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A bunch of gem5 o3 example timelines. Not fully understood, but a good start.

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This commit is contained in:
Ciro Santilli 六四事件 法轮功
2020-07-15 01:00:00 +00:00
parent 144a552cf9
commit 988359440b
7 changed files with 641 additions and 8 deletions
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4
userland/arch/aarch64/freestanding/linux/hazard.S
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@@ -10,7 +10,7 @@ _start:
asm_main_after_prologue:
/* Skip these two instructions to align with the cache line.
* Now that's some proper microbenchmarking!
* https://cirosantilli.com/linux-kernel-module-cheat#gem5-event-queue-minorcpu-syscall-emulation-freestanding-example-analysis-hazardless */
* https://cirosantilli.com/linux-kernel-module-cheat#gem5-event-queue-derivo3cpu-syscall-emulation-freestanding-example-analysis-hazardless */
mov x0, 0
mov x1, 1
@@ -22,7 +22,6 @@ asm_main_after_prologue:
mov x7, 7
mov x8, 8
mov x9, 9
mov x10, 10
mov x11, 11
mov x12, 12
@@ -31,7 +30,6 @@ asm_main_after_prologue:
mov x15, 15
mov x16, 16
mov x17, 17
mov x18, 18
mov x19, 19
mov x20, 20

38
userland/arch/aarch64/freestanding/linux/hazard4.S Normal file
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@@ -0,0 +1,38 @@
/* https://cirosantilli.com/linux-kernel-module-cheat#gem5-event-queue-derivo3cpu-syscall-emulation-freestanding-example-analysis-hazard4 */
.text
.global _start
_start:
asm_main_after_prologue:
mov x0, 0
mov x1, 1
mov x2, 2
add x3, x2, 1
add x4, x3, 1
add x5, x4, 1
add x6, x5, 1
mov x7, 7
mov x8, 8
mov x9, 9
mov x10, 10
mov x11, 11
mov x12, 12
mov x13, 13
mov x14, 14
mov x15, 15
mov x16, 16
mov x17, 17
mov x18, 18
mov x19, 19
mov x20, 20
mov x21, 21
mov x22, 22
mov x23, 23
mov x24, 24
mov x25, 25
/* exit */
mov x0, 0
mov x8, 93
svc 0

42
userland/arch/aarch64/freestanding/linux/speculative.S Normal file
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@@ -0,0 +1,42 @@
/* An example that does not have any CPU pipeline hazards, to observe
* the simpliest possible steady state of CPU execution.
* Useful during microarchitectural analysis such as:
* https://cirosantilli.com/linux-kernel-module-cheat#gem5-event-queue-minorcpu-syscall-emulation-freestanding-example-analysis
*/
.text
.global _start
_start:
asm_main_after_prologue:
/* ifetch 1 */
/* argc */
ldr x0, [sp]
mov x1, 1
/* ifetch 2 */
.Lifetch2:
mov x2, 2
mov x3, 3
mov x4, 4
mov x5, 5
mov x6, 6
/* Check if a CLi argument was passed. */
cmp x0, 2
/* Ensure that we will break out on the next loop. */
mov x0, 3
blt .Lifetch2
mov x10, 10
mov x11, 11
mov x12, 12
mov x13, 13
mov x14, 14
mov x15, 15
mov x16, 16
mov x17, 17
/* exit */
mov x0, 0
mov x8, 93
svc 0

74
userland/arch/aarch64/freestanding/linux/stall-gain.S Normal file
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@@ -0,0 +1,74 @@
/* https://cirosantilli.com/linux-kernel-module-cheat#gem5-event-queue-derivo3cpu-syscall-emulation-freestanding-example-analysis-stall-gain */
.text
.global _start
_start:
asm_main_after_prologue:
mov x0, 0
mov x1, 1
mov x2, 4
mov x3, 5
adr x4, mydata
ldr x5, [x4]
mov x6, 6
mov x7, 7
mov x8, 8
mov x9, 9
mov x10, 10
mov x11, 11
mov x12, 12
mov x13, 13
mov x14, 14
mov x15, 15
mov x16, 16
mov x17, 17
mov x18, 18
mov x19, 19
mov x20, 20
mov x21, 21
mov x22, 22
mov x23, 23
mov x24, 24
mov x25, 25
mov x26, 26
mov x27, 27
mov x28, 28
mov x29, 29
mov x0, 0
mov x1, 1
mov x2, 2
mov x3, 3
mov x4, 4
mov x5, 5
mov x6, 6
mov x7, 7
mov x8, 8
mov x9, 9
mov x10, 10
mov x11, 11
mov x12, 12
mov x13, 13
mov x14, 14
mov x15, 15
mov x16, 16
mov x17, 17
mov x18, 18
mov x19, 19
mov x20, 20
mov x21, 21
mov x22, 22
mov x23, 23
mov x24, 24
mov x25, 25
mov x26, 26
mov x27, 27
mov x28, 28
mov x29, 29
/* exit */
mov x0, 0
mov x8, 93
svc 0
.data
mydata: .skip 16

74
userland/arch/aarch64/freestanding/linux/stall-hazard4.S Normal file
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@@ -0,0 +1,74 @@
/* https://cirosantilli.com/linux-kernel-module-cheat#gem5-event-queue-derivo3cpu-syscall-emulation-freestanding-example-analysis-stall-hazard4 */
.text
.global _start
_start:
asm_main_after_prologue:
mov x0, 0
mov x1, 1
mov x2, 4
mov x3, 5
adr x4, mydata
ldr x5, [x4]
add x6, x5, 1
add x7, x6, 1
add x8, x7, 1
add x9, x8, 1
mov x10, 10
mov x11, 11
mov x12, 12
mov x13, 13
mov x14, 14
mov x15, 15
mov x16, 16
mov x17, 17
mov x18, 18
mov x19, 19
mov x20, 20
mov x21, 21
mov x22, 22
mov x23, 23
mov x24, 24
mov x25, 25
mov x26, 26
mov x27, 27
mov x28, 28
mov x29, 29
mov x0, 0
mov x1, 1
mov x2, 2
mov x3, 3
mov x4, 4
mov x5, 5
mov x6, 6
mov x7, 7
mov x8, 8
mov x9, 9
mov x10, 10
mov x11, 11
mov x12, 12
mov x13, 13
mov x14, 14
mov x15, 15
mov x16, 16
mov x17, 17
mov x18, 18
mov x19, 19
mov x20, 20
mov x21, 21
mov x22, 22
mov x23, 23
mov x24, 24
mov x25, 25
mov x26, 26
mov x27, 27
mov x28, 28
mov x29, 29
/* exit */
mov x0, 0
mov x8, 93
svc 0
.data
mydata: .skip 16

74
userland/arch/aarch64/freestanding/linux/stall.S Normal file
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@@ -0,0 +1,74 @@
/* https://cirosantilli.com/linux-kernel-module-cheat#gem5-event-queue-derivo3cpu-syscall-emulation-freestanding-example-analysis-stall */
.text
.global _start
_start:
asm_main_after_prologue:
mov x0, 0
mov x1, 1
adr x2, mydata
ldr x3, [x2]
mov x4, 4
mov x5, 5
mov x6, 6
mov x7, 7
mov x8, 8
mov x9, 9
mov x10, 10
mov x11, 11
mov x12, 12
mov x13, 13
mov x14, 14
mov x15, 15
mov x16, 16
mov x17, 17
mov x18, 18
mov x19, 19
mov x20, 20
mov x21, 21
mov x22, 22
mov x23, 23
mov x24, 24
mov x25, 25
mov x26, 26
mov x27, 27
mov x28, 28
mov x29, 29
mov x0, 0
mov x1, 1
mov x2, 2
mov x3, 3
mov x4, 4
mov x5, 5
mov x6, 6
mov x7, 7
mov x8, 8
mov x9, 9
mov x10, 10
mov x11, 11
mov x12, 12
mov x13, 13
mov x14, 14
mov x15, 15
mov x16, 16
mov x17, 17
mov x18, 18
mov x19, 19
mov x20, 20
mov x21, 21
mov x22, 22
mov x23, 23
mov x24, 24
mov x25, 25
mov x26, 26
mov x27, 27
mov x28, 28
mov x29, 29
/* exit */
mov x0, 0
mov x8, 93
svc 0
.data
mydata: .skip 16