>>>>> "Phil" == Phil White <cerise@littlegreenmen.armory.com> writes: Phil> Since we're off list, I'll continue. [back into knml, it is not offtopic, AFAICT] Phil> I had an interesting first hand experience with this a number of years Phil> ago. I'll grant it was C++, but the challenge was to create a fast Phil> fibonacci generator. My initial attempt used the well known function Phil> to generate an i-th digit once it was past a certain point (I believe Phil> it was i=30 where it was faster do deal with the arithmetic). Phil> A friend of mine generated almost identical code (we think very much Phil> alike) and yet his was significantly faster. No particularly good Phil> reason algorithmically. Phil> The difference was entirely in the parse. Our arithmetic was the Phil> same, but he reversed the two sums and it ended up being faster. Can we look at this fibonacci example ? I'd be really suprised if a compiler, which does even remotely decent instructions scheduling to depend on the order of expression in the source code (given that the correctness of the program does not depend on the order, i.e. the expressions are not related buy data flow). Phil> If you aren't using larger bits of code, you miss those interactions. Phil> Small bits of code are good for showing a compiler's ability to do Phil> a certain optimization. They fail miserably at any real world test Phil> of whether or not it appears in more complex code. Handwaving. Your anectodal example is not an evidence. Your conclusions that compilers "fail miserably on at any real world test" are totaly bogus. The obvious evidence being that some compilers produce significantly better code that other compilers and (usually) newer compiler versions produce better code than the older compiler versions. Phil> In this particular case, we're talking about kernel code which is Phil> referenced in a few places. There is a very high probability that Phil> some optimizations which would be caught in theory are skimmed over Phil> in a more complex AST. I see no point in instroducing probabilities in a discussion about a deterministic process like compilation. Phil> If you don't believe me, there's code which is freely available Phil> over the net to prove it. It's the direct-io.c in the kernel which Phil> was referenced in the discussion. Believe in what? I'm not religious, so I don't believe in anything. I can be CONVINCED though. First my knowledge of compilers tells me what a compiler can or can't do (admittedly I do not develop compilers) and second my expectations are confirmed by a number of "real world" examples. So, if you don't like my example programs, we'll use direct-io.c. I've attached two patches (against 2.6.1). In direct-io.c.else.diff, instead of goto we use an "else if" and in direct-io.c.ret.diff we place a return statement. Also attached are the outputs from the original direct-io.c, with the "else" patch applied and with the "ret" patch applied (I've left only dio_refill_pages function). There isn't ANY difference between direct-io.s.orig and direct-io.s.else. There's no essential difference between direct-io.s.orig and direct-io.s.ret, both compilations have the same control flow graph, with the same instructions in the basic blocks. There's one instruction more in direct-io.s.ret (the "xorl %eax, %eax" before "jmp .L1"), but in that path direct-io.s.ret executes one instruction less than direct-io.s.orig. This again confirms my initial opinion that the compiler would generate essentially the same code with or without the goto. As an extra bonus, I've attached the outputs for the ARM architecture. Again, the original and the "else" variants are identical. The original and the "ret" variant contain the same number of instructions, but the original variant does execute two instructions more, one being a jump. Phil> On Mon, Jan 12, 2004 at 10:06:33AM +0200, Momchil Velikov wrote: >> >>>>> "Phil" == Phil White <cerise@littlegreenmen.armory.com> writes: >> Phil> No problems with your criteria, but rather your example. Small code Phil> does not lend itself reasonably to a demonstration of the compiler's Phil> expected output. >> >> Oh, yes it does. The compiler is hardly concerned with the absolute >> size (number of statements and variables) of the functions, but rather >> with specific disposition of data- and control- flow information -- >> pretty well captured by small examples. Please, avoid bottom-posting. Thanks. ~velco
--- direct-io.c.orig 2004-01-13 10:48:25.000000000 +0200
+++ direct-io.c.else 2004-01-13 10:51:13.000000000 +0200
@@ -163,17 +163,14 @@ static int dio_refill_pages(struct dio *
dio->head = 0;
dio->tail = 1;
ret = 0;
- goto out;
- }
-
- if (ret >= 0) {
+ } else if (ret >= 0) {
dio->curr_user_address += ret * PAGE_SIZE;
dio->curr_page += ret;
dio->head = 0;
dio->tail = ret;
ret = 0;
}
-out:
+
return ret;
}
--- direct-io.c.orig 2004-01-13 10:48:25.000000000 +0200
+++ direct-io.c.ret 2004-01-13 11:02:44.000000000 +0200
@@ -162,10 +162,9 @@ static int dio_refill_pages(struct dio *
dio->pages[0] = ZERO_PAGE(dio->curr_user_address);
dio->head = 0;
dio->tail = 1;
- ret = 0;
- goto out;
+ return 0;
}
-
+
if (ret >= 0) {
dio->curr_user_address += ret * PAGE_SIZE;
dio->curr_page += ret;
@@ -173,7 +172,7 @@ static int dio_refill_pages(struct dio *
dio->tail = ret;
ret = 0;
}
-out:
+
return ret;
}
.file "direct-io.c" .text .p2align 4,,15 .type dio_refill_pages, @function dio_refill_pages: pushl %edi movl $64, %ecx pushl %esi pushl %ebx subl $32, %esp movl $-8192, %ebx movl 48(%esp), %edi movl 132(%edi), %edx movl 136(%edi), %eax subl %edx, %eax cmpl $65, %eax cmovl %eax, %ecx #APP andl %esp,%ebx; #NO_APP movl (%ebx), %eax movl 104(%eax), %esi leal 32(%esi), %edx movl %edx, %eax #APP # beginning down_read lock ; incl (%eax) js 2f 1: .subsection 1 .ifndef .text.lock.direct_io .text.lock.direct_io: .endif 2: pushl %ecx pushl %edx call rwsem_down_read_failed popl %edx popl %ecx jmp 1b .previous # ending down_read #NO_APP xorl %eax, %eax movl (%ebx), %edx movl %eax, 28(%esp) leal 144(%edi), %eax movl %eax, 24(%esp) xorl %eax, %eax movl %eax, 20(%esp) xorl %eax, %eax cmpl $0, 8(%edi) movl %ecx, 12(%esp) sete %al movl %eax, 16(%esp) movl 140(%edi), %eax movl %eax, 8(%esp) movl 104(%edx), %eax movl %edx, (%esp) movl %eax, 4(%esp) call get_user_pages movl %eax, %esi movl $-1, %edx movl (%ebx), %eax movl 104(%eax), %ecx leal 32(%ecx), %eax #APP # beginning __up_read lock ; xadd %edx,(%eax) js 2f 1: .subsection 1 .ifndef .text.lock.direct_io .text.lock.direct_io: .endif 2: decw %dx jnz 1b pushl %ecx call rwsem_wake popl %ecx jmp 1b .previous # ending __up_read #NO_APP testl %esi, %esi js .L22 .L20: addl %esi, 132(%edi) movl %esi, %eax sall $12, %eax addl %eax, 140(%edi) xorl %eax, %eax movl %eax, 400(%edi) movl %esi, 404(%edi) .L21: xorl %esi, %esi .L18: addl $32, %esp movl %esi, %eax popl %ebx popl %esi popl %edi ret .p2align 4,,7 .L22: movl 32(%edi), %eax testl %eax, %eax je .L16 cmpl $1, 8(%edi) je .L23 .L16: testl %esi, %esi jns .L20 jmp .L18 .L23: movl 408(%edi), %ebx testl %ebx, %ebx jne .L17 movl %esi, 408(%edi) .L17: movl mem_map, %edx movl $empty_zero_page+1073741824, %eax xorl %ecx, %ecx movl %ecx, 400(%edi) shrl $12, %eax leal (%eax,%eax,4), %eax leal (%edx,%eax,8), %eax movl $1, %edx movl %eax, 144(%edi) movl %edx, 404(%edi) jmp .L21
.file "direct-io.c" .text .p2align 4,,15 .type dio_refill_pages, @function dio_refill_pages: pushl %edi movl $64, %ecx pushl %esi pushl %ebx subl $32, %esp movl $-8192, %ebx movl 48(%esp), %edi movl 132(%edi), %edx movl 136(%edi), %eax subl %edx, %eax cmpl $65, %eax cmovl %eax, %ecx #APP andl %esp,%ebx; #NO_APP movl (%ebx), %eax movl 104(%eax), %esi leal 32(%esi), %edx movl %edx, %eax #APP # beginning down_read lock ; incl (%eax) js 2f 1: .subsection 1 .ifndef .text.lock.direct_io .text.lock.direct_io: .endif 2: pushl %ecx pushl %edx call rwsem_down_read_failed popl %edx popl %ecx jmp 1b .previous # ending down_read #NO_APP xorl %eax, %eax movl (%ebx), %edx movl %eax, 28(%esp) leal 144(%edi), %eax movl %eax, 24(%esp) xorl %eax, %eax movl %eax, 20(%esp) xorl %eax, %eax cmpl $0, 8(%edi) movl %ecx, 12(%esp) sete %al movl %eax, 16(%esp) movl 140(%edi), %eax movl %eax, 8(%esp) movl 104(%edx), %eax movl %edx, (%esp) movl %eax, 4(%esp) call get_user_pages movl %eax, %esi movl $-1, %edx movl (%ebx), %eax movl 104(%eax), %ecx leal 32(%ecx), %eax #APP # beginning __up_read lock ; xadd %edx,(%eax) js 2f 1: .subsection 1 .ifndef .text.lock.direct_io .text.lock.direct_io: .endif 2: decw %dx jnz 1b pushl %ecx call rwsem_wake popl %ecx jmp 1b .previous # ending __up_read #NO_APP testl %esi, %esi js .L20 .L19: addl %esi, 132(%edi) movl %esi, %eax sall $12, %eax addl %eax, 140(%edi) xorl %eax, %eax movl %esi, 404(%edi) xorl %esi, %esi movl %eax, 400(%edi) .L18: movl %esi, %eax .L1: addl $32, %esp popl %ebx popl %esi popl %edi ret .p2align 4,,7 .L20: movl 32(%edi), %eax testl %eax, %eax je .L16 cmpl $1, 8(%edi) je .L21 .L16: testl %esi, %esi jns .L19 jmp .L18 .L21: movl 408(%edi), %ebx testl %ebx, %ebx jne .L17 movl %esi, 408(%edi) .L17: movl mem_map, %edx movl $empty_zero_page+1073741824, %eax xorl %ecx, %ecx movl %ecx, 400(%edi) shrl $12, %eax leal (%eax,%eax,4), %eax leal (%edx,%eax,8), %eax movl $1, %edx movl %eax, 144(%edi) xorl %eax, %eax movl %edx, 404(%edi) jmp .L1
.file "direct-io.c"
.text
.align 2
.type dio_refill_pages, %function
dio_refill_pages:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, r5, r6, r7, fp, ip, lr, pc}
sub fp, ip, #4
sub sp, sp, #16
bic r5, sp, #8128
bic r5, r5, #63
ldr r3, [r5, #12]
mov r6, r0
ldr r0, [r3, #104]
add r3, r6, #136
ldmda r3, {r3, r4}
sub r4, r4, r3
add r0, r0, #32
bl __down_read
ldr r0, [r5, #12]
ldr ip, [r6, #8]
cmp r4, #64
movge r4, #64
ldr r1, [r0, #104]
ldr r2, [r6, #140]
cmp ip, #0
movne ip, #0
moveq ip, #1
mov r7, #0
mov r3, r4
add lr, r6, #144
str ip, [sp, #0]
stmib sp, {r7, lr} @ phole stm
str r7, [sp, #12]
bl get_user_pages
ldr r3, [r5, #12]
mov r4, r0
ldr r0, [r3, #104]
add r0, r0, #32
bl __up_read
cmp r4, r7
mov r1, r7
bge .L17
ldr r3, [r6, #32]
cmp r3, r7
beq .L13
ldr r2, [r6, #8]
cmp r2, #1
bne .L13
ldr r3, [r6, #408]
cmp r3, r7
ldr r3, .L18
streq r4, [r6, #408]
ldr r3, [r3, #0]
mov r4, r7
str r2, [r6, #404]
str r3, [r6, #144]
str r7, [r6, #400]
b .L15
.L13:
cmp r4, #0
blt .L15
.L17:
ldr r3, [r6, #140]
ldr r2, [r6, #132]
add r3, r3, r4, asl #12
add r2, r2, r4
str r4, [r6, #404]
str r1, [r6, #400]
mov r4, r1
str r3, [r6, #140]
str r2, [r6, #132]
.L15:
mov r0, r4
ldmea fp, {r4, r5, r6, r7, fp, sp, pc}
.L19:
.align 2
.L18:
.word empty_zero_page
.size dio_refill_pages, .-dio_refill_pages
.align 2
.type dio_get_page, %function
dio_get_page:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, fp, ip, lr, pc}
sub fp, ip, #4
add r2, r0, #404
ldmda r2, {r2, r3}
sub r3, r3, r2
mov r4, r0
cmp r3, #0
bne .L21
bl dio_refill_pages
subs r2, r0, #0
bne .L20
add r2, r4, #404
ldmda r2, {r2, r3}
sub r3, r3, r2
cmp r3, #0
streq r0, [r0, #0]
.L21:
ldr r3, [r4, #400]
add r2, r4, r3, asl #2
ldr r2, [r2, #144]
add r3, r3, #1
str r3, [r4, #400]
.L20:
mov r0, r2
ldmea fp, {r4, fp, sp, pc}
.size dio_get_page, .-dio_get_page
.align 2
.type dio_complete, %function
dio_complete:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, fp, ip, lr, pc}
sub fp, ip, #4
sub sp, sp, #4
ldr r4, [r0, #56]
cmp r4, #0
ldrne ip, [r0, #104]
ldrne r0, [r0, #4]
strne ip, [sp, #0]
movne lr, pc
movne pc, r4
.L28:
ldmea fp, {r4, fp, sp, pc}
.size dio_complete, .-dio_complete
.align 2
.type finished_one_bio, %function
finished_one_bio:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, fp, ip, lr, pc}
sub fp, ip, #4
mov r4, r0
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r0, #412]
sub r3, r3, #1
str r3, [r0, #412]
msr cpsr_c, r2 @ local_irq_restore
cmp r3, #0
bne .L30
ldr r3, [r0, #432]
cmp r3, #0
beq .L30
ldr ip, [r0, #12]
ldr r1, [r0, #28]
ldr r3, [r0, #436]
mov r1, r1, asl ip
mov r2, #0
bl dio_complete
ldr r0, [r4, #428]
ldr r1, [r4, #436]
mov r2, #0
bl aio_complete
mov r0, r4
ldmea fp, {r4, fp, sp, lr}
b kfree
.L30:
ldmea fp, {r4, fp, sp, pc}
.size finished_one_bio, .-finished_one_bio
.align 2
.type dio_bio_end_aio, %function
dio_bio_end_aio:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, fp, ip, lr, pc}
sub fp, ip, #4
ldr r4, [r0, #28]
mov r1, r0
cmp r4, #0
mov r3, #1
ldr r0, [r0, #48]
bne .L34
bl dio_bio_complete
mov r3, r4
.L34:
mov r0, r3
ldmea fp, {r4, fp, sp, pc}
.size dio_bio_end_aio, .-dio_bio_end_aio
.align 2
.type dio_bio_end_io, %function
dio_bio_end_io:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, fp, ip, lr, pc}
sub fp, ip, #4
ldr r3, [r0, #28]
mov r2, #1
cmp r3, #0
ldr r1, [r0, #48]
bne .L36
mrs r4, cpsr @ local_irq_save
orr r3, r4, #128
msr cpsr_c, r3
ldr r3, [r1, #420]
str r3, [r0, #48]
str r0, [r1, #420]
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r1, #416]
sub r3, r3, #1
str r3, [r1, #416]
msr cpsr_c, r2 @ local_irq_restore
ldr r0, [r1, #424]
cmp r0, #0
beq .L44
ldr r3, [r1, #416]
cmp r3, #0
bleq wake_up_process
.L44:
msr cpsr_c, r4 @ local_irq_restore
mov r2, #0
.L36:
mov r0, r2
ldmea fp, {r4, fp, sp, pc}
.size dio_bio_end_io, .-dio_bio_end_io
.align 2
.type dio_bio_alloc, %function
dio_bio_alloc:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, r5, r6, fp, ip, lr, pc}
sub fp, ip, #4
mov r6, r0
mov r5, r1
mov r0, #208
mov r1, r3
mov r4, r2
bl bio_alloc
cmp r0, #0
mvn r3, #11
beq .L46
str r5, [r0, #8]
str r4, [r0, #0]
ldr r3, [r6, #432]
cmp r3, #0
ldrne r3, .L51
ldreq r3, .L51+4
str r3, [r0, #40]
str r0, [r6, #0]
mov r3, #0
.L46:
mov r0, r3
ldmea fp, {r4, r5, r6, fp, sp, pc}
.L52:
.align 2
.L51:
.word dio_bio_end_aio
.word dio_bio_end_io
.size dio_bio_alloc, .-dio_bio_alloc
.align 2
.type dio_bio_submit, %function
dio_bio_submit:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, r5, fp, ip, lr, pc}
sub fp, ip, #4
ldr r5, [r0, #0]
mov r4, r0
str r0, [r5, #48]
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r0, #412]
add r3, r3, #1
str r3, [r0, #412]
msr cpsr_c, r2 @ local_irq_restore
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r0, #416]
add r3, r3, #1
str r3, [r0, #416]
msr cpsr_c, r2 @ local_irq_restore
ldr r3, [r0, #432]
cmp r3, #0
beq .L56
ldr r3, [r0, #8]
mov r0, r5
cmp r3, #0
bleq bio_set_pages_dirty
.L56:
ldr r0, [r4, #8]
mov r1, r5
bl submit_bio
mov r3, #0
str r3, [r4, #44]
str r3, [r4, #0]
ldmea fp, {r4, r5, fp, sp, pc}
.size dio_bio_submit, .-dio_bio_submit
.align 2
.type dio_cleanup, %function
dio_cleanup:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, fp, ip, lr, pc}
sub fp, ip, #4
add r2, r0, #404
ldmda r2, {r2, r3}
sub r3, r3, r2
mov r4, r0
cmp r3, #0
beq .L70
.L68:
mov r0, r4
bl dio_get_page
ldr r3, [r0, #0]
mov r1, r0
tst r3, #2048
bne .L58
ldr r3, [r0, #4]
cmp r3, #0
streq r3, [r3, #0]
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r1, #4]
sub r3, r3, #1
str r3, [r1, #4]
msr cpsr_c, r2 @ local_irq_restore
cmp r3, #0
bleq __page_cache_release
.L58:
add r2, r4, #404
ldmda r2, {r2, r3}
sub r3, r3, r2
cmp r3, #0
bne .L68
.L70:
ldmea fp, {r4, fp, sp, pc}
.size dio_cleanup, .-dio_cleanup
.align 2
.type dio_await_one, %function
dio_await_one:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, r5, r6, fp, ip, lr, pc}
sub fp, ip, #4
mov r4, r0
mrs r1, cpsr @ local_irq_save
orr r3, r1, #128
msr cpsr_c, r3
ldr r3, [r0, #420]
cmp r3, #0
bne .L98
.L93:
bic r5, sp, #8128
bic r5, r5, #63
ldr r2, [r5, #12]
mov r3, #2
str r3, [r2, #0]
ldr r6, [r4, #420]
cmp r6, #0
bne .L81
ldr r3, [r5, #12]
str r3, [r4, #424]
msr cpsr_c, r1 @ local_irq_restore
bl blk_run_queues
bl io_schedule
mrs r1, cpsr @ local_irq_save
orr r3, r1, #128
msr cpsr_c, r3
str r6, [r4, #424]
.L81:
ldr r3, [r5, #12]
mov r2, #0
str r2, [r3, #0]
ldr r3, [r4, #420]
cmp r3, r2
beq .L93
.L98:
ldr r0, [r4, #420]
ldr r3, [r0, #48]
str r3, [r4, #420]
msr cpsr_c, r1 @ local_irq_restore
ldmea fp, {r4, r5, r6, fp, sp, pc}
.size dio_await_one, .-dio_await_one
.align 2
.type dio_bio_complete, %function
dio_bio_complete:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, r5, r6, r7, r8, sl, fp, ip, lr, pc}
sub fp, ip, #4
ldr r3, [r1, #12]
mov r7, r0
ands sl, r3, #1
mvneq r3, #4
ldr r2, [r1, #36]
streq r3, [r0, #436]
ldr r3, [r7, #432]
mov r5, r1
cmp r3, #0
beq .L102
ldr r3, [r7, #8]
cmp r3, #0
bne .L102
mov r0, r5
bl bio_check_pages_dirty
b .L103
.L102:
ldrh r3, [r5, #20]
mov r8, #0
cmp r8, r3
bge .L119
mov r6, r2
.L115:
ldr r3, [r7, #8]
ldr r4, [r6, #0]
cmp r3, #0
mov r0, r4
add r6, r6, #12
bleq set_page_dirty_lock
.L108:
ldr r3, [r4, #0]
tst r3, #2048
bne .L106
ldr r3, [r4, #4]
cmp r3, #0
streq r3, [r3, #0]
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r4, #4]
sub r3, r3, #1
str r3, [r4, #4]
msr cpsr_c, r2 @ local_irq_restore
cmp r3, #0
mov r0, r4
bleq __page_cache_release
.L106:
ldrh r3, [r5, #20]
add r8, r8, #1
cmp r8, r3
blt .L115
.L119:
mov r0, r5
bl bio_put
.L103:
mov r0, r7
bl finished_one_bio
cmp sl, #0
movne r0, #0
mvneq r0, #4
ldmea fp, {r4, r5, r6, r7, r8, sl, fp, sp, pc}
.size dio_bio_complete, .-dio_bio_complete
.align 2
.type dio_await_completion, %function
dio_await_completion:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, r5, fp, ip, lr, pc}
sub fp, ip, #4
ldr r3, [r0, #0]
mov r5, #0
cmp r3, r5
mov r4, r0
blne dio_bio_submit
.L121:
ldr r3, [r4, #412]
cmp r3, #0
beq .L128
.L126:
mov r0, r4
bl dio_await_one
mov r1, r0
mov r0, r4
bl dio_bio_complete
ldr r3, [r4, #412]
cmp r5, #0
moveq r5, r0
cmp r3, #0
bne .L126
.L128:
mov r0, r5
ldmea fp, {r4, r5, fp, sp, pc}
.size dio_await_completion, .-dio_await_completion
.align 2
.type dio_bio_reap, %function
dio_bio_reap:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, fp, ip, lr, pc}
sub fp, ip, #4
ldr r3, [r0, #48]
mov r4, r0
cmp r3, #63
add r3, r3, #1
mov r0, #0
str r3, [r4, #48]
ble .L130
ldr r3, [r4, #420]
cmp r3, r0
beq .L142
.L140:
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r1, [r4, #420]
ldr r3, [r1, #48]
str r3, [r4, #420]
msr cpsr_c, r2 @ local_irq_restore
mov r0, r4
bl dio_bio_complete
ldr r3, [r4, #420]
cmp r3, #0
bne .L140
.L142:
mov r3, #0
str r3, [r4, #48]
.L130:
ldmea fp, {r4, fp, sp, pc}
.size dio_bio_reap, .-dio_bio_reap
.align 2
.type get_more_blocks, %function
get_more_blocks:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, fp, ip, lr, pc}
sub fp, ip, #4
sub sp, sp, #4
mov r4, r0
ldr r0, [r0, #408]
add r2, r4, #68
cmp r0, #0
mov r3, r2
bne .L144
str r0, [r2, #20]
ldr r1, [r4, #28]
ldr r2, [r4, #36]
str r0, [r4, #68]
cmp r1, r2
strcs r0, [r0, #0]
ldr ip, [r4, #16]
ldr r1, [r4, #28]
ldr r0, [r4, #36]
mov r2, #1
rsb r0, r1, r0
mov r2, r2, asl ip
mov lr, r0, lsr ip
sub r2, r2, #1
mov r1, r1, lsr ip
ldr ip, [r4, #8]
tst r0, r2
addne lr, lr, #1
cmp ip, #1
movne ip, #0
moveq ip, #1
ldr r0, [r4, #4]
mov r2, lr
str ip, [sp, #0]
mov lr, pc
ldr pc, [r4, #52]
.L144:
ldmea fp, {r4, fp, sp, pc}
.size get_more_blocks, .-get_more_blocks
.align 2
.type dio_new_bio, %function
dio_new_bio:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, r5, r6, r7, r8, fp, ip, lr, pc}
sub fp, ip, #4
mov r8, r1
mov r7, r0
bl dio_bio_reap
cmp r0, #0
mov r6, r0
bne .L150
ldr r0, [r7, #96]
ldr r4, [r7, #12]
ldr r5, [r7, #24]
bl bio_get_nr_vecs
mov r1, r0
cmp r1, r5
movge r1, r5
subs r3, r1, #0
sub r4, r4, #9
strle r6, [r6, #0]
mov r4, r8, asl r4
mov r2, r4
mov r0, r7
ldr r1, [r7, #96]
bl dio_bio_alloc
mov r3, #0
mov r6, r0
str r3, [r7, #44]
.L150:
mov r0, r6
ldmea fp, {r4, r5, r6, r7, r8, fp, sp, pc}
.size dio_new_bio, .-dio_new_bio
.align 2
.type dio_bio_add_page, %function
dio_bio_add_page:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, fp, ip, lr, pc}
sub fp, ip, #4
mov r4, r0
ldr r3, [r4, #120]
ldr r0, [r0, #0]
ldr r1, [r4, #116]
ldr r2, [r4, #124]
bl bio_add_page
ldr r3, [r4, #124]
cmp r0, r3
bne .L154
ldr r3, [r4, #24]
ldr r1, [r4, #116]
sub r3, r3, #1
str r3, [r4, #24]
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r1, #4]
add r3, r3, #1
str r3, [r1, #4]
msr cpsr_c, r2 @ local_irq_restore
ldr r1, [r4, #124]
ldr r2, [r4, #12]
ldr r3, [r4, #128]
mov r0, #0
add r3, r3, r1, lsr r2
str r3, [r4, #60]
ldmea fp, {r4, fp, sp, pc}
.L154:
mov r0, #1
ldmea fp, {r4, fp, sp, pc}
.size dio_bio_add_page, .-dio_bio_add_page
.align 2
.type dio_send_cur_page, %function
dio_send_cur_page:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, r5, fp, ip, lr, pc}
sub fp, ip, #4
ldr r3, [r0, #0]
mov r5, #0
cmp r3, r5
mov r4, r0
beq .L169
ldr r2, [r0, #60]
ldr r3, [r0, #128]
cmp r2, r3
blne dio_bio_submit
.L160:
ldr r3, [r4, #44]
cmp r3, #0
movne r0, r4
blne dio_bio_submit
.L159:
ldr r3, [r4, #0]
cmp r3, #0
bne .L162
.L169:
ldr r1, [r4, #128]
mov r0, r4
bl dio_new_bio
cmp r0, #0
mov r5, r0
bne .L164
.L162:
mov r0, r4
bl dio_bio_add_page
cmp r0, #0
beq .L164
mov r0, r4
bl dio_bio_submit
ldr r1, [r4, #128]
mov r0, r4
bl dio_new_bio
cmp r0, #0
mov r5, r0
bne .L164
mov r0, r4
bl dio_bio_add_page
cmp r0, #0
movne r3, #0
mov r5, r0
strne r3, [r3, #0]
.L164:
mov r0, r5
ldmea fp, {r4, r5, fp, sp, pc}
.size dio_send_cur_page, .-dio_send_cur_page
.align 2
.type submit_page_section, %function
submit_page_section:
@ args = 4, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, r5, r6, r7, r8, sl, fp, ip, lr, pc}
sub fp, ip, #4
ldr ip, [r0, #116]
mov r4, r0
cmp ip, r1
mov r5, r1
mov r7, r2
mov r8, r3
ldr sl, [fp, #4]
mov r6, #0
bne .L171
add r2, r0, #120
ldmia r2, {r2, r3}
add r3, r2, r3
ldr r1, [r0, #124]
cmp r3, r7
bne .L171
ldr r2, [r0, #12]
ldr r3, [r0, #128]
add r3, r3, r1, lsr r2
cmp r3, sl
bne .L171
ldr r3, [r0, #44]
add r2, r1, r8
cmp r3, r6
str r2, [r0, #124]
beq .L179
bl dio_send_cur_page
mov r6, r0
ldr r0, [r4, #116]
ldr r3, [r0, #0]
tst r3, #2048
bne .L178
ldr r3, [r0, #4]
cmp r3, #0
streq r3, [r3, #0]
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r0, #4]
sub r3, r3, #1
str r3, [r0, #4]
msr cpsr_c, r2 @ local_irq_restore
cmp r3, #0
bleq __page_cache_release
.L178:
mov r3, #0
str r3, [r4, #116]
b .L179
.L171:
cmp ip, #0
beq .L180
mov r0, r4
bl dio_send_cur_page
mov r6, r0
ldr r0, [r4, #116]
ldr r3, [r0, #0]
tst r3, #2048
bne .L186
ldr r3, [r0, #4]
cmp r3, #0
streq r3, [r3, #0]
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r0, #4]
sub r3, r3, #1
str r3, [r0, #4]
msr cpsr_c, r2 @ local_irq_restore
cmp r3, #0
bleq __page_cache_release
.L186:
mov r3, #0
cmp r6, #0
str r3, [r4, #116]
bne .L179
.L180:
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r5, #4]
add r3, r3, #1
str r3, [r5, #4]
msr cpsr_c, r2 @ local_irq_restore
str sl, [r4, #128]
str r5, [r4, #116]
str r7, [r4, #120]
str r8, [r4, #124]
.L179:
mov r0, r6
ldmea fp, {r4, r5, r6, r7, r8, sl, fp, sp, pc}
.size submit_page_section, .-submit_page_section
.align 2
.type clean_blockdev_aliases, %function
clean_blockdev_aliases:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, r5, fp, ip, lr, pc}
sub fp, ip, #4
ldr r3, [r0, #32]
mov r5, #0
cmp r5, r3
mov r4, r0
bcs .L197
.L195:
ldr r1, [r4, #84]
ldr r0, [r4, #96]
add r1, r1, r5
bl unmap_underlying_metadata
ldr r3, [r4, #32]
add r5, r5, #1
cmp r5, r3
bcc .L195
.L197:
ldmea fp, {r4, r5, fp, sp, pc}
.size clean_blockdev_aliases, .-clean_blockdev_aliases
.align 2
.type dio_zero_block, %function
dio_zero_block:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, r5, fp, ip, lr, pc}
sub fp, ip, #4
sub sp, sp, #4
ldr r3, [r0, #16]
mov r2, #1
cmp r3, #0
mov r4, r0
str r2, [r0, #20]
mov lr, r1
beq .L198
mov ip, r2, asl r3
ldr r3, [r0, #68]
sub r1, ip, #1
tst r3, #32
beq .L198
ldr r3, [r0, #28]
mov r2, #0
ands r5, r3, r1
beq .L198
ldr r3, .L206
cmp lr, r2
ldr r1, [r3, #0]
ldr r3, [r4, #12]
rsbne r5, r5, ip
ldr ip, [r4, #64]
mov r3, r5, asl r3
str ip, [sp, #0]
bl submit_page_section
cmp r0, #0
ldreq r3, [r4, #64]
addeq r3, r3, r5
streq r3, [r4, #64]
.L198:
ldmea fp, {r4, r5, fp, sp, pc}
.L207:
.align 2
.L206:
.word empty_zero_page
.size dio_zero_block, .-dio_zero_block
.global __ashrdi3
.align 2
.type do_direct_IO, %function
do_direct_IO:
@ args = 0, pretend = 0, frame = 8
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc}
sub fp, ip, #4
sub sp, sp, #12
ldr r2, [r0, #28]
ldr r3, [r0, #36]
ldr sl, [r0, #12]
cmp r2, r3
mov r3, #4096
mov r3, r3, lsr sl
mov r2, #0
str r3, [fp, #-44]
str r2, [fp, #-48]
mov r4, r0
add r8, r0, #68
ldr r7, [r0, #40]
bcs .L215
.L285:
mov r0, r4
bl dio_get_page
cmn r0, #1000
mov r6, r0
strhi r0, [fp, #-48]
bhi .L215
ldr r3, [fp, #-44]
cmp r7, r3
bcs .L217
.L278:
ldr r5, [r4, #32]
mov r9, r7, asl sl
cmp r5, #0
bne .L230
mov r0, r4
bl get_more_blocks
cmp r0, #0
str r0, [fp, #-48]
bne .L243
ldr r2, [fp, #-48]
ldr r3, [r8, r2, asl #2]
tst r3, #16
beq .L230
ldr r3, [r8, #20]
ldr r2, [r4, #12]
ldr r1, [r4, #16]
mov r3, r3, lsr r2
str r3, [r4, #32]
ldr r3, [r8, #16]
mov r3, r3, asl r1
str r3, [r4, #64]
ldr r2, [fp, #-48]
ldr r3, [r8, r2, asl #2]
tst r3, #32
movne r0, r4
blne clean_blockdev_aliases
.L231:
ldr r1, [r4, #16]
cmp r1, #0
beq .L230
ldr r2, [fp, #-48]
ldr r3, [r8, r2, asl #2]
mov r2, #1
tst r3, #32
mov r2, r2, asl r1
ldr r1, [r4, #28]
ldreq r3, [r4, #64]
sub r2, r2, #1
and r1, r1, r2
addeq r3, r3, r1
streq r3, [r4, #64]
ldr r3, [r4, #32]
rsb r3, r1, r3
str r3, [r4, #32]
.L230:
ldr r3, [r8, #0]
mov r3, r3, lsr #4
ands r5, r3, #1
bne .L238
ldr r3, [r4, #4]
mov r2, sl
add r3, r3, #52
ldmia r3, {r0-r1}
bl __ashrdi3
ldr r3, [r4, #28]
mov r2, r3
mov r3, #0
cmp r1, r3
bgt .L241
bne .L243
cmp r0, r2
bhi .L241
.L243:
ldr r3, [r6, r5, asl #2]
b .L291
.L241:
ldr r3, .L292
mov r1, #1
ldr r2, [r3, #0]
movs r1, r1, asl sl
rsb r2, r2, r6
mov r2, r2, asr #3
add r3, r2, r2, asl #1
add r3, r3, r3, asl #4
add r3, r3, r3, asl #8
add r3, r3, r3, asl #16
add r2, r2, r3, asl #2
mov r2, r2, asl #12
add r0, r2, #-1073741824
addne r0, r0, r9
blne __memzero
.L251:
ldr r1, [r6, #16]
cmp r1, #0
beq .L254
ldr r2, [r1, #56]
add r3, r1, #56
cmp r2, r3
bne .L254
ldr r2, [r1, #64]
add r3, r1, #64
cmp r2, r3
bne .L254
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r6, #0]
orr r3, r3, #1024
str r3, [r6, #0]
msr cpsr_c, r2 @ local_irq_restore
b .L260
.L254:
mov r0, r6
bl __flush_dcache_page
.L260:
ldr r3, [r4, #28]
add r7, r7, #1
add r3, r3, #1
str r3, [r4, #28]
b .L261
.L238:
ldr r3, [r4, #16]
cmp r3, #0
beq .L262
ldr r1, [r4, #20]
cmp r1, #0
moveq r0, r4
bleq dio_zero_block
.L262:
ldr r1, [r4, #36]
ldr r2, [r4, #28]
ldr r5, [r4, #32]
rsb r3, r9, #4096
mov r3, r3, lsr sl
cmp r5, r3
movcs r5, r3
rsb r3, r2, r1
cmp r5, r3
movcs r5, r3
movs r1, r5, asl sl
streq r1, [r1, #0]
ldr r3, [r8, #0]
ldr ip, [r4, #64]
mov r3, r3, lsr #9
and r3, r3, #1
str r3, [r4, #44]
mov r2, r9
mov r3, r1
mov r0, r4
mov r1, r6
str ip, [sp, #0]
bl submit_page_section
cmp r0, #0
str r0, [fp, #-48]
beq .L269
ldr r3, [r6, #0]
.L291:
tst r3, #2048
bne .L215
ldr r3, [r6, #4]
cmp r3, #0
streq r3, [r3, #0]
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r6, #4]
sub r3, r3, #1
str r3, [r6, #4]
msr cpsr_c, r2 @ local_irq_restore
cmp r3, #0
bne .L215
mov r0, r6
bl __page_cache_release
b .L215
.L269:
ldr r3, [r4, #64]
ldr r2, [r4, #28]
ldr r1, [r4, #32]
add r3, r3, r5
rsb r1, r5, r1
add r2, r2, r5
str r3, [r4, #64]
str r2, [r4, #28]
str r1, [r4, #32]
add r7, r7, r5
.L261:
ldr r3, [r4, #36]
ldr r2, [r4, #28]
cmp r2, r3
movhi r3, #0
strhi r3, [r3, #0]
ldr r2, [r4, #28]
ldr r3, [r4, #36]
cmp r2, r3
beq .L217
ldr r3, [fp, #-44]
cmp r7, r3
bcc .L278
.L217:
ldr r3, [r6, #0]
tst r3, #2048
bne .L284
ldr r3, [r6, #4]
cmp r3, #0
streq r3, [r3, #0]
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r6, #4]
sub r3, r3, #1
str r3, [r6, #4]
msr cpsr_c, r2 @ local_irq_restore
cmp r3, #0
moveq r0, r6
bleq __page_cache_release
.L284:
ldr r2, [r4, #28]
ldr r3, [r4, #36]
mov r7, #0
cmp r2, r3
bcc .L285
.L215:
ldr r0, [fp, #-48]
ldmea fp, {r4, r5, r6, r7, r8, r9, sl, fp, sp, pc}
.L293:
.align 2
.L292:
.word mem_map
.size do_direct_IO, .-do_direct_IO
.align 2
.type direct_io_worker, %function
direct_io_worker:
@ args = 24, pretend = 0, frame = 8
@ frame_needed = 1, uses_anonymous_args = 0
.L297:
mov ip, sp
stmfd sp!, {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc}
sub fp, ip, #4
sub sp, sp, #8
str r0, [fp, #-44]
ldr r0, .L368
mov r9, r1
ldr r0, [r0, #4]
mov r1, #208
str r2, [fp, #-48]
mov sl, r3
ldr r8, [fp, #16]
bl kmem_cache_alloc
cmp r0, #0
mov r5, r0
mov r6, #0
bne .L332
mvn r0, #11
ldmea fp, {r4, r5, r6, r7, r8, r9, sl, fp, sp, pc}
.L367:
mov r0, r5
bl dio_cleanup
b .L340
.L332:
ldr r3, [r9, #16]
mov r4, #0
adds r3, r3, #1
movne r3, #1
str r3, [r0, #432]
str r4, [r0, #0]
ldr r1, [fp, #-48]
mov r7, r4
str r1, [r0, #4]
ldr r2, [fp, #-44]
str r8, [r0, #12]
str r2, [r0, #8]
ldr r3, [r1, #84]
str r4, [r0, #20]
rsb r3, r8, r3
str r3, [r0, #16]
ldmib fp, {r0-r1}
mov r2, r8
bl __ashrdi3
ldr r3, [fp, #12]
str r0, [r5, #28]
cmp r4, r3
mov r3, #1
str r3, [r5, #412]
ldr r3, [fp, #20]
mvn r2, #0
str r3, [r5, #52]
ldr r3, [fp, #24]
str r2, [r5, #64]
str r3, [r5, #56]
str r9, [r5, #428]
str r4, [r5, #32]
str r4, [r5, #116]
str r4, [r5, #44]
str r4, [r5, #48]
str r4, [r5, #104]
str r2, [r5, #60]
str r4, [r5, #408]
str r4, [r5, #436]
str r4, [r5, #416]
str r4, [r5, #420]
str r4, [r5, #424]
str r4, [r5, #24]
bcs .L340
mov r1, sl
.L338:
ldr r2, [r1, #4]
ldr r3, [r5, #24]
ldr r4, [fp, #12]
add r7, r7, #1
add r3, r3, r2, lsr r8
add r3, r3, #2
cmp r7, r4
str r3, [r5, #24]
add r1, r1, #8
bcc .L338
mov r7, #0
cmp r7, r4
bcs .L340
.L345:
mov r3, r7, asl #3
ldr lr, [r3, sl]
add r4, r3, sl
ldr ip, [r4, #4]
mov r3, lr, asl #20
mov r3, r3, lsr #20
cmp r3, #0
add r6, ip, r3
ldr r1, [r5, #28]
mov r3, r3, lsr r8
mov r2, #0
str r3, [r5, #40]
movne r3, #1
add r1, r1, ip, lsr r8
str r2, [r5, #136]
subne ip, r6, #4096
strne r3, [r5, #136]
str r2, [r5, #400]
str r2, [r5, #404]
str r2, [r5, #132]
add r3, ip, #4080
ldr r2, [r5, #136]
add r3, r3, #15
add r2, r2, r3, lsr #12
str r1, [r5, #36]
str r2, [r5, #136]
mov r0, r5
str lr, [r5, #140]
bl do_direct_IO
ldr r2, [r5, #28]
ldr r1, [r5, #36]
ldr r3, [r4, #4]
rsb r1, r2, r1
ldr r2, [r5, #436]
sub r3, r3, r1, asl r8
add r2, r2, r3
cmp r0, #0
add r7, r7, #1
mov r6, r0
str r2, [r5, #436]
bne .L367
ldr r1, [fp, #12]
cmp r7, r1
bcc .L345
.L340:
mov r0, r5
mov r1, #1
bl dio_zero_block
ldr r3, [r5, #116]
cmp r3, #0
beq .L346
mov r0, r5
bl dio_send_cur_page
ldr r1, [r5, #116]
cmp r6, #0
ldr r3, [r1, #0]
moveq r6, r0
tst r3, #2048
bne .L353
ldr r3, [r1, #4]
cmp r3, #0
streq r3, [r3, #0]
mrs r2, cpsr @ local_irq_save
orr r3, r2, #128
msr cpsr_c, r3
ldr r3, [r1, #4]
sub r3, r3, #1
str r3, [r1, #4]
msr cpsr_c, r2 @ local_irq_restore
cmp r3, #0
moveq r0, r1
bleq __page_cache_release
.L353:
mov r3, #0
str r3, [r5, #116]
.L346:
ldr r3, [r5, #0]
cmp r3, #0
movne r0, r5
blne dio_bio_submit
.L354:
mov r0, r5
bl dio_cleanup
ldr r3, [r5, #432]
cmp r3, #0
beq .L355
cmp r6, #0
mov r0, r5
ldreq r6, [r5, #436]
bl finished_one_bio
bl blk_run_queues
b .L357
.L355:
mov r0, r5
bl finished_one_bio
mov r0, r5
bl dio_await_completion
cmp r6, #0
bne .L360
subs r6, r0, #0
bne .L360
ldr r6, [r5, #408]
cmp r6, #0
bne .L360
ldr r1, [r5, #436]
cmp r1, #0
beq .L360
ldr r2, [fp, #-44]
ldr r4, [fp, #-48]
cmp r2, #0
add r3, r4, #52
ldmia r3, {r2-r3}
mov r6, r1
bne .L360
ldmib fp, {r7-r8}
adds r0, r7, r1
adc r1, r8, r6, asr #31
cmp r1, r3
bgt .L363
bne .L360
cmp r0, r2
bls .L360
.L363:
ldr r8, [fp, #4]
rsb r6, r8, r2
.L360:
mov r0, r5
ldmib fp, {r1-r2}
mov r3, r6
bl dio_complete
mov r0, r5
bl kfree
.L357:
mov r0, r6
ldmea fp, {r4, r5, r6, r7, r8, r9, sl, fp, sp, pc}
.L369:
.align 2
.L368:
.word malloc_sizes+72
.size direct_io_worker, .-direct_io_worker
.align 2
.global blockdev_direct_IO
.type blockdev_direct_IO, %function
blockdev_direct_IO:
@ args = 24, pretend = 0, frame = 16
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc}
sub fp, ip, #4
sub sp, sp, #40
str r2, [fp, #-52]
ldr lr, [r2, #84]
mov r5, r3
mov r2, #1
cmp r3, #0
add r3, fp, #8
mov r2, r2, asl lr
ldmia r3, {r6-r7}
mvn r3, #21
str r0, [fp, #-44]
str r1, [fp, #-48]
sub r2, r2, #1
ldr sl, [fp, #4]
ldr r9, [fp, #16]
mov r8, #0
str r3, [fp, #-56]
beq .L371
ldr r3, [r5, #64]
mov r1, #512
ldr ip, [r3, #36]
cmp ip, r8
beq .L373
ldr r3, .L397
ldrh r3, [ip, r3]
cmp r3, r8
movne r1, r3
.L373:
mov r3, r1
mov ip, #8
.L376:
mov r3, r3, lsr #1
cmp r3, #256
add ip, ip, #1
bhi .L376
mov r8, ip
.L371:
and r3, r6, r2
mov r4, #0
orrs r3, r3, r4
beq .L381
cmp r5, #0
movne lr, r8
mov r3, #1
mov r3, r3, asl lr
sub r2, r3, #1
and r3, r6, r2
mov r4, #0
orrs r3, r3, r4
bne .L384
.L381:
mov r1, #0
cmp r1, r9
bcs .L396
.L394:
mov r3, r1, asl #3
ldr r0, [r3, sl]
add r3, r3, sl
tst r0, r2
add r1, r1, #1
ldr ip, [r3, #4]
bne .L390
tst ip, r2
beq .L387
.L390:
cmp r5, #0
movne lr, r8
mov r3, #1
mov r3, r3, asl lr
sub r2, r3, #1
tst r0, r2
bne .L384
tst ip, r2
bne .L384
.L387:
cmp r1, r9
bcc .L394
.L396:
ldr ip, [fp, #20]
ldr r0, [fp, #-44]
str ip, [sp, #16]
ldr ip, [fp, #24]
ldr r1, [fp, #-48]
ldr r2, [fp, #-52]
mov r3, sl
stmia sp, {r6-r7}
str r9, [sp, #8]
str lr, [sp, #12]
str ip, [sp, #20]
bl direct_io_worker
str r0, [fp, #-56]
.L384:
ldr r0, [fp, #-56]
ldmea fp, {r4, r5, r6, r7, r8, r9, sl, fp, sp, pc}
.L398:
.align 2
.L397:
.word 398
.size blockdev_direct_IO, .-blockdev_direct_IO
.section __kcrctab,"a",%progbits
.align 2
.type __kcrctab_blockdev_direct_IO, %object
.size __kcrctab_blockdev_direct_IO, 4
__kcrctab_blockdev_direct_IO:
.word __crc_blockdev_direct_IO
.section __ksymtab_strings,"a",%progbits
.align 2
.type __kstrtab_blockdev_direct_IO, %object
.size __kstrtab_blockdev_direct_IO, 19
__kstrtab_blockdev_direct_IO:
.ascii "blockdev_direct_IO\000"
.section __ksymtab,"a",%progbits
.align 2
.type __ksymtab_blockdev_direct_IO, %object
.size __ksymtab_blockdev_direct_IO, 8
__ksymtab_blockdev_direct_IO:
.word blockdev_direct_IO
.word __kstrtab_blockdev_direct_IO
.weak __crc_blockdev_direct_IO
.ident "GCC: (GNU) 3.3.2"
Attachment:
arm-direct-io.s.ret
Description: Binary data
