[Bug target/41999] Bug in generation of interrupt function code for ARM processor
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41999
Domen Puncer domen at cba dot si changed:
What|Removed |Added
CC||domen at cba dot si
--- Comment #3 from Domen Puncer domen at cba dot si 2011-06-16 08:23:25 UTC
---
FWIW, this and 45540 don't happen on gcc 4.5.2 anymore (confirmed that it DOES
happen on 2010q1-188 4.4.1):
irq_:
@ Interrupt Service Routine.
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
sublr, lr, #4
stmfdsp!, {r0, r1, r2, r3, r4, r5, ip, lr}
ldrr4, .L2
ldrr0, [r4, #0]
blexternal
ldrr0, [r4, #0]
movr3, r0, asl #1
movr0, r3
strr3, [r4, #0]
blexternal
ldmfdsp!, {r0, r1, r2, r3, r4, r5, ip, pc}^
.L3:
.align2
.L2:
.word.LANCHOR0
.sizeirq_, .-irq_
.bss
.align2
.set.LANCHOR0,. + 0
.typecnt, %object
.sizecnt, 4
cnt:
.space4
.identGCC: (Sourcery G++ Lite 2011.03-42) 4.5.2
[Bug target/49437] New: interrupt return pop sometimes corrupts sp
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49437
Summary: interrupt return pop sometimes corrupts sp
Product: gcc
Version: 4.5.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: do...@cba.si
Simple to reproduce, it seems =5 arguments with any of printf* can cause this.
Some code around it was left, as it does not happen otherwise.
$ cat bug.c
#include stdio.h
char *pending_messages_put_start(void);
void pending_messages_put_final(void);
void __attribute__((interrupt)) TIM7_IRQHandler(void)
{
char *msg = pending_messages_put_start();
snprintf(msg, 20, %i %i, 1, 1);
pending_messages_put_final();
}
$ arm-none-eabi-gcc -Wall -Os -S bug.c
$ cat bug.s
.syntax unified
.arch armv7-m
.fpu softvfp
.eabi_attribute 20, 1
.eabi_attribute 21, 1
.eabi_attribute 23, 3
.eabi_attribute 24, 1
.eabi_attribute 25, 1
.eabi_attribute 26, 1
.eabi_attribute 30, 4
.eabi_attribute 18, 4
.thumb
.file bug.c
.text
.align 1
.global TIM7_IRQHandler
.thumb
.thumb_func
.type TIM7_IRQHandler, %function
TIM7_IRQHandler:
@ Stack Align: May be called with mis-aligned SP.
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
mov r0, sp
bic r1, r0, #7
mov sp, r1
push{r0, lr}
sub sp, sp, #8
bl pending_messages_put_start
movsr3, #1
movsr1, #20
ldr r2, .L2
str r3, [sp, #0]
bl snprintf
bl pending_messages_put_final
pop {r0, r2, r3, lr}// -- r3 is in place of r0; expected would
be add sp, sp, #8, pop {r0, lr}, I guess
mov sp, r0
bx lr
.L3:
.align 2
.L2:
.word .LC0
.size TIM7_IRQHandler, .-TIM7_IRQHandler
.section.rodata.str1.1,aMS,%progbits,1
.LC0:
.ascii %i %i\000
.ident GCC: (GNU) 4.5.3
[Bug c/46762] New: gcc crosscompiled for arm optimises away volatile struct member access when -Os
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46762
Summary: gcc crosscompiled for arm optimises away volatile
struct member access when -Os
Product: gcc
Version: 4.5.1
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: do...@cba.si
$ cat bug.c
struct GPIO
{
volatile unsigned int IDR;
} *GPIO = (struct GPIO *)(0x40010808);
volatile unsigned int *GPIO_PTR = (volatile unsigned int *)(0x40010808);
static inline int gpio_get_value_ok()
{
if (*GPIO_PTR 1)
return 1;
return 0;
}
void function_with_no_bug(void)
{
int timeout = 0x100;
while (gpio_get_value_ok() == 0) {
if (timeout-- == 0) {
return;
}
}
}
static inline int gpio_get_value_wrong()
{
if (GPIO-IDR 1)
return 1;
return 0;
}
void function_with_bug(void)
{
int timeout = 0x100;
while (gpio_get_value_wrong() == 0) {
if (timeout-- == 0) {
return;
}
}
}
$ arm-none-eabi-gcc -Wall -Os -c bug.c -o bug.o arm-none-eabi-objdump -xd
bug.o
bug.o: file format elf32-littlearm
bug.o
architecture: arm, flags 0x0011:
HAS_RELOC, HAS_SYMS
start address 0x
private flags = 500: [Version5 EABI]
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 0030 0034 2**2
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
1 .data 0008 0064 2**2
CONTENTS, ALLOC, LOAD, DATA
2 .bss 006c 2**0
ALLOC
3 .comment 002b 006c 2**0
CONTENTS, READONLY
4 .ARM.attributes 0034 0097 2**0
CONTENTS, READONLY
SYMBOL TABLE:
ldf *ABS* bug.c
ld .text .text
ld .data .data
ld .bss .bss
ld .comment .comment
ld .ARM.attributes .ARM.attributes
g F .text 002c function_with_no_bug
002c g F .text 0004 function_with_bug
0004 g O .data 0004 GPIO
g O .data 0004 GPIO_PTR
Disassembly of section .text:
function_with_no_bug:
0: e59f3020ldr r3, [pc, #32] ; 28
function_with_no_bug+0x28
4: e5932000ldr r2, [r3]
8: e3a03401mov r3, #16777216 ; 0x100
c: e5921000ldr r1, [r2]
10: e3110001tst r1, #1
14: 112fff1ebxnelr
14: R_ARM_V4BX *ABS*
18: e353cmp r3, #0
1c: 012fff1ebxeqlr
1c: R_ARM_V4BX *ABS*
20: e2433001sub r3, r3, #1
24: eaf8b c function_with_no_bug+0xc
28: .word 0x
28: R_ARM_ABS32 .data
002c function_with_bug:
2c: e12fff1ebx lr
2c: R_ARM_V4BX *ABS*
$ arm-none-eabi-gcc -v
Using built-in specs.
COLLECT_GCC=arm-none-eabi-gcc
COLLECT_LTO_WRAPPER=/home/domen/toolchains/arm-2010.09/bin/../libexec/gcc/arm-none-eabi/4.5.1/lto-wrapper
Target: arm-none-eabi
Configured with:
/scratch/julian/2010q3-release-eabi-lite/src/gcc-4.5-2010.09/configure
--build=i686-pc-linux-gnu --host=i686-pc-linux-gnu --target=arm-none-eabi
--enable-threads --disable-libmudflap --disable-libssp --disable-libstdcxx-pch
--enable-extra-sgxxlite-multilibs --with-gnu-as --with-gnu-ld
--with-specs='%{save-temps: -fverbose-asm} -D__CS_SOURCERYGXX_MAJ__=2010
-D__CS_SOURCERYGXX_MIN__=9 -D__CS_SOURCERYGXX_REV__=51
%{O2:%{!fno-remove-local-statics: -fremove-local-statics}}
%{O*:%{O|O0|O1|O2|Os:;:%{!fno-remove-local-statics: -fremove-local-statics}}}'
--enable-languages=c,c++ --disable-shared --enable-lto --with-newlib
--with-pkgversion='Sourcery G++ Lite 2010.09-51'
--with-bugurl=https://support.codesourcery.com/GNUToolchain/ --disable-nls
--prefix=/opt/codesourcery --with-headers=yes
--with-sysroot=/opt/codesourcery/arm-none-eabi
--with-build-sysroot=/scratch/julian/2010q3-release-eabi-lite/install/arm-none-eabi
--with-gmp=/scratch/julian/2010q3-release-eabi-lite/obj/host-libs-2010.09-51-arm-none-eabi-i686-pc-linux-gnu/usr
--with-mpfr=/scratch/julian/2010q3-release-eabi-lite/obj/host-libs-2010.09-51-arm-none-eabi-i686-pc-linux-gnu/usr
--with-mpc=/scratch/julian/2010q3-release-eabi-lite/obj/host-libs-2010.09-51-arm-none-eabi-i686-pc-linux-gnu/usr
--with-ppl=/scratch/julian/2010q3-release-eabi-lite/obj/host-libs-2010.09-51-arm-none-eabi-i686-pc-linux-gnu/usr
