https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108575
Bug ID: 108575
Summary: Bug in gcc arm non eabi
Product: gcc
Version: 10.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: ergasies.uni at gmail dot com
Target Milestone: ---
Created attachment 54363
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54363&action=edit
i files and some screenshots.
Hi,
I use the gcc-arm-none-eabi-10.3-2021.10 version. I working on Fedora 29.
My C Code is auto-generated from Simulink.
The following code is the function call.
/* ModelReference: '<Root>/AngleCalculation' incorporates:
* DataStoreRead: '<Root>/Data Store Read'
* Inport: '<Root>/Input'
* Inport: '<Root>/Input1'
* UnitDelay: '<Root>/Unit Delay'
*/
ConvertPWMtoAngle(&qSoll, &rtb_UnitDelay_n, &UnitDelay_DSTATE,
&rtb_AngleCalculation_o1, &Sig_MechanicalAngle);
and this is the declaration of the function.
/* Output and update for referenced model: 'ConvertPWMtoAngle' */
void ConvertPWMtoAngle(const int16_T *rtu_qSollin, const boolean_T
*rtu_detectStartUpin, const real32_T *rtu_AngleMecIn, real32_T
*rty_AngleElec,
real32_T *rty_AnlgleMec)
The global variable Sig_MechanicalAngle according to map file has the address
0x0000000020004c94.
In the function ConvertPWMtoAngle the implementation looks like this:
continuesAngle = (degresProCounter * (real32_T)rtb_Switch_d) +
(*rtu_AngleMecIn);
and the assembly looks like this:
0800837C 4B14 LDR R3, =EncoderCounter ; [PC,
#80] [0x080083D0] =0x20000224
0800837E 881B LDRH R3, [R3]
08008380 4A0E LDR R2, =ConvertPWMtoAngle_DW ; [PC,
#56] [0x080083BC] =0x20004CF0
08008382 8912 LDRH R2, [R2, #8]
08008384 1A9B SUBS R3, R3, R2
08008386 B21B SXTH R3, R3
08008388 EE07 3A90 VMOV S15, R3
0800838C EEF8 7AE7 VCVT.F32.S32 S15, S15
08008390 4B15 LDR R3, =degresProCounter ; [PC,
#84] [0x080083E8] =0x080102E0
08008392 ED93 7A00 VLDR S14, [R3]
08008396 EE67 7A87 VMUL.F32 S15, S15, S14
0800839A ED96 7A00 VLDR S14, [R6]
0800839E EE77 7A87 VADD.F32 S15, S15, S14
080083A2 4B12 LDR R3, =continuesAngle ; [PC,
#72] [0x080083EC] =0x20004D0C
080083A4 EDC3 7A00 VSTR S15, [R3]
080083A8 E7CC B 0x08008344 ;
<ConvertPWMtoAngle>+0x11C
in line 0800839A ED96 7A00 VLDR S14, [R6]
the controller loads from the memory address in R6 the value in S14.
But when I check the register R6 Value the has the address value 2001 1548 and
this is not the correct address, this is not the address from variable
Sig_MechanicalAngle. And always the Register S14 has the value 0. The address
2001 1548 exist not in my map file as variable.
This is the map entry in this address area:
0x0000000020011394 testTask500msHandle
0x0000000020011398 ComputationINTBuffer
0x0000000020011598 testTask500msBuffer
COMMON 0x0000000020011d98 0x2c ./Core/Src/main.o
0x0000000020011d98 ClockInfos
0x0000000020011dac adcBuffer
I changed my implementation to continuesAngle = (degresProCounter *
(real32_T)rtb_Switch_d) +
(Sig_MechanicalAngle); and the software is working properly.
I checked also my stack and i did not find a stack overflow.
That means when I use a pointer I have a big trouble and when I use the object
of the variable then everything is ok.
Could you help me and see if is it a bug?
