mirror of https://gitee.com/openkylin/linux.git
223 lines
6.4 KiB
ArmAsm
223 lines
6.4 KiB
ArmAsm
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
/*
|
|
* Function: v4t_late_abort
|
|
*
|
|
* Params : r2 = pt_regs
|
|
* : r4 = aborted context pc
|
|
* : r5 = aborted context psr
|
|
*
|
|
* Returns : r4-r5, r10-r11, r13 preserved
|
|
*
|
|
* Purpose : obtain information about current aborted instruction.
|
|
* Note: we read user space. This means we might cause a data
|
|
* abort here if the I-TLB and D-TLB aren't seeing the same
|
|
* picture. Unfortunately, this does happen. We live with it.
|
|
*/
|
|
ENTRY(v4t_late_abort)
|
|
tst r5, #PSR_T_BIT @ check for thumb mode
|
|
#ifdef CONFIG_CPU_CP15_MMU
|
|
mrc p15, 0, r1, c5, c0, 0 @ get FSR
|
|
mrc p15, 0, r0, c6, c0, 0 @ get FAR
|
|
bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR
|
|
#else
|
|
mov r0, #0 @ clear r0, r1 (no FSR/FAR)
|
|
mov r1, #0
|
|
#endif
|
|
bne .data_thumb_abort
|
|
ldr r8, [r4] @ read arm instruction
|
|
uaccess_disable ip @ disable userspace access
|
|
tst r8, #1 << 20 @ L = 1 -> write?
|
|
orreq r1, r1, #1 << 11 @ yes.
|
|
and r7, r8, #15 << 24
|
|
add pc, pc, r7, lsr #22 @ Now branch to the relevant processing routine
|
|
nop
|
|
|
|
/* 0 */ b .data_arm_lateldrhpost @ ldrh rd, [rn], #m/rm
|
|
/* 1 */ b .data_arm_lateldrhpre @ ldrh rd, [rn, #m/rm]
|
|
/* 2 */ b .data_unknown
|
|
/* 3 */ b .data_unknown
|
|
/* 4 */ b .data_arm_lateldrpostconst @ ldr rd, [rn], #m
|
|
/* 5 */ b .data_arm_lateldrpreconst @ ldr rd, [rn, #m]
|
|
/* 6 */ b .data_arm_lateldrpostreg @ ldr rd, [rn], rm
|
|
/* 7 */ b .data_arm_lateldrprereg @ ldr rd, [rn, rm]
|
|
/* 8 */ b .data_arm_ldmstm @ ldm*a rn, <rlist>
|
|
/* 9 */ b .data_arm_ldmstm @ ldm*b rn, <rlist>
|
|
/* a */ b .data_unknown
|
|
/* b */ b .data_unknown
|
|
/* c */ b do_DataAbort @ ldc rd, [rn], #m @ Same as ldr rd, [rn], #m
|
|
/* d */ b do_DataAbort @ ldc rd, [rn, #m]
|
|
/* e */ b .data_unknown
|
|
/* f */
|
|
.data_unknown: @ Part of jumptable
|
|
mov r0, r4
|
|
mov r1, r8
|
|
b baddataabort
|
|
|
|
.data_arm_ldmstm:
|
|
tst r8, #1 << 21 @ check writeback bit
|
|
beq do_DataAbort @ no writeback -> no fixup
|
|
mov r7, #0x11
|
|
orr r7, r7, #0x1100
|
|
and r6, r8, r7
|
|
and r9, r8, r7, lsl #1
|
|
add r6, r6, r9, lsr #1
|
|
and r9, r8, r7, lsl #2
|
|
add r6, r6, r9, lsr #2
|
|
and r9, r8, r7, lsl #3
|
|
add r6, r6, r9, lsr #3
|
|
add r6, r6, r6, lsr #8
|
|
add r6, r6, r6, lsr #4
|
|
and r6, r6, #15 @ r6 = no. of registers to transfer.
|
|
and r9, r8, #15 << 16 @ Extract 'n' from instruction
|
|
ldr r7, [r2, r9, lsr #14] @ Get register 'Rn'
|
|
tst r8, #1 << 23 @ Check U bit
|
|
subne r7, r7, r6, lsl #2 @ Undo increment
|
|
addeq r7, r7, r6, lsl #2 @ Undo decrement
|
|
str r7, [r2, r9, lsr #14] @ Put register 'Rn'
|
|
b do_DataAbort
|
|
|
|
.data_arm_lateldrhpre:
|
|
tst r8, #1 << 21 @ Check writeback bit
|
|
beq do_DataAbort @ No writeback -> no fixup
|
|
.data_arm_lateldrhpost:
|
|
and r9, r8, #0x00f @ get Rm / low nibble of immediate value
|
|
tst r8, #1 << 22 @ if (immediate offset)
|
|
andne r6, r8, #0xf00 @ { immediate high nibble
|
|
orrne r6, r9, r6, lsr #4 @ combine nibbles } else
|
|
ldreq r6, [r2, r9, lsl #2] @ { load Rm value }
|
|
.data_arm_apply_r6_and_rn:
|
|
and r9, r8, #15 << 16 @ Extract 'n' from instruction
|
|
ldr r7, [r2, r9, lsr #14] @ Get register 'Rn'
|
|
tst r8, #1 << 23 @ Check U bit
|
|
subne r7, r7, r6 @ Undo incrmenet
|
|
addeq r7, r7, r6 @ Undo decrement
|
|
str r7, [r2, r9, lsr #14] @ Put register 'Rn'
|
|
b do_DataAbort
|
|
|
|
.data_arm_lateldrpreconst:
|
|
tst r8, #1 << 21 @ check writeback bit
|
|
beq do_DataAbort @ no writeback -> no fixup
|
|
.data_arm_lateldrpostconst:
|
|
movs r6, r8, lsl #20 @ Get offset
|
|
beq do_DataAbort @ zero -> no fixup
|
|
and r9, r8, #15 << 16 @ Extract 'n' from instruction
|
|
ldr r7, [r2, r9, lsr #14] @ Get register 'Rn'
|
|
tst r8, #1 << 23 @ Check U bit
|
|
subne r7, r7, r6, lsr #20 @ Undo increment
|
|
addeq r7, r7, r6, lsr #20 @ Undo decrement
|
|
str r7, [r2, r9, lsr #14] @ Put register 'Rn'
|
|
b do_DataAbort
|
|
|
|
.data_arm_lateldrprereg:
|
|
tst r8, #1 << 21 @ check writeback bit
|
|
beq do_DataAbort @ no writeback -> no fixup
|
|
.data_arm_lateldrpostreg:
|
|
and r7, r8, #15 @ Extract 'm' from instruction
|
|
ldr r6, [r2, r7, lsl #2] @ Get register 'Rm'
|
|
mov r9, r8, lsr #7 @ get shift count
|
|
ands r9, r9, #31
|
|
and r7, r8, #0x70 @ get shift type
|
|
orreq r7, r7, #8 @ shift count = 0
|
|
add pc, pc, r7
|
|
nop
|
|
|
|
mov r6, r6, lsl r9 @ 0: LSL #!0
|
|
b .data_arm_apply_r6_and_rn
|
|
b .data_arm_apply_r6_and_rn @ 1: LSL #0
|
|
nop
|
|
b .data_unknown @ 2: MUL?
|
|
nop
|
|
b .data_unknown @ 3: MUL?
|
|
nop
|
|
mov r6, r6, lsr r9 @ 4: LSR #!0
|
|
b .data_arm_apply_r6_and_rn
|
|
mov r6, r6, lsr #32 @ 5: LSR #32
|
|
b .data_arm_apply_r6_and_rn
|
|
b .data_unknown @ 6: MUL?
|
|
nop
|
|
b .data_unknown @ 7: MUL?
|
|
nop
|
|
mov r6, r6, asr r9 @ 8: ASR #!0
|
|
b .data_arm_apply_r6_and_rn
|
|
mov r6, r6, asr #32 @ 9: ASR #32
|
|
b .data_arm_apply_r6_and_rn
|
|
b .data_unknown @ A: MUL?
|
|
nop
|
|
b .data_unknown @ B: MUL?
|
|
nop
|
|
mov r6, r6, ror r9 @ C: ROR #!0
|
|
b .data_arm_apply_r6_and_rn
|
|
mov r6, r6, rrx @ D: RRX
|
|
b .data_arm_apply_r6_and_rn
|
|
b .data_unknown @ E: MUL?
|
|
nop
|
|
b .data_unknown @ F: MUL?
|
|
|
|
.data_thumb_abort:
|
|
ldrh r8, [r4] @ read instruction
|
|
uaccess_disable ip @ disable userspace access
|
|
tst r8, #1 << 11 @ L = 1 -> write?
|
|
orreq r1, r1, #1 << 8 @ yes
|
|
and r7, r8, #15 << 12
|
|
add pc, pc, r7, lsr #10 @ lookup in table
|
|
nop
|
|
|
|
/* 0 */ b .data_unknown
|
|
/* 1 */ b .data_unknown
|
|
/* 2 */ b .data_unknown
|
|
/* 3 */ b .data_unknown
|
|
/* 4 */ b .data_unknown
|
|
/* 5 */ b .data_thumb_reg
|
|
/* 6 */ b do_DataAbort
|
|
/* 7 */ b do_DataAbort
|
|
/* 8 */ b do_DataAbort
|
|
/* 9 */ b do_DataAbort
|
|
/* A */ b .data_unknown
|
|
/* B */ b .data_thumb_pushpop
|
|
/* C */ b .data_thumb_ldmstm
|
|
/* D */ b .data_unknown
|
|
/* E */ b .data_unknown
|
|
/* F */ b .data_unknown
|
|
|
|
.data_thumb_reg:
|
|
tst r8, #1 << 9
|
|
beq do_DataAbort
|
|
tst r8, #1 << 10 @ If 'S' (signed) bit is set
|
|
movne r1, #0 @ it must be a load instr
|
|
b do_DataAbort
|
|
|
|
.data_thumb_pushpop:
|
|
tst r8, #1 << 10
|
|
beq .data_unknown
|
|
and r6, r8, #0x55 @ hweight8(r8) + R bit
|
|
and r9, r8, #0xaa
|
|
add r6, r6, r9, lsr #1
|
|
and r9, r6, #0xcc
|
|
and r6, r6, #0x33
|
|
add r6, r6, r9, lsr #2
|
|
movs r7, r8, lsr #9 @ C = r8 bit 8 (R bit)
|
|
adc r6, r6, r6, lsr #4 @ high + low nibble + R bit
|
|
and r6, r6, #15 @ number of regs to transfer
|
|
ldr r7, [r2, #13 << 2]
|
|
tst r8, #1 << 11
|
|
addeq r7, r7, r6, lsl #2 @ increment SP if PUSH
|
|
subne r7, r7, r6, lsl #2 @ decrement SP if POP
|
|
str r7, [r2, #13 << 2]
|
|
b do_DataAbort
|
|
|
|
.data_thumb_ldmstm:
|
|
and r6, r8, #0x55 @ hweight8(r8)
|
|
and r9, r8, #0xaa
|
|
add r6, r6, r9, lsr #1
|
|
and r9, r6, #0xcc
|
|
and r6, r6, #0x33
|
|
add r6, r6, r9, lsr #2
|
|
add r6, r6, r6, lsr #4
|
|
and r9, r8, #7 << 8
|
|
ldr r7, [r2, r9, lsr #6]
|
|
and r6, r6, #15 @ number of regs to transfer
|
|
sub r7, r7, r6, lsl #2 @ always decrement
|
|
str r7, [r2, r9, lsr #6]
|
|
b do_DataAbort
|