https://sourceware.org/bugzilla/show_bug.cgi?id=23854
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-11-04
CC| |hjl.tools at gmail dot com
Ever confirmed|0 |1
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
dpmi.o has:
8f69: 8b 83 00 00 00 00 mov 0x0(%ebx),%eax 8f6b:
R_386_GOT32X DPMI_return_from_realmode
8f6f: 66 05 00 48 add $0x4800,%ax
8f73: 66 2b 83 00 00 00 00 sub 0x0(%ebx),%ax 8f76:
R_386_GOT32X DPMI_dummy_start
8f7a: 66 89 46 30 mov %ax,0x30(%esi)
Only the lower 16 bits of GOT slot are used. It leads to:
[hjl@gnu-cfl-1 pr23854]$ cat pr23854.s
.data
.type bar, @object
bar:
.byte 1
.size bar, .-bar
.globl foo
.type foo, @object
foo:
.byte 1
.size foo, .-foo
.text
.globl _start
.type _start, @function
_start:
adcw bar@GOT(%ecx), %ax
addw bar@GOT(%ecx), %bx
andw bar@GOT(%ecx), %cx
cmpw bar@GOT(%ecx), %dx
orw bar@GOT(%ecx), %di
sbbw bar@GOT(%ecx), %si
subw bar@GOT(%ecx), %bp
xorw bar@GOT(%ecx), %sp
testw %cx, bar@GOT(%ecx)
adcw foo@GOT(%ecx), %ax
addw foo@GOT(%ecx), %bx
andw foo@GOT(%ecx), %cx
cmpw foo@GOT(%ecx), %dx
orw foo@GOT(%ecx), %di
sbbw foo@GOT(%ecx), %si
subw foo@GOT(%ecx), %bp
xorw foo@GOT(%ecx), %sp
testw %cx, foo@GOT(%ecx)
.size _start, .-_start
[hjl@gnu-cfl-1 pr23854]$ make
as --32 -o pr23854.o pr23854.s
ld -melf_i386 -o pr23854 pr23854.o
[hjl@gnu-cfl-1 pr23854]$ objdump -dw pr23854
pr23854: file format elf32-i386
Disassembly of section .text:
08049000 <_start>:
8049000: 66 81 d0 00 a0 adc $0xa000,%ax
8049005: 04 08 add $0x8,%al
8049007: 66 81 c3 00 a0 add $0xa000,%bx
804900c: 04 08 add $0x8,%al
804900e: 66 81 e1 00 a0 and $0xa000,%cx
8049013: 04 08 add $0x8,%al
8049015: 66 81 fa 00 a0 cmp $0xa000,%dx
804901a: 04 08 add $0x8,%al
804901c: 66 81 cf 00 a0 or $0xa000,%di
8049021: 04 08 add $0x8,%al
8049023: 66 81 de 00 a0 sbb $0xa000,%si
8049028: 04 08 add $0x8,%al
804902a: 66 81 ed 00 a0 sub $0xa000,%bp
804902f: 04 08 add $0x8,%al
8049031: 66 81 f4 00 a0 xor $0xa000,%sp
8049036: 04 08 add $0x8,%al
8049038: 66 f7 c1 00 a0 test $0xa000,%cx
804903d: 04 08 add $0x8,%al
804903f: 66 81 d0 01 a0 adc $0xa001,%ax
8049044: 04 08 add $0x8,%al
8049046: 66 81 c3 01 a0 add $0xa001,%bx
804904b: 04 08 add $0x8,%al
804904d: 66 81 e1 01 a0 and $0xa001,%cx
8049052: 04 08 add $0x8,%al
8049054: 66 81 fa 01 a0 cmp $0xa001,%dx
8049059: 04 08 add $0x8,%al
804905b: 66 81 cf 01 a0 or $0xa001,%di
8049060: 04 08 add $0x8,%al
8049062: 66 81 de 01 a0 sbb $0xa001,%si
8049067: 04 08 add $0x8,%al
8049069: 66 81 ed 01 a0 sub $0xa001,%bp
804906e: 04 08 add $0x8,%al
8049070: 66 81 f4 01 a0 xor $0xa001,%sp
8049075: 04 08 add $0x8,%al
8049077: 66 f7 c1 01 a0 test $0xa001,%cx
804907c: 04 08 add $0x8,%al
[hjl@gnu-cfl-1 pr23854]$
Does dpmi.o contain normal i386 code?
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