_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];
}
}
static inline 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 unaligned_panic(char *str, struct pt_regs *regs)
{
die_if_kernel(str, regs);
}
#define do_integer_load(dest_reg, size, saddr, is_signed, asi, errh) ({ \
__asm__ __volatile__ ( \
"wr %4, 0, %%asi\n\t" \
"cmp %1, 8\n\t" \
"bge,pn %%icc, 9f\n\t" \
" cmp %1, 4\n\t" \
"be,pt %%icc, 6f\n" \
"4:\t" " lduba [%2] %%asi, %%l1\n" \
"5:\t" "lduba [%2 + 1] %%asi, %%l2\n\t" \
"sll %%l1, 8, %%l1\n\t" \
"brz,pt %3, 3f\n\t" \
" add %%l1, %%l2, %%l1\n\t" \
"sllx %%l1, 48, %%l1\n\t" \
"srax %%l1, 48, %%l1\n" \
"3:\t" "ba,pt %%xcc, 0f\n\t" \
" stx %%l1, [%0]\n" \
"6:\t" "lduba [%2 + 1] %%asi, %%l2\n\t" \
"sll %%l1, 24, %%l1\n" \
"7:\t" "lduba [%2 + 2] %%asi, %%g7\n\t" \
"sll %%l2, 16, %%l2\n" \
"8:\t" "lduba [%2 + 3] %%asi, %%g1\n\t" \
"sll %%g7, 8, %%g7\n\t" \
"or %%l1, %%l2, %%l1\n\t" \
"or %%g7, %%g1, %%g7\n\t" \
"or %%l1, %%g7, %%l1\n\t" \
"brnz,a,pt %3, 3f\n\t" \
" sra %%l1, 0, %%l1\n" \
"3:\t" "ba,pt %%xcc, 0f\n\t" \
" stx %%l1, [%0]\n" \
"9:\t" "lduba [%2] %%asi, %%l1\n" \
"10:\t" "lduba [%2 + 1] %%asi, %%l2\n\t" \
"sllx %%l1, 56, %%l1\n" \
"11:\t" "lduba [%2 + 2] %%asi, %%g7\n\t" \
"sllx %%l2, 48, %%l2\n" \
"12:\t" "lduba [%2 + 3] %%asi, %%g1\n\t" \
"sllx %%g7, 40, %%g7\n\t" \
"sllx %%g1, 32, %%g1\n\t" \
"or %%l1, %%l2, %%l1\n\t" \
"or %%g7, %%g1, %%g7\n" \
"13:\t" "lduba [%2 + 4] %%asi, %%l2\n\t" \
"or %%l1, %%g7, %%g7\n" \
"14:\t" "lduba [%2 + 5] %%asi, %%g1\n\t" \
"sllx %%l2, 24, %%l2\n" \
"15:\t" "lduba [%2 + 6] %%asi, %%l1\n\t" \
"sllx %%g1, 16, %%g1\n\t" \
"or %%g7, %%l2, %%g7\n" \
"16:\t" "lduba [%2 + 7] %%asi, %%l2\n\t" \
"sllx %%l1, 8, %%l1\n\t" \
"or %%g7, %%g1, %%g7\n\t" \
"or %%l1, %%l2, %%l1\n\t" \
"or %%g7, %%l1, %%g7\n\t" \
"cmp %1, 8\n\t" \
"be,a,pt %%icc, 0f\n\t" \
" stx %%g7, [%0]\n\t" \
"srlx %%g7, 32, %%l1\n\t" \
"sra %%g7, 0, %%g7\n\t" \
"stx %%l1, [%0]\n\t" \
"stx %%g7, [%0 + 8]\n" \
"0:\n\t" \
"wr %%g0, %5, %%asi\n\n\t" \
".section __ex_table\n\t" \
".word 4b, " #errh "\n\t" \
".word 5b, " #errh "\n\t" \
".word 6b, " #errh "\n\t" \
".word 7b, " #errh "\n\t" \
".word 8b, " #errh "\n\t" \
".word 9b, " #errh "\n\t" \
".word 10b, " #errh "\n\t" \
".word 11b, " #errh "\n\t" \
".word 12b, " #errh "\n\t" \
".word 13b, " #errh "\n\t" \
".word 14b, " #errh "\n\t" \
".word 15b, " #errh "\n\t" \
".word 16b, " #errh "\n\n\t" \
".previous\n\t" \
: : "r" (dest_reg), "r" (size), "r" (saddr), "r" (is_signed), \
"r" (asi), "i" (ASI_AIUS) \
: "l1", "l2", "g7", "g1", "cc"); \
})
#define store_common(dst_addr, size, src_val, asi, errh) ({ \
__asm__ __volatile__ ( \
"wr %3, 0, %%asi\n\t" \
"ldx [%2], %%l1\n" \
"cmp %1, 2\n\t" \
"be,pn %%icc, 2f\n\t" \
" cmp %1, 4\n\t" \
"be,pt %%icc, 1f\n\t" \
" srlx %%l1, 24, %%l2\n\t" \
"srlx %%l1, 56, %%g1\n\t" \
"srlx %%l1, 48, %%g7\n" \
"4:\t" "stba %%g1, [%0] %%asi\n\t" \
"srlx %%l1, 40, %%g1\n" \
"5:\t" "stba %%g7, [%0 + 1] %%asi\n\t" \
"srlx %%l1, 32, %%g7\n" \
"6:\t" "stba %%g1, [%0 + 2] %%asi\n" \
"7:\t" "stba %%g7, [%0 + 3] %%asi\n\t" \
"srlx %%l1, 16, %%g1\n" \
"8:\t" "stba %%l2, [%0 + 4] %%asi\n\t" \
"srlx %%l1, 8, %%g7\n" \
"9:\t" "stba %%g1, [%0 + 5] %%asi\n" \
"10:\t" "stba %%g7, [%0 + 6] %%asi\n\t" \
"ba,pt %%xcc, 0f\n" \
"11:\t" " stba %%l1, [%0 + 7] %%asi\n" \
"1:\t" "srl %%l1, 16, %%g7\n" \
"12:\t" "stba %%l2, [%0] %%asi\n\t" \
"srl %%l1, 8, %%l2\n" \
"13:\t" "stba %%g7, [%0 + 1] %%asi\n" \
"14:\t" "stba %%l2, [%0 + 2] %%asi\n\t" \
"ba,pt %%xcc, 0f\n" \
"15:\t" " stba %%l1, [%0 + 3] %%asi\n" \
"2:\t" "srl %%l1, 8, %%l2\n" \
"16:\t" "stba %%l2, [%0] %%asi\n" \
"17:\t" "stba %%l1, [%0 + 1] %%asi\n" \
"0:\n\t" \
"wr %%g0, %4, %%asi\n\n\t" \
".section __ex_table\n\t" \
".word 4b, " #errh "\n\t" \
".word 5b, " #errh "\n\t" \
".word 6b, " #errh "\n\t" \
".word 7b, " #errh "\n\t" \
".word 8b, " #errh "\n\t" \
".word 9b, " #errh "\n\t" \
".word 10b, " #errh "\n\t" \
".word 11b, " #errh "\n\t" \
".word 12b, " #errh "\n\t" \
".word 13b, " #errh "\n\t" \
".word 14b, " #errh "\n\t" \
".word 15b, " #errh "\n\t" \
".word 16b, " #errh "\n\t" \
".word 17b, " #errh "\n\n\t" \
".previous\n\t" \
: : "r" (dst_addr), "r" (size), "r" (src_val), "r" (asi), "i" (ASI_AIUS)\
: "l1", "l2", "g7", "g1", "cc"); \
})
#define do_integer_store(reg_num, size, dst_addr, regs, asi, errh) ({ \
unsigned long zero = 0; \
unsigned long *src_val = &zero; \
\
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 = fetch_reg_addr(reg_num, regs); \
store_common(dst_addr, size, src_val, asi, errh); \
})
/* XXX Need to capture/release other cpu's for SMP around this. */
#define do_atomic(srcdest_reg, mem, errh) ({ \
unsigned long flags, tmp; \
\
save_and_cli(flags); \
tmp = *srcdest_reg; \
do_integer_load(srcdest_reg, 4, mem, 0, errh); \
store_common(mem, 4, &tmp, errh); \
restore_flags(flags); \
})
static inline void advance(struct pt_regs *regs)
{
regs->tpc = regs->tnpc;
regs->tnpc += 4;
if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
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);
}
void kernel_mna_trap_fault(struct pt_regs *regs, unsigned int insn) __asm__ ("kernel_mna_trap_fault");
void kernel_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
{
unsigned long g2 = regs->u_regs [UREG_G2];
unsigned long fixup = search_exception_table (regs->tpc, &g2);
if (!fixup) {
unsigned long 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->{mm,active_mm}->context = %016lx\n",
(current->mm ? current->mm->context :
current->active_mm->context));
printk(KERN_ALERT "current->{mm,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 = fixup;
regs->tnpc = regs->tpc + 4;
regs->u_regs [UREG_G2] = g2;
regs->tstate &= ~TSTATE_ASI;
regs->tstate |= (ASI_AIUS << 24UL);
}
asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn, unsigned long sfar, unsigned long sfsr)
{
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 <%016lx>.\n",
regs->tpc);
unaligned_panic("Kernel does fpu/atomic unaligned load/store.", regs);
__asm__ __volatile__ ("\n"
"kernel_unaligned_trap_fault:\n\t"
"mov %0, %%o0\n\t"
"call kernel_mna_trap_fault\n\t"
" mov %1, %%o1\n\t"
:
: "r" (regs), "r" (insn)
: "o0", "o1", "o2", "o3", "o4", "o5", "o7",
"g1", "g2", "g3", "g4", "g5", "g7", "cc");
} else {
unsigned long 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(dir) {
case load:
do_integer_load(fetch_reg_addr(((insn>>25)&0x1f), regs),
size, (unsigned long *) addr,
decode_signedness(insn), decode_asi(insn, regs),
kernel_unaligned_trap_fault);
break;
case store:
do_integer_store(((insn>>25)&0x1f), size,
(unsigned long *) addr, regs,
decode_asi(insn, regs),
kernel_unaligned_trap_fault);
break;
#if 0 /* unsupported */
case both:
do_atomic(fetch_reg_addr(((insn>>25)&0x1f), regs),
(unsigned long *) addr,
kernel_unaligned_trap_fault);
break;
#endif
default:
panic("Impossible kernel unaligned trap.");
/* Not reached... */
}
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 (current->thread.flags & SPARC_FLAG_32BIT) {
struct reg_window32 *win32;
win32 = (struct reg_window32 *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
put_user(ret, &win32->locals[rd - 16]);
} else {
struct reg_window *win;
win = (struct reg_window *)(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 data_access_exception(struct pt_regs *regs);
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.xfsr[0] &= ~0x1c000;
if (freg & 3) {
current->thread.xfsr[0] |= (6 << 14) /* invalid_fp_register */;
do_fpother(regs);
return 0;
}
if (insn & 0x200000) {
/* STQ */
u64 first = 0, second = 0;
if (current->thread.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:
data_access_exception(regs);
return 1;
}
if (put_user (first >> 32, (u32 *)addr) ||
__put_user ((u32)first, (u32 *)(addr + 4)) ||
__put_user (second >> 32, (u32 *)(addr + 8)) ||
__put_user ((u32)second, (u32 *)(addr + 12))) {
data_access_exception(regs);
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) {
data_access_exception(regs);
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 *)addr);
if (!err) {
for (i = 1; i < size; i++)
err |= __get_user (data[i], (u32 *)(addr + 4*i));
}
if (err && !(asi & 0x2 /* NF */)) {
data_access_exception(regs);
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.fpsaved[0] & FPRS_FEF)) {
current->thread.fpsaved[0] = FPRS_FEF;
current->thread.gsr[0] = 0;
}
if (!(current->thread.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.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 (current->thread.flags & SPARC_FLAG_32BIT) {
put_user(0, (int *)reg);
if ((insn & 0x780000) == 0x180000)
put_user(0, ((int *)reg) + 1);
} else {
put_user(0, reg);
if ((insn & 0x780000) == 0x180000)
put_user(0, 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 asi, freg;
int flag;
struct fpustate *f = FPUSTATE;
if(tstate & TSTATE_PRIV)
die_if_kernel("lddfmna from kernel", regs);
if(current->thread.flags & SPARC_FLAG_32BIT)
pc = (u32)pc;
if (get_user(insn, (u32 *)pc) != -EFAULT) {
asi = sfsr >> 16;
if ((asi > ASI_SNFL) ||
(asi < ASI_P))
goto daex;
if (get_user(first, (u32 *)sfar) ||
get_user(second, (u32 *)(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.fpsaved[0] & FPRS_FEF)) {
current->thread.fpsaved[0] = FPRS_FEF;
current->thread.gsr[0] = 0;
}
if (!(current->thread.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.fpsaved[0] |= flag;
} else {
daex: data_access_exception(regs);
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 asi, freg;
int flag;
struct fpustate *f = FPUSTATE;
if(tstate & TSTATE_PRIV)
die_if_kernel("stdfmna from kernel", regs);
if(current->thread.flags & SPARC_FLAG_32BIT)
pc = (u32)pc;
if (get_user(insn, (u32 *)pc) != -EFAULT) {
freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20);
asi = sfsr >> 16;
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.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 *)sfar) ||
__put_user ((u32)value, (u32 *)(sfar + 4)))
goto daex;
} else {
daex: data_access_exception(regs);
return;
}
advance(regs);
return;
}
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