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authorDavid S. Miller <davem@davemloft.net>2005-08-19 15:55:33 -0700
committerDavid S. Miller <davem@davemloft.net>2005-08-19 15:55:33 -0700
commita3f9985843b674cbcb58f39fab8416675e7ab842 (patch)
treeaa869cd04ff618d018c5f39b7a3b0070d5e3957d /arch
parent8d5290149ee1c6a4cea5f5146d64e2a0d48f4988 (diff)
[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>
Diffstat (limited to 'arch')
-rw-r--r--arch/sparc64/kernel/Makefile2
-rw-r--r--arch/sparc64/kernel/traps.c3
-rw-r--r--arch/sparc64/kernel/una_asm.S153
-rw-r--r--arch/sparc64/kernel/unaligned.c261
4 files changed, 216 insertions, 203 deletions
diff --git a/arch/sparc64/kernel/Makefile b/arch/sparc64/kernel/Makefile
index 093281bdf85..6f00ab8b9d2 100644
--- a/arch/sparc64/kernel/Makefile
+++ b/arch/sparc64/kernel/Makefile
@@ -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
diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
index 100b0107c4b..0c9e54b2f0c 100644
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -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();
diff --git a/arch/sparc64/kernel/una_asm.S b/arch/sparc64/kernel/una_asm.S
new file mode 100644
index 00000000000..cbb40585253
--- /dev/null
+++ b/arch/sparc64/kernel/una_asm.S
@@ -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
diff --git a/arch/sparc64/kernel/unaligned.c b/arch/sparc64/kernel/unaligned.c
index 4372bf32ecf..11c3e88732e 100644
--- a/arch/sparc64/kernel/unaligned.c
+++ b/arch/sparc64/kernel/unaligned.c
@@ -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"); \
-})
-
-#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); \
-})
-
-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(); \
-})
+extern void __do_int_store(unsigned long *dst_addr, int size,
+ unsigned long *src_val, int asi);
+
+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;
+
+ 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);
-
- __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");
+ printk("Unsupported unaligned load/store trap for kernel "
+ "at <%016lx>.\n", regs->tpc);
+ unaligned_panic("Kernel does fpu/atomic "
+ "unaligned load/store.", regs);
+
+ 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);
- break;
-#if 0 /* unsupported */
- case both:
- do_atomic(fetch_reg_addr(((insn>>25)&0x1f), regs),
- (unsigned long *) addr,
- kernel_unaligned_trap_fault);
+ do_int_store(((insn>>25)&0x1f), size,
+ (unsigned long *) addr, regs,
+ decode_asi(insn, regs));
break;
-#endif
+
default:
panic("Impossible kernel unaligned trap.");
/* Not reached... */