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[SPARC64]: Move kernel unaligned trap handlers into assembler file. 

GCC 4.x really dislikes the games we are playing in
unaligned.c, and the cleanest way to fix this is to
move things into assembler.

Noted by Al Viro.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2005-08-19 15:55:33 -07:00
parent 8d5290149e
commit a3f9985843
5 changed files with 218 additions and 200 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/sparc64/kernel/Makefile
View File

@ -8,7 +8,7 @@ EXTRA_CFLAGS := -Werror
extra-y := head.o init_task.o vmlinux.lds
obj-y := process.o setup.o cpu.o idprom.o \
traps.o devices.o auxio.o \
traps.o devices.o auxio.o una_asm.o \
irq.o ptrace.o time.o sys_sparc.o signal.o \
unaligned.o central.o pci.o starfire.o semaphore.o \
power.o sbus.o iommu_common.o sparc64_ksyms.o chmc.o

3
arch/sparc64/kernel/traps.c
View File

@ -2127,6 +2127,9 @@ void __init trap_init(void)
TI_PRE_COUNT != offsetof(struct thread_info, preempt_count) ||
TI_NEW_CHILD != offsetof(struct thread_info, new_child) ||
TI_SYS_NOERROR != offsetof(struct thread_info, syscall_noerror) ||
TI_RESTART_BLOCK != offsetof(struct thread_info, restart_block) ||
TI_KUNA_REGS != offsetof(struct thread_info, kern_una_regs) ||
TI_KUNA_INSN != offsetof(struct thread_info, kern_una_insn) ||
TI_FPREGS != offsetof(struct thread_info, fpregs) ||
(TI_FPREGS & (64 - 1)))
thread_info_offsets_are_bolixed_dave();

153
arch/sparc64/kernel/una_asm.S Normal file
View File

@ -0,0 +1,153 @@
/* una_asm.S: Kernel unaligned trap assembler helpers.
*
* Copyright (C) 1996,2005 David S. Miller (davem@davemloft.net)
* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
.text
kernel_unaligned_trap_fault:
call kernel_mna_trap_fault
nop
retl
nop
.size kern_unaligned_trap_fault, .-kern_unaligned_trap_fault
.globl __do_int_store
__do_int_store:
rd %asi, %o4
wr %o3, 0, %asi
ldx [%o2], %g3
cmp %o1, 2
be,pn %icc, 2f
cmp %o1, 4
be,pt %icc, 1f
srlx %g3, 24, %g2
srlx %g3, 56, %g1
srlx %g3, 48, %g7
4: stba %g1, [%o0] %asi
srlx %g3, 40, %g1
5: stba %g7, [%o0 + 1] %asi
srlx %g3, 32, %g7
6: stba %g1, [%o0 + 2] %asi
7: stba %g7, [%o0 + 3] %asi
srlx %g3, 16, %g1
8: stba %g2, [%o0 + 4] %asi
srlx %g3, 8, %g7
9: stba %g1, [%o0 + 5] %asi
10: stba %g7, [%o0 + 6] %asi
ba,pt %xcc, 0f
11: stba %g3, [%o0 + 7] %asi
1: srl %g3, 16, %g7
12: stba %g2, [%o0] %asi
srl %g3, 8, %g2
13: stba %g7, [%o0 + 1] %asi
14: stba %g2, [%o0 + 2] %asi
ba,pt %xcc, 0f
15: stba %g3, [%o0 + 3] %asi
2: srl %g3, 8, %g2
16: stba %g2, [%o0] %asi
17: stba %g3, [%o0 + 1] %asi
0:
wr %o4, 0x0, %asi
retl
nop
.size __do_int_store, .-__do_int_store
.section __ex_table
.word 4b, kernel_unaligned_trap_fault
.word 5b, kernel_unaligned_trap_fault
.word 6b, kernel_unaligned_trap_fault
.word 7b, kernel_unaligned_trap_fault
.word 8b, kernel_unaligned_trap_fault
.word 9b, kernel_unaligned_trap_fault
.word 10b, kernel_unaligned_trap_fault
.word 11b, kernel_unaligned_trap_fault
.word 12b, kernel_unaligned_trap_fault
.word 13b, kernel_unaligned_trap_fault
.word 14b, kernel_unaligned_trap_fault
.word 15b, kernel_unaligned_trap_fault
.word 16b, kernel_unaligned_trap_fault
.word 17b, kernel_unaligned_trap_fault
.previous
.globl do_int_load
do_int_load:
rd %asi, %o5
wr %o4, 0, %asi
cmp %o1, 8
bge,pn %icc, 9f
cmp %o1, 4
be,pt %icc, 6f
4: lduba [%o2] %asi, %g2
5: lduba [%o2 + 1] %asi, %g3
sll %g2, 8, %g2
brz,pt %o3, 3f
add %g2, %g3, %g2
sllx %g2, 48, %g2
srax %g2, 48, %g2
3: ba,pt %xcc, 0f
stx %g2, [%o0]
6: lduba [%o2 + 1] %asi, %g3
sll %g2, 24, %g2
7: lduba [%o2 + 2] %asi, %g7
sll %g3, 16, %g3
8: lduba [%o2 + 3] %asi, %g1
sll %g7, 8, %g7
or %g2, %g3, %g2
or %g7, %g1, %g7
or %g2, %g7, %g2
brnz,a,pt %o3, 3f
sra %g2, 0, %g2
3: ba,pt %xcc, 0f
stx %g2, [%o0]
9: lduba [%o2] %asi, %g2
10: lduba [%o2 + 1] %asi, %g3
sllx %g2, 56, %g2
11: lduba [%o2 + 2] %asi, %g7
sllx %g3, 48, %g3
12: lduba [%o2 + 3] %asi, %g1
sllx %g7, 40, %g7
sllx %g1, 32, %g1
or %g2, %g3, %g2
or %g7, %g1, %g7
13: lduba [%o2 + 4] %asi, %g3
or %g2, %g7, %g7
14: lduba [%o2 + 5] %asi, %g1
sllx %g3, 24, %g3
15: lduba [%o2 + 6] %asi, %g2
sllx %g1, 16, %g1
or %g7, %g3, %g7
16: lduba [%o2 + 7] %asi, %g3
sllx %g2, 8, %g2
or %g7, %g1, %g7
or %g2, %g3, %g2
or %g7, %g2, %g7
cmp %o1, 8
be,a,pt %icc, 0f
stx %g7, [%o0]
srlx %g7, 32, %g2
sra %g7, 0, %g7
stx %g2, [%o0]
stx %g7, [%o0 + 8]
0:
wr %o5, 0x0, %asi
retl
nop
.size __do_int_load, .-__do_int_load
.section __ex_table
.word 4b, kernel_unaligned_trap_fault
.word 5b, kernel_unaligned_trap_fault
.word 6b, kernel_unaligned_trap_fault
.word 7b, kernel_unaligned_trap_fault
.word 8b, kernel_unaligned_trap_fault
.word 9b, kernel_unaligned_trap_fault
.word 10b, kernel_unaligned_trap_fault
.word 11b, kernel_unaligned_trap_fault
.word 12b, kernel_unaligned_trap_fault
.word 13b, kernel_unaligned_trap_fault
.word 14b, kernel_unaligned_trap_fault
.word 15b, kernel_unaligned_trap_fault
.word 16b, kernel_unaligned_trap_fault
.previous

255
arch/sparc64/kernel/unaligned.c
View File

@ -180,169 +180,28 @@ static void __attribute_used__ 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"); \
})
extern void do_int_load(unsigned long *dest_reg, int size,
unsigned long *saddr, int is_signed, int asi);
#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"); \
})
extern void __do_int_store(unsigned long *dst_addr, int size,
unsigned long *src_val, int asi);
#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); \
})
static inline void do_int_store(int reg_num, int size, unsigned long *dst_addr,
struct pt_regs *regs, int asi)
{
unsigned long zero = 0;
unsigned long *src_val = &zero;
extern void smp_capture(void);
extern void smp_release(void);
#define do_atomic(srcdest_reg, mem, errh) ({ \
unsigned long flags, tmp; \
\
smp_capture(); \
local_irq_save(flags); \
tmp = *srcdest_reg; \
do_integer_load(srcdest_reg, 4, mem, 0, errh); \
store_common(mem, 4, &tmp, errh); \
local_irq_restore(flags); \
smp_release(); \
})
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);
}
__do_int_store(dst_addr, size, src_val, asi);
}
static inline void advance(struct pt_regs *regs)
{
@ -364,24 +223,29 @@ 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)
void kernel_mna_trap_fault(void)
{
unsigned long g2 = regs->u_regs [UREG_G2];
struct pt_regs *regs = current_thread_info()->kern_una_regs;
unsigned int insn = current_thread_info()->kern_una_insn;
unsigned long g2 = regs->u_regs[UREG_G2];
unsigned long fixup = search_extables_range(regs->tpc, &g2);
if (!fixup) {
unsigned long address = compute_effective_address(regs, insn, ((insn >> 25) & 0x1f));
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");
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 "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",
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->{mm,active_mm}->pgd = %016lx\n",
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);
@ -400,48 +264,41 @@ asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn, u
enum direction dir = decode_direction(insn);
int size = decode_access_size(insn);
current_thread_info()->kern_una_regs = regs;
current_thread_info()->kern_una_insn = 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);
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", "g7", "cc");
kernel_mna_trap_fault();
} else {
unsigned long addr = compute_effective_address(regs, insn, ((insn >> 25) & 0x1f));
unsigned long addr;
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]);
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);
do_int_load(fetch_reg_addr(((insn>>25)&0x1f), regs),
size, (unsigned long *) addr,
decode_signedness(insn),
decode_asi(insn, regs));
break;
case store:
do_integer_store(((insn>>25)&0x1f), size,
(unsigned long *) addr, regs,
decode_asi(insn, regs),
kernel_unaligned_trap_fault);
do_int_store(((insn>>25)&0x1f), size,
(unsigned long *) addr, regs,
decode_asi(insn, regs));
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... */

5
include/asm-sparc64/thread_info.h
View File

@ -68,6 +68,9 @@ struct thread_info {
struct restart_block restart_block;
struct pt_regs *kern_una_regs;
unsigned int kern_una_insn;
unsigned long fpregs[0] __attribute__ ((aligned(64)));
};
@ -103,6 +106,8 @@ struct thread_info {
#define TI_PCR 0x00000490
#define TI_CEE_STUFF 0x00000498
#define TI_RESTART_BLOCK 0x000004a0
#define TI_KUNA_REGS 0x000004c8
#define TI_KUNA_INSN 0x000004d0
#define TI_FPREGS 0x00000500
/* We embed this in the uppermost byte of thread_info->flags */