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polishing the Notes.md

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Per 2019-09-29 15:40:48 +02:00
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39
Notes.md
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@ -148,28 +148,25 @@ Overall, using this approach, we don't need a trampoline (`run`). We reduce the
The `examples/lockopt.rs` shows that locks are effectively optimized out.
``` asm
00000132 <GPIOB>:
132: b510 push {r4, lr}
134: f000 f893 bl 25e <__basepri_r>
138: 4604 mov r4, r0
13a: 20a0 movs r0, #160 ; 0xa0
13c: f000 f892 bl 264 <__basepri_w>
140: f240 0000 movw r0, #0
144: f2c2 0000 movt r0, #8192 ; 0x2000
148: 6801 ldr r1, [r0, #0]
14a: 3101 adds r1, #1
14c: 6001 str r1, [r0, #0]
14e: 4620 mov r0, r4
150: e8bd 4010 ldmia.w sp!, {r4, lr}
154: f000 b886 b.w 264 <__basepri_w>
00000128 <GPIOB>:
128: 21a0 movs r1, #160 ; 0xa0
12a: f3ef 8011 mrs r0, BASEPRI
12e: f381 8811 msr BASEPRI, r1
132: f240 0100 movw r1, #0
136: f2c2 0100 movt r1, #8192 ; 0x2000
13a: 680a ldr r2, [r1, #0]
13c: 3201 adds r2, #1
13e: 600a str r2, [r1, #0]
140: f380 8811 msr BASEPRI, r0
144: 4770 bx lr
00000158 <GPIOC>:
158: f240 0000 movw r0, #0
15c: f2c2 0000 movt r0, #8192 ; 0x2000
160: 6801 ldr r1, [r0, #0]
162: 3102 adds r1, #2
164: 6001 str r1, [r0, #0]
166: 4770 bx lr
00000146 <GPIOC>:
146: f240 0000 movw r0, #0
14a: f2c2 0000 movt r0, #8192 ; 0x2000
14e: 6801 ldr r1, [r0, #0]
150: 3102 adds r1, #2
152: 6001 str r1, [r0, #0]
154: 4770 bx lr
```
GPIOB/C are sharing a resource (C higher prio). Notice, there is no BASEPRI manipulation at all.

303
lockopt.asm
View file

@ -5,188 +5,161 @@ target/thumbv7m-none-eabi/release/examples/lockopt: file format elf32-little
Disassembly of section .text:
000000f0 <GPIOA>:
f0: b510 push {r4, lr}
f2: f000 f8b4 bl 25e <__basepri_r>
f6: 4604 mov r4, r0
f8: 20a0 movs r0, #160 ; 0xa0
fa: f000 f8b3 bl 264 <__basepri_w>
fe: f240 0000 movw r0, #0
102: f2c2 0000 movt r0, #8192 ; 0x2000
106: 6801 ldr r1, [r0, #0]
108: 3101 adds r1, #1
10a: 6001 str r1, [r0, #0]
10c: f24e 2000 movw r0, #57856 ; 0xe200
110: 2102 movs r1, #2
112: f2ce 0000 movt r0, #57344 ; 0xe000
116: 6001 str r1, [r0, #0]
118: 2104 movs r1, #4
11a: 6001 str r1, [r0, #0]
11c: 4620 mov r0, r4
11e: f000 f8a1 bl 264 <__basepri_w>
122: 2126 movs r1, #38 ; 0x26
124: 2018 movs r0, #24
126: f2c0 0102 movt r1, #2
12a: e8bd 4010 ldmia.w sp!, {r4, lr}
12e: f000 b88e b.w 24e <__syscall>
f0: 21a0 movs r1, #160 ; 0xa0
f2: f3ef 8011 mrs r0, BASEPRI
f6: f381 8811 msr BASEPRI, r1
fa: f240 0100 movw r1, #0
fe: f2c2 0100 movt r1, #8192 ; 0x2000
102: 680a ldr r2, [r1, #0]
104: 3201 adds r2, #1
106: 600a str r2, [r1, #0]
108: f24e 2100 movw r1, #57856 ; 0xe200
10c: 2202 movs r2, #2
10e: f2ce 0100 movt r1, #57344 ; 0xe000
112: 600a str r2, [r1, #0]
114: 2204 movs r2, #4
116: 600a str r2, [r1, #0]
118: 2126 movs r1, #38 ; 0x26
11a: f380 8811 msr BASEPRI, r0
11e: f2c0 0102 movt r1, #2
122: 2018 movs r0, #24
124: f000 b887 b.w 236 <__syscall>
00000132 <GPIOB>:
132: b510 push {r4, lr}
134: f000 f893 bl 25e <__basepri_r>
138: 4604 mov r4, r0
13a: 20a0 movs r0, #160 ; 0xa0
13c: f000 f892 bl 264 <__basepri_w>
140: f240 0000 movw r0, #0
144: f2c2 0000 movt r0, #8192 ; 0x2000
148: 6801 ldr r1, [r0, #0]
14a: 3101 adds r1, #1
14c: 6001 str r1, [r0, #0]
14e: 4620 mov r0, r4
150: e8bd 4010 ldmia.w sp!, {r4, lr}
154: f000 b886 b.w 264 <__basepri_w>
00000128 <GPIOB>:
128: 21a0 movs r1, #160 ; 0xa0
12a: f3ef 8011 mrs r0, BASEPRI
12e: f381 8811 msr BASEPRI, r1
132: f240 0100 movw r1, #0
136: f2c2 0100 movt r1, #8192 ; 0x2000
13a: 680a ldr r2, [r1, #0]
13c: 3201 adds r2, #1
13e: 600a str r2, [r1, #0]
140: f380 8811 msr BASEPRI, r0
144: 4770 bx lr
00000158 <GPIOC>:
158: f240 0000 movw r0, #0
15c: f2c2 0000 movt r0, #8192 ; 0x2000
160: 6801 ldr r1, [r0, #0]
162: 3102 adds r1, #2
164: 6001 str r1, [r0, #0]
166: 4770 bx lr
00000146 <GPIOC>:
146: f240 0000 movw r0, #0
14a: f2c2 0000 movt r0, #8192 ; 0x2000
14e: 6801 ldr r1, [r0, #0]
150: 3102 adds r1, #2
152: 6001 str r1, [r0, #0]
154: 4770 bx lr
00000168 <main>:
168: f000 f873 bl 252 <__cpsid>
16c: f24e 1000 movw r0, #57600 ; 0xe100
170: f24e 4201 movw r2, #58369 ; 0xe401
174: f2ce 0000 movt r0, #57344 ; 0xe000
178: 21e0 movs r1, #224 ; 0xe0
17a: f880 1300 strb.w r1, [r0, #768] ; 0x300
17e: 2101 movs r1, #1
180: f2ce 0200 movt r2, #57344 ; 0xe000
184: 23c0 movs r3, #192 ; 0xc0
186: 6001 str r1, [r0, #0]
188: 7013 strb r3, [r2, #0]
18a: 2302 movs r3, #2
18c: 6003 str r3, [r0, #0]
18e: 23a0 movs r3, #160 ; 0xa0
190: 7053 strb r3, [r2, #1]
192: 2204 movs r2, #4
194: 6002 str r2, [r0, #0]
196: f64e 5210 movw r2, #60688 ; 0xed10
19a: f2ce 0200 movt r2, #57344 ; 0xe000
19e: 6813 ldr r3, [r2, #0]
1a0: f043 0302 orr.w r3, r3, #2
1a4: 6013 str r3, [r2, #0]
1a6: f8c0 1100 str.w r1, [r0, #256] ; 0x100
1aa: f000 f854 bl 256 <__cpsie>
1ae: f000 f854 bl 25a <__wfi>
1b2: e7fc b.n 1ae <main+0x46>
00000156 <main>:
156: f24e 1000 movw r0, #57600 ; 0xe100
15a: f24e 4201 movw r2, #58369 ; 0xe401
15e: f2ce 0000 movt r0, #57344 ; 0xe000
162: 21e0 movs r1, #224 ; 0xe0
164: b672 cpsid i
166: f880 1300 strb.w r1, [r0, #768] ; 0x300
16a: 2101 movs r1, #1
16c: f2ce 0200 movt r2, #57344 ; 0xe000
170: 23c0 movs r3, #192 ; 0xc0
172: 6001 str r1, [r0, #0]
174: 7013 strb r3, [r2, #0]
176: 2302 movs r3, #2
178: 6003 str r3, [r0, #0]
17a: 23a0 movs r3, #160 ; 0xa0
17c: 7053 strb r3, [r2, #1]
17e: 2204 movs r2, #4
180: 6002 str r2, [r0, #0]
182: f64e 5210 movw r2, #60688 ; 0xed10
186: f2ce 0200 movt r2, #57344 ; 0xe000
18a: 6813 ldr r3, [r2, #0]
18c: f043 0302 orr.w r3, r3, #2
190: 6013 str r3, [r2, #0]
192: f8c0 1100 str.w r1, [r0, #256] ; 0x100
196: b662 cpsie i
198: bf30 wfi
19a: e7fd b.n 198 <main+0x42>
000001b4 <Reset>:
1b4: f000 f84a bl 24c <DefaultPreInit>
1b8: f240 0004 movw r0, #4
1bc: f240 0100 movw r1, #0
1c0: f2c2 0000 movt r0, #8192 ; 0x2000
1c4: f2c2 0100 movt r1, #8192 ; 0x2000
1c8: 4281 cmp r1, r0
1ca: d214 bcs.n 1f6 <Reset+0x42>
1cc: f240 0100 movw r1, #0
1d0: 2200 movs r2, #0
1d2: f2c2 0100 movt r1, #8192 ; 0x2000
0000019c <Reset>:
19c: f000 f84a bl 234 <DefaultPreInit>
1a0: f240 0004 movw r0, #4
1a4: f240 0100 movw r1, #0
1a8: f2c2 0000 movt r0, #8192 ; 0x2000
1ac: f2c2 0100 movt r1, #8192 ; 0x2000
1b0: 4281 cmp r1, r0
1b2: d214 bcs.n 1de <Reset+0x42>
1b4: f240 0100 movw r1, #0
1b8: 2200 movs r2, #0
1ba: f2c2 0100 movt r1, #8192 ; 0x2000
1be: f841 2b04 str.w r2, [r1], #4
1c2: 4281 cmp r1, r0
1c4: bf3c itt cc
1c6: f841 2b04 strcc.w r2, [r1], #4
1ca: 4281 cmpcc r1, r0
1cc: d207 bcs.n 1de <Reset+0x42>
1ce: f841 2b04 str.w r2, [r1], #4
1d2: 4281 cmp r1, r0
1d4: d203 bcs.n 1de <Reset+0x42>
1d6: f841 2b04 str.w r2, [r1], #4
1da: 4281 cmp r1, r0
1dc: bf3c itt cc
1de: f841 2b04 strcc.w r2, [r1], #4
1e2: 4281 cmpcc r1, r0
1e4: d207 bcs.n 1f6 <Reset+0x42>
1e6: f841 2b04 str.w r2, [r1], #4
1ea: 4281 cmp r1, r0
1ec: d203 bcs.n 1f6 <Reset+0x42>
1ee: f841 2b04 str.w r2, [r1], #4
1f2: 4281 cmp r1, r0
1f4: d3ef bcc.n 1d6 <Reset+0x22>
1f6: f240 0000 movw r0, #0
1fa: f240 0100 movw r1, #0
1fe: f2c2 0000 movt r0, #8192 ; 0x2000
202: f2c2 0100 movt r1, #8192 ; 0x2000
206: 4281 cmp r1, r0
208: d21c bcs.n 244 <Reset+0x90>
20a: f240 2180 movw r1, #640 ; 0x280
20e: f240 0200 movw r2, #0
212: f2c0 0100 movt r1, #0
216: f2c2 0200 movt r2, #8192 ; 0x2000
21a: 680b ldr r3, [r1, #0]
21c: f842 3b04 str.w r3, [r2], #4
220: 4282 cmp r2, r0
222: d20f bcs.n 244 <Reset+0x90>
224: 684b ldr r3, [r1, #4]
226: f842 3b04 str.w r3, [r2], #4
22a: 4282 cmp r2, r0
22c: bf3e ittt cc
22e: 688b ldrcc r3, [r1, #8]
230: f842 3b04 strcc.w r3, [r2], #4
234: 4282 cmpcc r2, r0
236: d205 bcs.n 244 <Reset+0x90>
238: 68cb ldr r3, [r1, #12]
23a: 3110 adds r1, #16
23c: f842 3b04 str.w r3, [r2], #4
240: 4282 cmp r2, r0
242: d3ea bcc.n 21a <Reset+0x66>
244: f7ff ff90 bl 168 <main>
248: defe udf #254 ; 0xfe
1dc: d3ef bcc.n 1be <Reset+0x22>
1de: f240 0000 movw r0, #0
1e2: f240 0100 movw r1, #0
1e6: f2c2 0000 movt r0, #8192 ; 0x2000
1ea: f2c2 0100 movt r1, #8192 ; 0x2000
1ee: 4281 cmp r1, r0
1f0: d21c bcs.n 22c <Reset+0x90>
1f2: f240 2150 movw r1, #592 ; 0x250
1f6: f240 0200 movw r2, #0
1fa: f2c0 0100 movt r1, #0
1fe: f2c2 0200 movt r2, #8192 ; 0x2000
202: 680b ldr r3, [r1, #0]
204: f842 3b04 str.w r3, [r2], #4
208: 4282 cmp r2, r0
20a: d20f bcs.n 22c <Reset+0x90>
20c: 684b ldr r3, [r1, #4]
20e: f842 3b04 str.w r3, [r2], #4
212: 4282 cmp r2, r0
214: bf3e ittt cc
216: 688b ldrcc r3, [r1, #8]
218: f842 3b04 strcc.w r3, [r2], #4
21c: 4282 cmpcc r2, r0
21e: d205 bcs.n 22c <Reset+0x90>
220: 68cb ldr r3, [r1, #12]
222: 3110 adds r1, #16
224: f842 3b04 str.w r3, [r2], #4
228: 4282 cmp r2, r0
22a: d3ea bcc.n 202 <Reset+0x66>
22c: f7ff ff93 bl 156 <main>
230: defe udf #254 ; 0xfe
0000024a <DefaultHandler_>:
24a: Address 0x000000000000024a is out of bounds.
00000232 <DefaultHandler_>:
232: Address 0x0000000000000232 is out of bounds.
0000024b <ADC0_SEQUENCE_0>:
24b: Address 0x000000000000024b is out of bounds.
00000233 <ADC0_SEQUENCE_0>:
233: Address 0x0000000000000233 is out of bounds.
0000024c <DefaultPreInit>:
24c: Address 0x000000000000024c is out of bounds.
00000234 <DefaultPreInit>:
234: Address 0x0000000000000234 is out of bounds.
0000024d <__pre_init>:
24d: Address 0x000000000000024d is out of bounds.
00000235 <__pre_init>:
235: Address 0x0000000000000235 is out of bounds.
0000024e <__syscall>:
24e: beab bkpt 0x00ab
250: 4770 bx lr
00000236 <__syscall>:
236: beab bkpt 0x00ab
238: 4770 bx lr
00000252 <__cpsid>:
252: b672 cpsid i
254: 4770 bx lr
0000023a <HardFaultTrampoline>:
23a: 4670 mov r0, lr
23c: 2104 movs r1, #4
23e: 4208 tst r0, r1
240: d102 bne.n 248 <HardFaultTrampoline+0xe>
242: f3ef 8008 mrs r0, MSP
246: e002 b.n 24e <HardFault_>
248: f3ef 8009 mrs r0, PSP
24c: e7ff b.n 24e <HardFault_>
00000256 <__cpsie>:
256: b662 cpsie i
258: 4770 bx lr
0000025a <__wfi>:
25a: bf30 wfi
25c: 4770 bx lr
0000025e <__basepri_r>:
25e: f3ef 8011 mrs r0, BASEPRI
262: 4770 bx lr
00000264 <__basepri_w>:
264: f380 8811 msr BASEPRI, r0
268: 4770 bx lr
0000026a <HardFaultTrampoline>:
26a: 4670 mov r0, lr
26c: 2104 movs r1, #4
26e: 4208 tst r0, r1
270: d102 bne.n 278 <HardFaultTrampoline+0xe>
272: f3ef 8008 mrs r0, MSP
276: e002 b.n 27e <HardFault_>
278: f3ef 8009 mrs r0, PSP
27c: e7ff b.n 27e <HardFault_>
0000027e <HardFault_>:
27e: Address 0x000000000000027e is out of bounds.
0000024e <HardFault_>:
24e: Address 0x000000000000024e is out of bounds.
0000027f <HardFault>:
27f: Address 0x000000000000027f is out of bounds.
0000024f <HardFault>:
24f: Address 0x000000000000024f is out of bounds.