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ARM: memcpy: use frame pointer as unwind anchor

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The memcpy template is a bit unusual in the way it manages the stack
pointer: depending on the execution path through the function, the SP
assumes different values as different subsets of the register file are
preserved and restored again. This is problematic when it comes to EHABI
unwind info, as it is not instruction accurate, and does not allow
tracking the SP value as it changes.

Commit 279f487e0b ("ARM: 8225/1: Add unwinding support for memory
copy functions") addressed this by carving up the function in different
chunks as far as the unwinder is concerned, and keeping a set of unwind
directives for each of them, each corresponding with the state of the
stack pointer during execution of the chunk in question. This not only
duplicates unwind info unnecessarily, but it also complicates unwinding
the stack upon overflow.

Instead, let's do what the compiler does when the SP is updated halfway
through a function, which is to use a frame pointer and emit the
appropriate unwind directives to communicate this to the unwinder.

Note that Thumb-2 uses R7 for this, while ARM uses R11 aka FP. So let's
avoid touching R7 in the body of the template, so that Thumb-2 can use
it as the frame pointer. R11 was not modified in the first place.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Keith Packard <keithpac@amazon.com>
Tested-by: Marc Zyngier <maz@kernel.org>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M
This commit is contained in:
Ard Biesheuvel 2021-10-03 19:05:53 +02:00
parent 9974f85776
commit ba999a0402
4 changed files with 38 additions and 68 deletions
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13
arch/arm/lib/copy_from_user.S
View File

@ -91,18 +91,15 @@
strb\cond \reg, [\ptr], #1
.endm
.macro enter reg1 reg2
.macro enter regs:vararg
mov r3, #0
stmdb sp!, {r0, r2, r3, \reg1, \reg2}
UNWIND( .save {r0, r2, r3, \regs} )
stmdb sp!, {r0, r2, r3, \regs}
.endm
.macro usave reg1 reg2
UNWIND( .save {r0, r2, r3, \reg1, \reg2} )
.endm
.macro exit reg1 reg2
.macro exit regs:vararg
add sp, sp, #8
ldmfd sp!, {r0, \reg1, \reg2}
ldmfd sp!, {r0, \regs}
.endm
.text

67
arch/arm/lib/copy_template.S
View File

@ -69,13 +69,10 @@
* than one 32bit instruction in Thumb-2)
*/
UNWIND( .fnstart )
enter r4, lr
UNWIND( .fnend )
UNWIND( .fnstart )
usave r4, lr @ in first stmdb block
enter r4, UNWIND(fpreg,) lr
UNWIND( .setfp fpreg, sp )
UNWIND( mov fpreg, sp )
subs r2, r2, #4
blt 8f
@ -86,12 +83,7 @@
bne 10f
1: subs r2, r2, #(28)
stmfd sp!, {r5 - r8}
UNWIND( .fnend )
UNWIND( .fnstart )
usave r4, lr
UNWIND( .save {r5 - r8} ) @ in second stmfd block
stmfd sp!, {r5, r6, r8, r9}
blt 5f
CALGN( ands ip, r0, #31 )
@ -110,9 +102,9 @@
PLD( pld [r1, #92] )
3: PLD( pld [r1, #124] )
4: ldr8w r1, r3, r4, r5, r6, r7, r8, ip, lr, abort=20f
4: ldr8w r1, r3, r4, r5, r6, r8, r9, ip, lr, abort=20f
subs r2, r2, #32
str8w r0, r3, r4, r5, r6, r7, r8, ip, lr, abort=20f
str8w r0, r3, r4, r5, r6, r8, r9, ip, lr, abort=20f
bge 3b
PLD( cmn r2, #96 )
PLD( bge 4b )
@ -132,8 +124,8 @@
ldr1w r1, r4, abort=20f
ldr1w r1, r5, abort=20f
ldr1w r1, r6, abort=20f
ldr1w r1, r7, abort=20f
ldr1w r1, r8, abort=20f
ldr1w r1, r9, abort=20f
ldr1w r1, lr, abort=20f
#if LDR1W_SHIFT < STR1W_SHIFT
@ -150,17 +142,14 @@
str1w r0, r4, abort=20f
str1w r0, r5, abort=20f
str1w r0, r6, abort=20f
str1w r0, r7, abort=20f
str1w r0, r8, abort=20f
str1w r0, r9, abort=20f
str1w r0, lr, abort=20f
CALGN( bcs 2b )
7: ldmfd sp!, {r5 - r8}
UNWIND( .fnend ) @ end of second stmfd block
7: ldmfd sp!, {r5, r6, r8, r9}
UNWIND( .fnstart )
usave r4, lr @ still in first stmdb block
8: movs r2, r2, lsl #31
ldr1b r1, r3, ne, abort=21f
ldr1b r1, r4, cs, abort=21f
@ -169,7 +158,7 @@
str1b r0, r4, cs, abort=21f
str1b r0, ip, cs, abort=21f
exit r4, pc
exit r4, UNWIND(fpreg,) pc
9: rsb ip, ip, #4
cmp ip, #2
@ -189,13 +178,10 @@
ldr1w r1, lr, abort=21f
beq 17f
bgt 18f
UNWIND( .fnend )
.macro forward_copy_shift pull push
UNWIND( .fnstart )
usave r4, lr @ still in first stmdb block
subs r2, r2, #28
blt 14f
@ -205,12 +191,8 @@
CALGN( subcc r2, r2, ip )
CALGN( bcc 15f )
11: stmfd sp!, {r5 - r9}
UNWIND( .fnend )
11: stmfd sp!, {r5, r6, r8 - r10}
UNWIND( .fnstart )
usave r4, lr
UNWIND( .save {r5 - r9} ) @ in new second stmfd block
PLD( pld [r1, #0] )
PLD( subs r2, r2, #96 )
PLD( pld [r1, #28] )
@ -219,35 +201,32 @@
PLD( pld [r1, #92] )
12: PLD( pld [r1, #124] )
13: ldr4w r1, r4, r5, r6, r7, abort=19f
13: ldr4w r1, r4, r5, r6, r8, abort=19f
mov r3, lr, lspull #\pull
subs r2, r2, #32
ldr4w r1, r8, r9, ip, lr, abort=19f
ldr4w r1, r9, r10, ip, lr, abort=19f
orr r3, r3, r4, lspush #\push
mov r4, r4, lspull #\pull
orr r4, r4, r5, lspush #\push
mov r5, r5, lspull #\pull
orr r5, r5, r6, lspush #\push
mov r6, r6, lspull #\pull
orr r6, r6, r7, lspush #\push
mov r7, r7, lspull #\pull
orr r7, r7, r8, lspush #\push
orr r6, r6, r8, lspush #\push
mov r8, r8, lspull #\pull
orr r8, r8, r9, lspush #\push
mov r9, r9, lspull #\pull
orr r9, r9, ip, lspush #\push
orr r9, r9, r10, lspush #\push
mov r10, r10, lspull #\pull
orr r10, r10, ip, lspush #\push
mov ip, ip, lspull #\pull
orr ip, ip, lr, lspush #\push
str8w r0, r3, r4, r5, r6, r7, r8, r9, ip, abort=19f
str8w r0, r3, r4, r5, r6, r8, r9, r10, ip, abort=19f
bge 12b
PLD( cmn r2, #96 )
PLD( bge 13b )
ldmfd sp!, {r5 - r9}
UNWIND( .fnend ) @ end of the second stmfd block
ldmfd sp!, {r5, r6, r8 - r10}
UNWIND( .fnstart )
usave r4, lr @ still in first stmdb block
14: ands ip, r2, #28
beq 16f
@ -262,7 +241,6 @@
16: sub r1, r1, #(\push / 8)
b 8b
UNWIND( .fnend )
.endm
@ -273,6 +251,7 @@
18: forward_copy_shift pull=24 push=8
UNWIND( .fnend )
/*
* Abort preamble and completion macros.
@ -282,13 +261,13 @@
*/
.macro copy_abort_preamble
19: ldmfd sp!, {r5 - r9}
19: ldmfd sp!, {r5, r6, r8 - r10}
b 21f
20: ldmfd sp!, {r5 - r8}
20: ldmfd sp!, {r5, r6, r8, r9}
21:
.endm
.macro copy_abort_end
ldmfd sp!, {r4, pc}
ldmfd sp!, {r4, UNWIND(fpreg,) pc}
.endm

13
arch/arm/lib/copy_to_user.S
View File

@ -90,18 +90,15 @@
strusr \reg, \ptr, 1, \cond, abort=\abort
.endm
.macro enter reg1 reg2
.macro enter regs:vararg
mov r3, #0
stmdb sp!, {r0, r2, r3, \reg1, \reg2}
UNWIND( .save {r0, r2, r3, \regs} )
stmdb sp!, {r0, r2, r3, \regs}
.endm
.macro usave reg1 reg2
UNWIND( .save {r0, r2, r3, \reg1, \reg2} )
.endm
.macro exit reg1 reg2
.macro exit regs:vararg
add sp, sp, #8
ldmfd sp!, {r0, \reg1, \reg2}
ldmfd sp!, {r0, \regs}
.endm
.text

13
arch/arm/lib/memcpy.S
View File

@ -42,16 +42,13 @@
strb\cond \reg, [\ptr], #1
.endm
.macro enter reg1 reg2
stmdb sp!, {r0, \reg1, \reg2}
.macro enter regs:vararg
UNWIND( .save {r0, \regs} )
stmdb sp!, {r0, \regs}
.endm
.macro usave reg1 reg2
UNWIND( .save {r0, \reg1, \reg2} )
.endm
.macro exit reg1 reg2
ldmfd sp!, {r0, \reg1, \reg2}
.macro exit regs:vararg
ldmfd sp!, {r0, \regs}
.endm
.text