On Fri, Nov 15, 2019 at 01:16:55AM +0000, Stuart Henderson wrote:
> I think if you run "disassemble" from gdb (or pkg_add gdb and run "egdb"
> in case the old gdb in base doesn't understand the opcodes) you may find
> which instruction it's complaining about.
>
> This runs OK on an i386 with more CPU features; most likely it wants
> SSE or similar which the Geode LX in your net5501 doesn't have. (Go has
> runtime cpuid checks for most of the SSE variants but I think not for
> the original SSE which it probably just assumes is available).
> One clue would be if the disassembly has instructions referencing
> registers X0..X15 which are just used for SSE.
>
> > cpu0 at mainbus0: (uniprocessor)
> > cpu0: Geode(TM) Integrated Processor by AMD PCS ("AuthenticAMD" 586-class)
> > 500 MHz, 05-0a-02
> > cpu0: FPU,DE,PSE,TSC,MSR,CX8,SEP,PGE,CMOV,CFLUSH,MMX,MMXX,3DNOW2,3DNOW
egdb seems to work a little better:
(gdb) run
Starting program: /usr/local/bin/go
Program received signal SIGILL, Illegal instruction.
runtime.check () at /usr/local/go/src/runtime/runtime1.go:146
146 i, i1 float32
(gdb) bt
#0 runtime.check () at /usr/local/go/src/runtime/runtime1.go:146
#1 0x0809794e in runtime.rt0_go () at /usr/local/go/src/runtime/asm_387.s:238
#2 0x0896c360 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
It has been a *long* time since I've looked at assembly - I *think* this
is failing on xorps, which is an SSE instruction?
(gdb) disassemble
Dump of assembler code for function runtime.check:
0x0807f9f0 <+0>: mov %gs:0xfffffffc,%ecx
0x0807f9f7 <+7>: cmp 0x8(%ecx),%esp
0x0807f9fa <+10>: jbe 0x807fd6b <runtime.check+891>
0x0807fa00 <+16>: sub $0x2c,%esp
0x0807fa03 <+19>: movl $0x0,0x20(%esp)
=> 0x0807fa0b <+27>: xorps %xmm0,%xmm0
0x0807fa0e <+30>: movss %xmm0,0x1c(%esp)
0x0807fa14 <+36>: xorps %xmm0,%xmm0
0x0807fa17 <+39>: movsd %xmm0,0x24(%esp)
0x0807fa1d <+45>: movl $0x0,0x18(%esp)
0x0807fa25 <+53>: movl $0x4b57ce31,(%esp)
0x0807fa2c <+60>: movl $0xb3a,0x4(%esp)
0x0807fa34 <+68>: movl $0x3b9aca00,0x8(%esp)
0x0807fa3c <+76>: lea 0x20(%esp),%eax
0x0807fa40 <+80>: mov %eax,0xc(%esp)
0x0807fa44 <+84>: call 0x80801b0 <runtime.timediv>
0x0807fa49 <+89>: cmpl $0x3039,0x10(%esp)
0x0807fa51 <+97>: jne 0x807fd54 <runtime.check+868>
0x0807fa57 <+103>: cmpl $0xd431,0x20(%esp)
0x0807fa5f <+111>: jne 0x807fd54 <runtime.check+868>
0x0807fa65 <+117>: movl $0x0,0x14(%esp)
0x0807fa6d <+125>: movl $0x1,0x14(%esp)
0x0807fa75 <+133>: lea 0x14(%esp),%eax
0x0807fa79 <+137>: mov %eax,(%esp)
0x0807fa7c <+140>: movl $0x1,0x4(%esp)
0x0807fa84 <+148>: movl $0x2,0x8(%esp)
0x0807fa8c <+156>: call 0x804a660 <runtime/internal/atomic.Cas>
0x0807fa91 <+161>: movzbl 0xc(%esp),%eax
0x0807fa96 <+166>: test %al,%al
0x0807fa98 <+168>: je 0x807fd3e <runtime.check+846>
0x0807fa9e <+174>: cmpl $0x2,0x14(%esp)
0x0807faa3 <+179>: jne 0x807fd28 <runtime.check+824>
0x0807faa9 <+185>: movl $0x4,0x14(%esp)
0x0807fab1 <+193>: lea 0x14(%esp),%eax
0x0807fab5 <+197>: mov %eax,(%esp)
0x0807fab8 <+200>: movl $0x5,0x4(%esp)
0x0807fac0 <+208>: movl $0x6,0x8(%esp)
0x0807fac8 <+216>: call 0x804a660 <runtime/internal/atomic.Cas>
0x0807facd <+221>: movzbl 0xc(%esp),%eax
0x0807fad2 <+226>: test %al,%al
0x0807fad4 <+228>: jne 0x807fd12 <runtime.check+802>
0x0807fada <+234>: cmpl $0x4,0x14(%esp)
0x0807fadf <+239>: jne 0x807fcfc <runtime.check+780>
0x0807fae5 <+245>: movl $0xffffffff,0x14(%esp)
0x0807faed <+253>: lea 0x14(%esp),%eax
0x0807faf1 <+257>: mov %eax,(%esp)
0x0807faf4 <+260>: movl $0xffffffff,0x4(%esp)
0x0807fafc <+268>: movl $0xfffffffe,0x8(%esp)
0x0807fb04 <+276>: call 0x804a660 <runtime/internal/atomic.Cas>
0x0807fb09 <+281>: movzbl 0xc(%esp),%eax
0x0807fb0e <+286>: test %al,%al
0x0807fb10 <+288>: je 0x807fce6 <runtime.check+758>
0x0807fb16 <+294>: cmpl $0xfffffffe,0x14(%esp)
0x0807fb1b <+299>: jne 0x807fcd0 <runtime.check+736>
0x0807fb21 <+305>: movl $0x0,0x18(%esp)
0x0807fb29 <+313>: movl $0x1010101,0x18(%esp)
0x0807fb31 <+321>: lea 0x19(%esp),%eax
0x0807fb35 <+325>: mov %eax,(%esp)
0x0807fb38 <+328>: movb $0xf0,0x4(%esp)
0x0807fb3d <+333>: call 0x804a880 <runtime/internal/atomic.Or8>
0x0807fb42 <+338>: cmpb $0x1,0x18(%esp)
0x0807fb47 <+343>: jne 0x807fcba <runtime.check+714>
0x0807fb4d <+349>: cmpb $0xf1,0x19(%esp)
0x0807fb52 <+354>: jne 0x807fcba <runtime.check+714>
0x0807fb58 <+360>: cmpb $0x1,0x1a(%esp)
0x0807fb5d <+365>: jne 0x807fcba <runtime.check+714>
0x0807fb63 <+371>: cmpb $0x1,0x1b(%esp)
0x0807fb68 <+376>: jne 0x807fcba <runtime.check+714>
0x0807fb6e <+382>: movl $0x0,0x18(%esp)
0x0807fb76 <+390>: movl $0xffffffff,0x18(%esp)
0x0807fb7e <+398>: lea 0x19(%esp),%eax
0x0807fb82 <+402>: mov %eax,(%esp)
0x0807fb85 <+405>: movb $0x1,0x4(%esp)
0x0807fb8a <+410>: call 0x804a890 <runtime/internal/atomic.And8>
0x0807fb8f <+415>: cmpb $0xff,0x18(%esp)
0x0807fb94 <+420>: jne 0x807fca4 <runtime.check+692>
0x0807fb9a <+426>: cmpb $0x1,0x19(%esp)
0x0807fb9f <+431>: jne 0x807fca4 <runtime.check+692>
0x0807fba5 <+437>: cmpb $0xff,0x1a(%esp)
0x0807fbaa <+442>: jne 0x807fca4 <runtime.check+692>
0x0807fbb0 <+448>: cmpb $0xff,0x1b(%esp)
0x0807fbb5 <+453>: jne 0x807fca4 <runtime.check+692>
0x0807fbbb <+459>: movl $0xffffffff,0x24(%esp)
0x0807fbc3 <+467>: movl $0xffffffff,0x28(%esp)
0x0807fbcb <+475>: movsd 0x24(%esp),%xmm0
0x0807fbd1 <+481>: movsd 0x8645a18,%xmm1
0x0807fbd9 <+489>: ucomisd %xmm1,%xmm0
0x0807fbdd <+493>: jne 0x807fbe5 <runtime.check+501>
0x0807fbdf <+495>: jnp 0x807fc8e <runtime.check+670>
0x0807fbe5 <+501>: jne 0x807fbed <runtime.check+509>
0x0807fbe7 <+503>: jnp 0x807fc78 <runtime.check+648>
0x0807fbed <+509>: movl $0xffffffff,0x1c(%esp)
0x0807fbf5 <+517>: movss 0x1c(%esp),%xmm0
0x0807fbfb <+523>: movss 0x8645628,%xmm1
0x0807fc03 <+531>: ucomiss %xmm0,%xmm1
0x0807fc06 <+534>: jne 0x807fc0a <runtime.check+538>
0x0807fc08 <+536>: jnp 0x807fc62 <runtime.check+626>
0x0807fc0a <+538>: call 0x807f6a0 <runtime.testAtomic64>
0x0807fc0f <+543>: movl $0x800,(%esp)
0x0807fc16 <+550>: call 0x80878c0 <runtime.round2>
0x0807fc1b <+555>: cmpl $0x800,0x4(%esp)
0x0807fc23 <+563>: jne 0x807fc4c <runtime.check+604>
0x0807fc25 <+565>: call 0x8099260 <runtime.checkASM>
0x0807fc2a <+570>: movzbl (%esp),%eax
0x0807fc2e <+574>: test %al,%al
0x0807fc30 <+576>: je 0x807fc36 <runtime.check+582>
0x0807fc32 <+578>: add $0x2c,%esp
0x0807fc35 <+581>: ret
0x0807fc36 <+582>: lea 0x8571904,%eax
0x0807fc3c <+588>: mov %eax,(%esp)
0x0807fc3f <+591>: movl $0x16,0x4(%esp)
0x0807fc47 <+599>: call 0x8072260 <runtime.throw>
0x0807fc4c <+604>: lea 0x8575ba6,%eax
0x0807fc52 <+610>: mov %eax,(%esp)
0x0807fc55 <+613>: movl $0x1c,0x4(%esp)
0x0807fc5d <+621>: call 0x8072260 <runtime.throw>
0x0807fc62 <+626>: lea 0x856a764,%eax
0x0807fc68 <+632>: mov %eax,(%esp)
0x0807fc6b <+635>: movl $0xb,0x4(%esp)
0x0807fc73 <+643>: call 0x8072260 <runtime.throw>
0x0807fc78 <+648>: lea 0x856a77a,%eax
0x0807fc7e <+654>: mov %eax,(%esp)
0x0807fc81 <+657>: movl $0xb,0x4(%esp)
0x0807fc89 <+665>: call 0x8072260 <runtime.throw>
0x0807fc8e <+670>: lea 0x856a76f,%eax
0x0807fc94 <+676>: mov %eax,(%esp)
0x0807fc97 <+679>: movl $0xb,0x4(%esp)
0x0807fc9f <+687>: call 0x8072260 <runtime.throw>
0x0807fca4 <+692>: lea 0x8569c24,%eax
0x0807fcaa <+698>: mov %eax,(%esp)
0x0807fcad <+701>: movl $0xa,0x4(%esp)
0x0807fcb5 <+709>: call 0x8072260 <runtime.throw>
0x0807fcba <+714>: lea 0x85690f5,%eax
0x0807fcc0 <+720>: mov %eax,(%esp)
0x0807fcc3 <+723>: movl $0x9,0x4(%esp)
0x0807fccb <+731>: call 0x8072260 <runtime.throw>
0x0807fcd0 <+736>: lea 0x8566551,%eax
0x0807fcd6 <+742>: mov %eax,(%esp)
0x0807fcd9 <+745>: movl $0x4,0x4(%esp)
0x0807fce1 <+753>: call 0x8072260 <runtime.throw>
0x0807fce6 <+758>: lea 0x856654d,%eax
0x0807fcec <+764>: mov %eax,(%esp)
0x0807fcef <+767>: movl $0x4,0x4(%esp)
0x0807fcf7 <+775>: call 0x8072260 <runtime.throw>
0x0807fcfc <+780>: lea 0x8566549,%eax
0x0807fd02 <+786>: mov %eax,(%esp)
0x0807fd05 <+789>: movl $0x4,0x4(%esp)
0x0807fd0d <+797>: call 0x8072260 <runtime.throw>
0x0807fd12 <+802>: lea 0x8566545,%eax
0x0807fd18 <+808>: mov %eax,(%esp)
0x0807fd1b <+811>: movl $0x4,0x4(%esp)
0x0807fd23 <+819>: call 0x8072260 <runtime.throw>
0x0807fd28 <+824>: lea 0x8566541,%eax
0x0807fd2e <+830>: mov %eax,(%esp)
0x0807fd31 <+833>: movl $0x4,0x4(%esp)
0x0807fd39 <+841>: call 0x8072260 <runtime.throw>
0x0807fd3e <+846>: lea 0x856653d,%eax
0x0807fd44 <+852>: mov %eax,(%esp)
0x0807fd47 <+855>: movl $0x4,0x4(%esp)
0x0807fd4f <+863>: call 0x8072260 <runtime.throw>
0x0807fd54 <+868>: lea 0x856a651,%eax
0x0807fd5a <+874>: mov %eax,(%esp)
0x0807fd5d <+877>: movl $0xb,0x4(%esp)
0x0807fd65 <+885>: call 0x8072260 <runtime.throw>
0x0807fd6a <+890>: nop
0x0807fd6b <+891>: call 0x8097b40 <runtime.morestack_noctxt>
0x0807fd70 <+896>: jmp 0x807f9f0 <runtime.check>
End of assembler dump.
Thanks for helping out with this!
