bootvx: use program header for loading
The section header address is a VMA whereas the address found in
the program header is a physical one. With this change it is
possible to load and start a vx7 intel generic based image.
$ readelf -l /tmp/vx7
Elf file type is EXEC (Executable file)
Entry point 0x408000
There are 2 program headers, starting at offset 52
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x001000 0x00408000 0x00408000 0x04000 0x04000 RWE 0x1000
LOAD 0x005000 0xe040c000 0x0040c000 0x583a84 0x5ccc70 RWE 0x1000
Section to Segment mapping:
Segment Sections...
00 .text.locore .data.locore
01 .text .eh_frame .wrs_build_vars .data .tls_data .tls_vars .bss
$ readelf -S /tmp/vx7
There are 13 section headers, starting at offset 0x588af8:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .text.locore PROGBITS 00408000 001000 00011e 00 AX 0 0 16
[ 2] .data.locore PROGBITS 00409000 002000 003000 00 WA 0 0 4096
[ 3] .text PROGBITS e040c000 005000 4802a0 00 WAX 0 0 32
[ 4] .eh_frame PROGBITS e088c2a0 4852a0 0a1ed0 00 A 0 0 4
[ 5] .wrs_build_vars PROGBITS e092e170 527170 000190 00 Ax 0 0 1
[ 6] .data PROGBITS e092f000 528000 060a70 00 WA 0 0 4096
[ 7] .tls_data PROGBITS e098fa70 588a70 000004 00 A 0 0 4
[ 8] .tls_vars PROGBITS e098fa78 588a78 00000c 00 WA 0 0 4
[ 9] .bss NOBITS e098faa0 588a84 0491d0 00 WA 0 0 32
[10] .shstrtab STRTAB 00000000 588a84 000074 00 0 0 1
[11] .symtab SYMTAB 00000000 588d00 056ee0 10 12 9758 4
[12] .strtab STRTAB 00000000 5dfbe0 05f48a 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
For completeness here are the same information for an old vx5 based image. After
this change it is possible to boot vx5 and vx7 (intel generic) images.
$ readelf -l /tmp/vx5
Elf file type is EXEC (Executable file)
Entry point 0x308000
There are 1 program headers, starting at offset 52
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x000060 0x00308000 0x00308000 0x3513a0 0x757860 RWE 0x20
Section to Segment mapping:
Segment Sections...
00 .text .data .bss
[christian@chgm-pc ~]$ readelf -S /tmp/vx5
There are 12 section headers, starting at offset 0x356580:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .text PROGBITS 00308000 000060 319b10 00 WAX 0 0 32
[ 2] .data PROGBITS 00621b20 319b80 037880 00 WA 0 0 32
[ 3] .bss NOBITS 006593a0 351400 4064c0 00 WA 0 0 16
[ 4] .debug_aranges PROGBITS 00000000 351400 000060 00 0 0 1
[ 5] .debug_pubnames PROGBITS 00000000 351460 00018b 00 0 0 1
[ 6] .debug_info PROGBITS 00000000 3515eb 003429 00 0 0 1
[ 7] .debug_abbrev PROGBITS 00000000 354a14 000454 00 0 0 1
[ 8] .debug_line PROGBITS 00000000 354e68 0016a4 00 0 0 1
[ 9] .shstrtab STRTAB 00000000 35650c 000071 00 0 0 1
[10] .symtab SYMTAB 00000000 356760 0440e0 10 11 8574 4
[11] .strtab STRTAB 00000000 39a840 03e66c 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
1 file changed