So in my quest to build a NEtBSD/i386 5.2_STABLE kernel that would boot
on my Xen-4.5 amd64 servers, I've discovered there seems to be a quite
substantial difference in the object code depending on the build host.
It has been quite a long time since I've worried about code generation
differences due entirely to differences in the build host (1.6 days?),
and especially between different NetBSDs running on the same host
architecture.
Here are three kernels built from the same source tree (with the same
/etc/mk.conf), on three different build-host platforms (bh=build-host)
# size /netbsd-5.2_STABLE-i386-XEN3PAE_DOMU*
text data bss dec hex filename
3507503 65924 470484 4043911 3db487 /netbsd-5.2_STABLE-i386-XEN3PAE_DOMU-bh=amd64-5.2
3510375 65924 470484 4046783 3dbfbf /netbsd-5.2_STABLE-i386-XEN3PAE_DOMU-bh=amd64-7.99
3511175 65924 470484 4047583 3dc2df /netbsd-5.2_STABLE-i386-XEN3PAE_DOMU-bh=i386-4.1
Objdump output appended below is even more weirdly different.
(I also found that 5.2 ${TOOLS_MAKEFS} built on/for i386-4.1 will not
work either.)
Not that these difference matter to Xen -- all fail to boot
I'll try to give each a try on real hardware and virtualbox, but I don't
actually expect any problems with either as similar recent incarnations
of each have been tested in such environments.
--
Greg A. Woods
Planix, Inc.
<woods%planix.com@localhost> +1 250 762-7675 http://www.planix.com/
# objdump -h /netbsd-5.2_STABLE-i386-XEN3PAE_DOMU*
/netbsd-5.2_STABLE-i386-XEN3PAE_DOMU-bh=amd64-5.2: file format elf32-i386
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 002f0d2c c0100000 c0100000 00001000 2**6
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .rodata 0006752b c03f0d40 c03f0d40 002f1d40 2**5
CONTENTS, ALLOC, LOAD, READONLY, DATA
2 link_set_malloc_types 000000e0 c045826c c045826c 0035926c 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
3 link_set_sysctl_funcs 000000f8 c045834c c045834c 0035934c 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 link_set_domains 00000020 c0458444 c0458444 00359444 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
5 link_set_pools 00000068 c0458464 c0458464 00359464 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
6 link_set_modules 00000048 c04584cc c04584cc 003594cc 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
7 link_set_evcnts 0000001c c0458514 c0458514 00359514 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
8 link_set_dkwedge_methods 00000008 c0458530 c0458530 00359530 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
9 link_set_bufq_strats 0000000c c0458538 c0458538 00359538 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
10 .data 00010184 c0459580 c0459580 00359580 2**6
CONTENTS, ALLOC, LOAD, DATA
11 .bss 00072dd4 c046a000 c046a000 00369704 2**12
ALLOC
12 .note.netbsd.ident 00000018 c04dcdd4 c04dcdd4 00369704 2**2
CONTENTS, READONLY
13 .ident 0000ae92 00000000 00000000 0036971c 2**0
CONTENTS, READONLY
14 __xen_guest 000000c3 00000000 00000000 003745ae 2**0
CONTENTS, READONLY
15 .comment 0000b46e 00000000 00000000 00374671 2**0
CONTENTS, READONLY
16 .debug_abbrev 00000255 00000000 00000000 0037fadf 2**0
CONTENTS, READONLY, DEBUGGING
17 .debug_info 00005fe3 00000000 00000000 0037fd34 2**0
CONTENTS, READONLY, DEBUGGING
18 .debug_line 000004ec 00000000 00000000 00385d17 2**0
CONTENTS, READONLY, DEBUGGING
19 .debug_frame 0000002c 00000000 00000000 00386204 2**2
CONTENTS, READONLY, DEBUGGING
20 .debug_loc 0000002c 00000000 00000000 00386230 2**0
CONTENTS, READONLY, DEBUGGING
21 .debug_pubnames 0000006a 00000000 00000000 0038625c 2**0
CONTENTS, READONLY, DEBUGGING
22 .debug_aranges 00000020 00000000 00000000 003862c6 2**0
CONTENTS, READONLY, DEBUGGING
23 .debug_str 000032be 00000000 00000000 003862e6 2**0
CONTENTS, READONLY, DEBUGGING
/netbsd-5.2_STABLE-i386-XEN3PAE_DOMU-bh=amd64-7.99: file format elf32-i386
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 002f0d2c c0100000 c0100000 00001000 2**6
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .rodata 00068063 c03f0d40 c03f0d40 002f1d40 2**5
CONTENTS, ALLOC, LOAD, READONLY, DATA
2 link_set_malloc_types 000000e0 c0458da4 c0458da4 00359da4 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
3 link_set_sysctl_funcs 000000f8 c0458e84 c0458e84 00359e84 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 link_set_domains 00000020 c0458f7c c0458f7c 00359f7c 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
5 link_set_pools 00000068 c0458f9c c0458f9c 00359f9c 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
6 link_set_modules 00000048 c0459004 c0459004 0035a004 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
7 link_set_evcnts 0000001c c045904c c045904c 0035a04c 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
8 link_set_dkwedge_methods 00000008 c0459068 c0459068 0035a068 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
9 link_set_bufq_strats 0000000c c0459070 c0459070 0035a070 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
10 .data 00010184 c045a080 c045a080 0035a080 2**6
CONTENTS, ALLOC, LOAD, DATA
11 .bss 00072dd4 c046b000 c046b000 0036a204 2**12
ALLOC
12 .note.netbsd.ident 00000018 c04dddd4 c04dddd4 0036a204 2**2
CONTENTS, READONLY
13 .ident 0000ae92 00000000 00000000 0036a21c 2**0
CONTENTS, READONLY
14 __xen_guest 000000c3 00000000 00000000 003750ae 2**0
CONTENTS, READONLY
15 .comment 0000b46e 00000000 00000000 00375171 2**0
CONTENTS, READONLY
16 .debug_abbrev 00000255 00000000 00000000 003805df 2**0
CONTENTS, READONLY, DEBUGGING
17 .debug_info 00005fe3 00000000 00000000 00380834 2**0
CONTENTS, READONLY, DEBUGGING
18 .debug_line 00000517 00000000 00000000 00386817 2**0
CONTENTS, READONLY, DEBUGGING
19 .debug_frame 0000002c 00000000 00000000 00386d30 2**2
CONTENTS, READONLY, DEBUGGING
20 .debug_loc 0000002c 00000000 00000000 00386d5c 2**0
CONTENTS, READONLY, DEBUGGING
21 .debug_pubnames 0000006a 00000000 00000000 00386d88 2**0
CONTENTS, READONLY, DEBUGGING
22 .debug_aranges 00000020 00000000 00000000 00386df2 2**0
CONTENTS, READONLY, DEBUGGING
23 .debug_str 000032ce 00000000 00000000 00386e12 2**0
CONTENTS, READONLY, DEBUGGING
/netbsd-5.2_STABLE-i386-XEN3PAE_DOMU-bh=i386-4.1: file format elf32-i386
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 002f104c c0100000 c0100000 00001000 2**6
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .rodata 00068063 c03f1060 c03f1060 002f2060 2**5
CONTENTS, ALLOC, LOAD, READONLY, DATA
2 link_set_malloc_types 000000e0 c04590c4 c04590c4 0035a0c4 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
3 link_set_sysctl_funcs 000000f8 c04591a4 c04591a4 0035a1a4 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 link_set_domains 00000020 c045929c c045929c 0035a29c 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
5 link_set_pools 00000068 c04592bc c04592bc 0035a2bc 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
6 link_set_modules 00000048 c0459324 c0459324 0035a324 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
7 link_set_evcnts 0000001c c045936c c045936c 0035a36c 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
8 link_set_dkwedge_methods 00000008 c0459388 c0459388 0035a388 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
9 link_set_bufq_strats 0000000c c0459390 c0459390 0035a390 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
10 .data 00010184 c045a3c0 c045a3c0 0035a3c0 2**6
CONTENTS, ALLOC, LOAD, DATA
11 .bss 00072dd4 c046b000 c046b000 0036a544 2**12
ALLOC
12 .note.netbsd.ident 00000018 c04dddd4 c04dddd4 0036a544 2**2
CONTENTS, READONLY
13 .ident 0000ae92 00000000 00000000 0036a55c 2**0
CONTENTS, READONLY
14 __xen_guest 000000c3 00000000 00000000 003753ee 2**0
CONTENTS, READONLY
15 .comment 0000b46e 00000000 00000000 003754b1 2**0
CONTENTS, READONLY
16 .debug_abbrev 00000255 00000000 00000000 0038091f 2**0
CONTENTS, READONLY, DEBUGGING
17 .debug_info 00005fe3 00000000 00000000 00380b74 2**0
CONTENTS, READONLY, DEBUGGING
18 .debug_line 00000519 00000000 00000000 00386b57 2**0
CONTENTS, READONLY, DEBUGGING
19 .debug_frame 0000002c 00000000 00000000 00387070 2**2
CONTENTS, READONLY, DEBUGGING
20 .debug_loc 0000002c 00000000 00000000 0038709c 2**0
CONTENTS, READONLY, DEBUGGING
21 .debug_pubnames 0000006a 00000000 00000000 003870c8 2**0
CONTENTS, READONLY, DEBUGGING
22 .debug_aranges 00000020 00000000 00000000 00387132 2**0
CONTENTS, READONLY, DEBUGGING
23 .debug_str 000032d0 00000000 00000000 00387152 2**0
CONTENTS, READONLY, DEBUGGING
Attachment:
pgptouJf_vzAK.pgp
Description: PGP signature