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I have now verified and am able to reproduce a pretty weird problem:
Unmodified egcs-1.1.2 when bootstrapped on i586-pc-linux against
glibc-2.1.1 miscompiles the ncr53c8xx driver in Linux-2.0.37, or at
least it compiles it in such a way that it doesn't work (kernel hangs
on boot when detecting SCSI devices).
Unmodified egcs-1.1.2 when bootstrapped on i586-pc-linux against
glibc-2.0.6 seems to compile Linux-2.0.37 just fine, at least
ncr53c8xx works.
Both of these compilers are _run_ with the same glibc-2.1.1 libc.so,
which suggests that the different include files (eg. 2.1.1 has inline
string functions) may be the cause for the differing behaviour. Since
the Linux kernel uses nothing from libc, it may be that egcs-1.1.2 is
miscompiled when using the glibc-2.1.1 headers.
This is on a single system (with the same kernel configuration, of
course), I only need to change a couple of symlinks to flip between
glibc-2.0.6 and glibc-2.1.1.
What can I do now to track this down ?
Appended is the only noticable difference between the assembler
generated for ncr53c8xx.c from both of these egcs-1.1.2 compilers.
(/usr/src/linux-egcs-1.1.2/drivers/scsi/ncr53c8xx.s is the
`correct'/working version).
Regards,
Wolfram.
--- /usr/src/linux-egcs-1.1.2/drivers/scsi/ncr53c8xx.s Tue Jun 22 23:57:44 1999
+++ ncr53c8xx.s Sun Jun 27 23:35:49 1999
@@ -4107,71 +4107,86 @@
.align 4
.type ncr_wakeup_done,@function
ncr_wakeup_done:
- subl $4,%esp
+ subl $12,%esp
pushl %ebp
pushl %edi
pushl %esi
pushl %ebx
- movl 24(%esp),%edi
- leal 2464(%edi),%ebp
- movl 2560(%edi),%ecx
- movl %ecx,16(%esp)
+ movl 32(%esp),%ebx
+ movl 32(%esp),%edi
+ addl $2464,%edi
+ movl 2560(%ebx),%ebx
+ movl %ebx,16(%esp)
+ movl %edi,24(%esp)
.p2align 2
.L1411:
- movl 16(%esp),%esi
- incl %esi
- cmpl $23,%esi
+ movl 16(%esp),%ebp
+ incl %ebp
+ cmpl $23,%ebp
jle .L1412
- xorl %esi,%esi
+ xorl %ebp,%ebp
.L1412:
- leal 0(,%esi,4),%eax
- movl (%eax,%ebp),%ebx
- cmpl $-1,%ebx
+ leal 0(,%ebp,4),%ebx
+ movl 24(%esp),%edi
+ movl %ebx,20(%esp)
+ movl (%ebx,%edi),%esi
+ movl %esi,%eax
+ xorl %edx,%edx
+ andl $0,%eax
+ andl $-1,%edx
+ movl %eax,%ecx
+ orl %edx,%ecx
je .L1410
- movl $-1,(%eax,%ebp)
- leal 4(%esi,%eax),%edx
- movl 2256(%edi),%eax
+ cmpl $-1,%esi
+ je .L1410
+ movl $-1,(%ebx,%edi)
+ leal 4(%ebp,%ebx),%edx
+ movl 32(%esp),%ebx
+ movl 2256(%ebx),%eax
addl $1832,%eax
- movl 2260(%edi),%ecx
- addl $708,%ecx
- movl %ecx,(%eax,%edx,4)
+ movl 2260(%ebx),%edi
+ addl $708,%edi
+ movl %edi,(%eax,%edx,4)
#APP
#NO_APP
- movl 16(%esp),%ecx
- leal 4(%ecx,%ecx,4),%edx
+ movl 16(%esp),%ebx
+ movl 32(%esp),%edi
+ leal 4(%ebx,%ebx,4),%edx
movl 2256(%edi),%eax
addl $1832,%eax
- movl 2260(%edi),%ecx
- addl $716,%ecx
- movl %ecx,(%eax,%edx,4)
- movb 29(%ebx),%al
+ movl 2260(%edi),%ebx
+ addl $716,%ebx
+ movl %ebx,(%eax,%edx,4)
+ movb 29(%esi),%al
testb %al,%al
- jge .L1414
- pushl %ebx
+ jge .L1415
+ pushl %esi
pushl %edi
call ncr_complete
- jmp .L1418
+ jmp .L1419
.p2align 2
-.L1414:
+.L1415:
testb $32,%al
- je .L1415
- pushl %ebx
+ je .L1416
+ pushl %esi
+ movl 36(%esp),%edi
pushl %edi
call ncr_ccb_skipped
-.L1418:
+.L1419:
addl $8,%esp
-.L1415:
- movl %esi,16(%esp)
+.L1416:
+ movl %ebp,16(%esp)
jmp .L1411
.p2align 2
.L1410:
- movl 16(%esp),%ecx
- movl %ecx,2560(%edi)
+ movl 32(%esp),%edi
+ movl 16(%esp),%ebx
+ movl %ebx,2560(%edi)
popl %ebx
popl %esi
popl %edi
popl %ebp
- popl %ecx
+ addl $12,%esp
ret
--
`Surf the sea, not double-u three...'
wmglo@dent.med.uni-muenchen.de
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