Register not saved on stack

devver — Tue, 14 May 2019 15:30:01 GMT

Hi,

I'm having an issue with register r31 not being saved on stack. When I compile this code:

--------------------

#include "MPC5644A.h"

void HaltPeripherals(void) {
uint32_t i;

ETPU.ECR_A.B.FEND = 1;
for(i = 0; i < 32; i++) {
ETPU.CHAN[i].CR.B.CPR = 0;
}
ETPU.CISR_A.R = 0xFFFFFFFF;
ETPU.CIOSR_A.R = 0xFFFFFFFF;

PIT.TIMER[0].TCTRL.B.TEN = 0x0;
PIT.TIMER[1].TCTRL.B.TEN = 0x0;
PIT.TIMER[2].TCTRL.B.TEN = 0x0;
PIT.PITMCR.B.MDIS = 1;

ESCI_A.LCR.B.LIN = 0;
ESCI_A.CR2.B.MDIS = 1;
ESCI_B.LCR.B.LIN = 0;
ESCI_B.CR2.B.MDIS = 1;

ETPU.ECR_A.B.MDIS = 0;

CAN_A.MCR.B.MDIS = 0;
CAN_C.MCR.B.MDIS = 0;
for(i = 0; i < 364; i++) {
INTC.PSR[i].R = 0;
}
}

--------------------

It generates this code:

0: 18 21 06 f0 e_stwu r1,-16(r1)
4: 70 f8 e3 fc e_lis r7,50172
8: 1b c1 09 08 e_stmw r30,8(r1)
c: 48 14 se_li r4,1
e: c5 57 se_lwz r5,20(r7)
10: 48 06 se_li r6,0
12: 74 85 f8 00 e_rlwimi r5,r4,31,0,0
16: 48 04 se_li r4,0
18: d5 57 se_stw r5,20(r7)
1a: 4a 07 se_li r7,32
1c: 00 b7 se_mtctr r7
1e: 18 e6 80 40 e_addi r7,r6,64
22: 71 78 e3 fc e_lis r11,50172
26: 6c 47 se_slwi r7,4
28: 48 03 se_li r3,0
2a: 7c e7 5a 14 add r7,r7,r11
2e: 20 06 se_addi r6,1
30: c0 57 se_lwz r5,0(r7)
32: 74 85 e0 86 e_rlwimi r5,r4,28,2,3
36: d0 57 se_stw r5,0(r7)
38: 7a 20 ff e6 e_bdnz 1e <HaltPeripherals+0x1e>
3c: 70 f8 e3 ff e_lis r7,50175
40: 71 40 58 00 e_li r10,-327680
44: 2c 06 se_bmaski r6,0
46: 70 10 78 00 e_li r0,-32768
4a: 54 cb 02 00 e_stw r6,512(r11)
4e: 71 80 60 00 e_li r12,-262144
52: 54 cb 02 20 e_stw r6,544(r11)
56: 71 20 58 00 e_li r9,-327680
5a: 50 c7 01 08 e_lwz r6,264(r7)
5e: 19 29 d1 40 e_ori r9,r9,16384
62: 74 66 07 fe e_rlwimi r6,r3,0,31,31
66: 71 00 60 00 e_li r8,-262144
6a: 54 c7 01 08 e_stw r6,264(r7)
6e: 19 08 d1 80 e_ori r8,r8,32768
72: 53 e7 01 18 e_lwz r31,280(r7)
76: 70 9f e7 f4 e_lis r4,65524
7a: 74 7f 07 fe e_rlwimi r31,r3,0,31,31
7e: 48 1e se_li r30,1
80: 57 e7 01 18 e_stw r31,280(r7)
84: 48 06 se_li r6,0
86: 73 e0 01 6c e_li r31,364
8a: 65 04 se_bseti r4,16
8c: 00 bf se_mtctr r31
8e: 48 05 se_li r5,0
90: 53 e7 01 28 e_lwz r31,296(r7)
94: 74 7f 07 fe e_rlwimi r31,r3,0,31,31
98: 57 e7 01 28 e_stw r31,296(r7)
9c: c0 f7 se_lwz r31,0(r7)
9e: 77 df 0f bc e_rlwimi r31,r30,1,30,30
a2: d0 f7 se_stw r31,0(r7)
a4: 50 ea 00 0c e_lwz r7,12(r10)
a8: 74 67 c1 ce e_rlwimi r7,r3,24,7,7
ac: 54 ea 00 0c e_stw r7,12(r10)
b0: 58 ea 00 04 e_lhz r7,4(r10)
b4: 44 07 se_or r7,r0
b6: 5c ea 00 04 e_sth r7,4(r10)
ba: 50 e9 00 0c e_lwz r7,12(r9)
be: 74 67 c1 ce e_rlwimi r7,r3,24,7,7
c2: 54 e9 00 0c e_stw r7,12(r9)
c6: 58 e9 00 04 e_lhz r7,4(r9)
ca: 44 70 se_or r0,r7
cc: 5c 09 00 04 e_sth r0,4(r9)
d0: 50 eb 00 14 e_lwz r7,20(r11)
d4: 74 67 f0 42 e_rlwimi r7,r3,30,1,1
d8: 54 eb 00 14 e_stw r7,20(r11)
dc: 50 ec 00 00 e_lwz r7,0(r12)
e0: 74 67 f8 00 e_rlwimi r7,r3,31,0,0
e4: 54 ec 00 00 e_stw r7,0(r12)
e8: 50 e8 00 00 e_lwz r7,0(r8)
ec: 74 67 f8 00 e_rlwimi r7,r3,31,0,0
f0: 54 e8 00 00 e_stw r7,0(r8)
f4: 7c e4 32 14 add r7,r4,r6
f8: 20 06 se_addi r6,1
fa: 34 a7 00 40 e_stb r5,64(r7)
fe: 7a 20 ff f6 e_bdnz f4 <HaltPeripherals+0xf4>
102: 1b c1 08 08 e_lmw r30,8(r1)
106: 20 f1 se_addi r1,16
108: 00 04 se_blr

--------------------

The full command prompt I use to compile:

"C:/SysGCC/powerpc-eabi/bin/powerpc-eabivle-gcc.exe" -c -O2 -g3 -Wall -c -fmessage-length=0 -ffunction-sections -fdata-sections -mcpu=e200z3 -mbig -mvle -mregnames -mhard-float -meabi -Werror -specs="C:/SysGCC/powerpc-eabi/powerpc-eabivle/lib/e200z3/nosys.specs" -I"C:/SysGCC/powerpc-eabi/powerpc-eabivle/include" --sysroot="C:/SysGCC/powerpc-eabi/powerpc-eabivle/lib/e200z3/" -MMD -MP -MF"Test.d" -MT"Test.o" -c -o "Test.o" "Test.c"

The version I'm using:

powerpc-eabivle-gcc.exe (BLD = 1607) 4.9.4 20160726 (build.sh rev=gceb1328 s=F494 -i /opt/freescale ELe200 -V release_gceb1328_build_Fed_ELe200_ML3)

Can you please help out?

Thanks in advance.

Re: Register not saved on stack

martin_kovar — Mon, 20 May 2019 10:44:24 GMT

Hello,

when I checked your command like settings, I can see you use -mcpu=e200z3, but MPC5644A has e200z4 core. From my point of view, all lines which uses e200z3 core should be switched to e200z4.

Regards,

Martin

Re: Register not saved on stack

ra8797 — Thu, 23 May 2019 21:09:29 GMT

This instruction:

8: 1b c1 09 08 e_stmw r30,8(r1)

It is a store multiple words. It saves registers r30 and r31 on stack.

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