提交 e22c12f9 编写于 作者: R Russell King

ARM: entry: data abort: use r2 as base of pt_regs rather than stack

Now that we pass r2 into these helper functions as the pointer to
pt_regs, use r2 as the base of the registers on the stack rather
than using the stack pointer directly.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
上级 da740472
......@@ -73,11 +73,11 @@ ENTRY(v4t_late_abort)
add r6, r6, r6, lsr #4
and r6, r6, #15 @ r6 = no. of registers to transfer.
and r5, r8, #15 << 16 @ Extract 'n' from instruction
ldr r7, [sp, r5, lsr #14] @ Get register 'Rn'
ldr r7, [r2, r5, 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, [sp, r5, lsr #14] @ Put register 'Rn'
str r7, [r2, r5, lsr #14] @ Put register 'Rn'
b do_DataAbort
.data_arm_lateldrhpre:
......@@ -88,14 +88,14 @@ ENTRY(v4t_late_abort)
tst r8, #1 << 22 @ if (immediate offset)
andne r6, r8, #0xf00 @ { immediate high nibble
orrne r6, r5, r6, lsr #4 @ combine nibbles } else
ldreq r6, [sp, r5, lsl #2] @ { load Rm value }
ldreq r6, [r2, r5, lsl #2] @ { load Rm value }
.data_arm_apply_r6_and_rn:
and r5, r8, #15 << 16 @ Extract 'n' from instruction
ldr r7, [sp, r5, lsr #14] @ Get register 'Rn'
ldr r7, [r2, r5, 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, [sp, r5, lsr #14] @ Put register 'Rn'
str r7, [r2, r5, lsr #14] @ Put register 'Rn'
b do_DataAbort
.data_arm_lateldrpreconst:
......@@ -105,11 +105,11 @@ ENTRY(v4t_late_abort)
movs r9, r8, lsl #20 @ Get offset
beq do_DataAbort @ zero -> no fixup
and r5, r8, #15 << 16 @ Extract 'n' from instruction
ldr r7, [sp, r5, lsr #14] @ Get register 'Rn'
ldr r7, [r2, r5, lsr #14] @ Get register 'Rn'
tst r8, #1 << 23 @ Check U bit
subne r7, r7, r9, lsr #20 @ Undo increment
addeq r7, r7, r9, lsr #20 @ Undo decrement
str r7, [sp, r5, lsr #14] @ Put register 'Rn'
str r7, [r2, r5, lsr #14] @ Put register 'Rn'
b do_DataAbort
.data_arm_lateldrprereg:
......@@ -117,7 +117,7 @@ ENTRY(v4t_late_abort)
beq do_DataAbort @ no writeback -> no fixup
.data_arm_lateldrpostreg:
and r7, r8, #15 @ Extract 'm' from instruction
ldr r6, [sp, r7, lsl #2] @ Get register 'Rm'
ldr r6, [r2, r7, lsl #2] @ Get register 'Rm'
mov r5, r8, lsr #7 @ get shift count
ands r5, r5, #31
and r7, r8, #0x70 @ get shift type
......@@ -201,11 +201,11 @@ ENTRY(v4t_late_abort)
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, [sp, #13 << 2]
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, [sp, #13 << 2]
str r7, [r2, #13 << 2]
b do_DataAbort
.data_thumb_ldmstm:
......@@ -217,8 +217,8 @@ ENTRY(v4t_late_abort)
add r6, r6, r9, lsr #2
add r6, r6, r6, lsr #4
and r5, r8, #7 << 8
ldr r7, [sp, r5, lsr #6]
ldr r7, [r2, r5, lsr #6]
and r6, r6, #15 @ number of regs to transfer
sub r7, r7, r6, lsl #2 @ always decrement
str r7, [sp, r5, lsr #6]
str r7, [r2, r5, lsr #6]
b do_DataAbort
......@@ -96,20 +96,20 @@ ENTRY(cpu_arm6_data_abort)
add r6, r6, r6, lsr #4
and r6, r6, #15 @ r6 = no. of registers to transfer.
and r5, r8, #15 << 16 @ Extract 'n' from instruction
ldr r7, [sp, r5, lsr #14] @ Get register 'Rn'
ldr r7, [r2, r5, 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, [sp, r5, lsr #14] @ Put register 'Rn'
str r7, [r2, r5, lsr #14] @ Put register 'Rn'
b do_DataAbort
.data_arm_apply_r6_and_rn:
and r5, r8, #15 << 16 @ Extract 'n' from instruction
ldr r7, [sp, r5, lsr #14] @ Get register 'Rn'
ldr r7, [r2, r5, 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, [sp, r5, lsr #14] @ Put register 'Rn'
str r7, [r2, r5, lsr #14] @ Put register 'Rn'
b do_DataAbort
.data_arm_lateldrpreconst:
......@@ -119,11 +119,11 @@ ENTRY(cpu_arm6_data_abort)
movs r9, r8, lsl #20 @ Get offset
beq do_DataAbort @ zero -> no fixup
and r5, r8, #15 << 16 @ Extract 'n' from instruction
ldr r7, [sp, r5, lsr #14] @ Get register 'Rn'
ldr r7, [r2, r5, lsr #14] @ Get register 'Rn'
tst r8, #1 << 23 @ Check U bit
subne r7, r7, r9, lsr #20 @ Undo increment
addeq r7, r7, r9, lsr #20 @ Undo decrement
str r7, [sp, r5, lsr #14] @ Put register 'Rn'
str r7, [r2, r5, lsr #14] @ Put register 'Rn'
b do_DataAbort
.data_arm_lateldrprereg:
......@@ -131,7 +131,7 @@ ENTRY(cpu_arm6_data_abort)
beq do_DataAbort @ no writeback -> no fixup
.data_arm_lateldrpostreg:
and r7, r8, #15 @ Extract 'm' from instruction
ldr r6, [sp, r7, lsl #2] @ Get register 'Rm'
ldr r6, [r2, r7, lsl #2] @ Get register 'Rm'
mov r5, r8, lsr #7 @ get shift count
ands r5, r5, #31
and r7, r8, #0x70 @ get shift type
......
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