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/* Copyright (C) 2018 Adam Green (https://github.com/adamgreen)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/* Implementation of code to generate various crash scenarios for testing. */
.text
.syntax unified
.global testMspMultipleOf8
.type testMspMultipleOf8, %function
.thumb_func
/* extern "C" void testMspMultipleOf8(void);
Uses MSP and has it pointing to an even multiple of 8.
*/
testMspMultipleOf8:
// Make SP, an even multiple of 8.
mov r0, sp
movs r1, #4
bics r0, r1
mov sp, r0
// Load 0xFFFFFFFF into LR
movs r1, #1
rsbs r0, r1, #0
mov lr, r0
// Load known values into R0-R12
movs r0, #0
// r1 was already set correctly above when initializing LR.
movs r2, #2
movs r3, #3
movs r4, #4
movs r5, #5
movs r6, #6
movs r7, #7
mov r8, r7
mov r9, r7
mov r10, r7
mov r11, r7
mov r12, r7
add r8, r1
add r9, r2
add r10, r3
add r11, r4
add r12, r5
// Generate a hard fault by executing an undefined instruction.
.word 0xDE00
// CrashCatcher_Entry() shouldn't return but if it does, just infinite loop here.
b .
// Let assembler know that we have hit the end of the function.
.pool
.size testMspMultipleOf8, .-testMspMultipleOf8
.global testMspNotMultipleOf8
.type testMspNotMultipleOf8, %function
.thumb_func
/* extern "C" void testMspNotMultipleOf8(void);
Uses MSP and has it not pointing to an even multiple of 8.
*/
testMspNotMultipleOf8:
// Make SP, not an even multiple of 8.
mov r0, sp
subs r0, #8
movs r1, #4
orrs r0, r1
mov sp, r0
// Load 0xFFFFFFFF into LR
movs r1, #1
rsbs r0, r1, #0
mov lr, r0
// Load known values into R0-R12
movs r0, #0
// r1 was already set correctly above when initializing LR.
movs r2, #2
movs r3, #3
movs r4, #4
movs r5, #5
movs r6, #6
movs r7, #7
mov r8, r7
mov r9, r7
mov r10, r7
mov r11, r7
mov r12, r7
add r8, r1
add r9, r2
add r10, r3
add r11, r4
add r12, r5
// Generate a hard fault by executing an undefined instruction.
.word 0xDE00
// CrashCatcher_Entry() shouldn't return but if it does, just infinite loop here.
b .
// Let assembler know that we have hit the end of the function.
.pool
.size testMspNotMultipleOf8, .-testMspNotMultipleOf8
.global testPspMultipleOf8
.type testPspMultipleOf8, %function
.thumb_func
/* extern "C" void testPspMultipleOf8(void);
Uses MSP and has it pointing to an even multiple of 8.
*/
testPspMultipleOf8:
// Make PSP, an even multiple of 8.
mov r0, sp
movs r1, #4
bics r0, r1
msr psp, r0
// Switch to use of PSP.
movs r0, #3
msr control,r0
// Flush instructions so that control mods take effect.
isb
// Load 0xFFFFFFFF into LR
movs r1, #1
rsbs r0, r1, #0
mov lr, r0
// Load known values into R0-R12
movs r0, #0
// r1 was already set correctly above when initializing LR.
movs r2, #2
movs r3, #3
movs r4, #4
movs r5, #5
movs r6, #6
movs r7, #7
mov r8, r7
mov r9, r7
mov r10, r7
mov r11, r7
mov r12, r7
add r8, r1
add r9, r2
add r10, r3
add r11, r4
add r12, r5
// Generate a hard fault by executing an undefined instruction.
.word 0xDE00
// CrashCatcher_Entry() shouldn't return but if it does, just infinite loop here.
b .
// Let assembler know that we have hit the end of the function.
.pool
.size testPspMultipleOf8, .-testPspMultipleOf8
.global testBreakpoints
.type testBreakpoints, %function
.thumb_func
/* extern "C" void testBreakpoints(void);
Set registers to known values, breakpoint, allow continuation, and breakpoint again to see if anything changed.
*/
testBreakpoints:
// Save away non-volatile registers that will be modified for testing.
mov r0, r8
mov r1, r9
mov r2, r10
mov r3, r11
push {r0-r7}
// Load incrementing values into R0-R12
movs r0, #0
movs r1, #1
movs r2, #2
movs r3, #3
movs r4, #4
movs r5, #5
movs r6, #6
movs r7, #7
mov r8, r7
mov r9, r7
mov r10, r7
mov r11, r7
mov r12, r7
add r8, r1
add r9, r2
add r10, r3
add r11, r4
add r12, r5
// Issue one hard coded breakpoint.
bkpt #0
// Issue another hard coded breakpoint and see if dumps contain same values for all registers other than PC.
bkpt #255
// Restore non-volatile registers and return to caller.
pop {r0-r7}
mov r8, r0
mov r9, r1
mov r10, r2
mov r11, r3
bx lr
// Let assembler know that we have hit the end of the function.
.pool
.size testBreakpoints, .-testBreakpoints
#if defined(TARGET_M4)
.global testInitFPURegisters
.type testInitFPURegisters, %function
.thumb_func
/* extern "C" void testInitFPURegisters(void);
Initialize FPU registers to known values.
*/
testInitFPURegisters:
vmov.f32 s0, #-1.0
vmov.f32 s1, #1.0
vmov.f32 s2, #2.0
vmov.f32 s3, #3.0
vmov.f32 s4, #4.0
vmov.f32 s5, #5.0
vmov.f32 s6, #6.0
vmov.f32 s7, #7.0
vmov.f32 s8, #8.0
vmov.f32 s9, #9.0
vmov.f32 s10, #10.0
vmov.f32 s11, #11.0
vmov.f32 s12, #12.0
vmov.f32 s13, #13.0
vmov.f32 s14, #14.0
vmov.f32 s15, #15.0
vmov.f32 s16, #16.0
vmov.f32 s17, #17.0
vmov.f32 s18, #18.0
vmov.f32 s19, #19.0
vmov.f32 s20, #20.0
vmov.f32 s21, #21.0
vmov.f32 s22, #22.0
vmov.f32 s23, #23.0
vmov.f32 s24, #24.0
vmov.f32 s25, #25.0
vmov.f32 s26, #26.0
vmov.f32 s27, #27.0
vmov.f32 s28, #28.0
vmov.f32 s29, #29.0
vmov.f32 s30, #30.0
vmov.f32 s31, #31.0
ldr r0, =0xBAADFEED
vmsr fpscr, r0
bx lr
.pool
.size testInitFPURegisters, .-testInitFPURegisters
#else
.global testInitFPURegisters
.type testInitFPURegisters, %function
.thumb_func
/* extern "C" void testInitFPURegisters(void);
Initialize FPU registers to known values.
*/
testInitFPURegisters:
bx lr
.pool
.size testInitFPURegisters, .-testInitFPURegisters
#endif
.end
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