https://sourceware.org/bugzilla/show_bug.cgi?id=18108
Bug ID: 18108
Summary: possible coldfire gas bug on frame pointer
Product: binutils
Version: 2.24
Status: NEW
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: angelo70 at gmail dot com
I am compiling the same C code from a 32bit host m68k toolchain based on
binutils 2.21 and another, with a 64bit host toolchain based on binutils 2.24.
Taget is mcf5307. The code produced from 2,24 hangs on the target.
The code hanges exactly on a 64bit shift operatiion (see "test = size >> d;").
On this C fuction:
void print_size(uint64_t size, const char *s)
{
unsigned long m = 0, n;
uint64_t f;
static const char names[] = {'E', 'P', 'T', 'G', 'M', 'K'};
unsigned long d = 10 * ARRAY_SIZE(names);
char c = 0;
unsigned int i;
volatile uint64_t test;
printf("print_size(): entering\r\n");
for (i = 0; i < ARRAY_SIZE(names); i++, d -= 10) {
asm volatile("nop");
test = size >> d;
asm volatile("nop");
if (test) {
c = names[i];
break;
}
}
.....
toolchain based on binutils 2.21 produce this mcf5307 working binary (see code
between 2 nop):
ffc0f19c <print_size>:
ffc0f19c: 4e56 ffc0 linkw %fp,#-64
ffc0f1a0: 206d 0008 moveal %a5@(8),%a0
ffc0f1a4: 48d7 3c7c moveml %d2-%d6/%a2-%a5,%sp@
ffc0f1a8: 242e 0008 movel %fp@(8),%d2
ffc0f1ac: 262e 000c movel %fp@(12),%d3
ffc0f1b0: 2f2d 03cc movel %a5@(972),%sp@-
ffc0f1b4: 347c 003c moveaw #60,%a2
ffc0f1b8: 2d42 fff0 movel %d2,%fp@(-16)
ffc0f1bc: 2d43 fff4 movel %d3,%fp@(-12)
ffc0f1c0: 262e 0010 movel %fp@(16),%d3
ffc0f1c4: 4282 clrl %d2
ffc0f1c6: 2d43 ffec movel %d3,%fp@(-20)
ffc0f1ca: 4e90 jsr %a0@
ffc0f1cc: 588f addql #4,%sp
ffc0f1ce: 266d 0514 moveal %a5@(1300),%a3
ffc0f1d2: 4e71 nop
ffc0f1d4: 2f0a movel %a2,%sp@-
ffc0f1d6: 2f2e fff4 movel %fp@(-12),%sp@-
ffc0f1da: 2f2e fff0 movel %fp@(-16),%sp@-
ffc0f1de: 4e93 jsr %a3@
ffc0f1e0: 2040 moveal %d0,%a0
ffc0f1e2: 2241 moveal %d1,%a1
ffc0f1e4: 4fef 000c lea %sp@(12),%sp
ffc0f1e8: 2d48 fff8 movel %a0,%fp@(-8)
ffc0f1ec: 2d49 fffc movel %a1,%fp@(-4)
ffc0f1f0: 4e71 nop
ffc0f1f2: 202e fff8 movel %fp@(-8),%d0
ffc0f1f6: 222e fffc movel %fp@(-4),%d1
ffc0f1fa: 2800 movel %d0,%d4
ffc0f1fc: 8881 orl %d1,%d4
..........
Binutils 2.24 (on 64bit machine) produce binary that hangs on mcf5307 between
the 2 nop:
ffc0ee2e <print_size>:
ffc0ee2e: 4e56 ffd0 linkw %fp,#-48
ffc0ee32: 48d7 3c7c moveml %d2-%d6/%a2-%a5,%sp@
ffc0ee36: 2f2d 03d8 movel %a5@(984),%sp@-
ffc0ee3a: 4282 clrl %d2
ffc0ee3c: 347c 003c moveaw #60,%a2
ffc0ee40: 266d 0008 moveal %a5@(8),%a3
ffc0ee44: 4e93 jsr %a3@
ffc0ee46: 588f addql #4,%sp
ffc0ee48: 262d 051c movel %a5@(1308),%d3
ffc0ee4c: 4e71 nop
ffc0ee4e: 2043 moveal %d3,%a0
ffc0ee50: 2f0a movel %a2,%sp@-
ffc0ee52: 2f2e 000c movel %fp@(12),%sp@-
ffc0ee56: 2f2e 0008 movel %fp@(8),%sp@-
ffc0ee5a: 4e90 jsr %a0@
ffc0ee5c: 4fef 000c lea %sp@(12),%sp
ffc0ee60: 2d40 fff8 movel %d0,%fp@(-8)
ffc0ee64: 2d41 fffc movel %d1,%fp@(-4)
ffc0ee68: 4e71 nop
ffc0ee6a: 2843 moveal %d3,%a4
ffc0ee6c: 202e fff8 movel %fp@(-8),%d0
ffc0ee70: 222e fffc movel %fp@(-4),%d1
ffc0ee74: 2800 movel %d0,%d4
ffc0ee76: 8881 orl %d1,%d4
ffc0ee78: 670a beqs ffc0ee84 <print_size+0x56>
ffc0ee7a: 206d 03d0 moveal %a5@(976),%a0
ffc0ee7e: 1430 2800 moveb %a0@(0000000000000000,%d2:l),%d2
....
Seems strange to me the code @ ffc0ee52 and ffc0ee56, becouse of the positive
%fp offset.
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