------- Additional Comments From hjl at lucon dot org 2006-08-15 21:35 -------
The linker script in question:
.vsyscall_0 -10*1024*1024: AT ((LOADADDR(.data.cacheline_aligned) +
SIZEOF(.data.cacheline_aligned) + 4095) & ~(4095)) { *(.vsyscall_0) }
__vsyscall_0 = LOADADDR(.vsyscall_0);
. = ALIGN(64);
.xtime_lock : AT ((LOADADDR(.vsyscall_0) + SIZEOF(.vsyscall_0) + 63) & ~(63))
{ *(.xtime_lock) }
xtime_lock = LOADADDR(.xtime_lock);
. = ALIGN(16);
.vxtime : AT ((LOADADDR(.xtime_lock) + SIZEOF(.xtime_lock) + 15) & ~(15)) {
*(.vxtime) }
vxtime = LOADADDR(.vxtime);
. = ALIGN(16);
.wall_jiffies : AT ((LOADADDR(.vxtime) + SIZEOF(.vxtime) + 15) & ~(15)) {
*(.wall_jiffies) }
wall_jiffies = LOADADDR(.wall_jiffies);
. = ALIGN(16);
.sys_tz : AT ((LOADADDR(.wall_jiffies) + SIZEOF(.wall_jiffies) + 15) & ~(15))
{ *(.sys_tz) }
sys_tz = LOADADDR(.sys_tz);
. = ALIGN(16);
.sysctl_vsyscall : AT ((LOADADDR(.sys_tz) + SIZEOF(.sys_tz) + 15) & ~(15)) {
*(.sysctl_vsyscall) }
sysctl_vsyscall = LOADADDR(.sysctl_vsyscall);
. = ALIGN(16);
.jiffies : AT ((LOADADDR(.sysctl_vsyscall) + SIZEOF(.sysctl_vsyscall) + 15) &
~(15)) { *(.jiffies) }
jiffies = LOADADDR(.jiffies);
. = ALIGN(16);
.xtime : AT ((LOADADDR(.jiffies) + SIZEOF(.jiffies) + 15) & ~(15)) {
*(.xtime) }
xtime = LOADADDR(.xtime);
.vsyscall_1 ADDR(.vsyscall_0) + 1024: AT (LOADADDR(.vsyscall_0) + 1024) {
*(.vsyscall_1) }
. = LOADADDR(.vsyscall_0) + 4096;
. = ALIGN(8192); /* init_task */
.data.init_task : { *(.data.init_task) }
The resulting sections should be
[14] .data.cacheline_a PROGBITS ffffffff804dd500 4dd500 009600 00 WA
0 0 128
[15] .vsyscall_0 PROGBITS ffffffffff600000 600000 000103 00 AX
0 0 1
[16] .xtime_lock PROGBITS ffffffffff600140 600140 00000c 00 WA
0 0 64
[17] .vxtime PROGBITS ffffffffff600150 600150 000038 00 WA
0 0 16
[18] .wall_jiffies PROGBITS ffffffffff600190 600190 000008 00 WA
0 0 16
[19] .sys_tz PROGBITS ffffffffff6001a0 6001a0 000008 00 WA
0 0 16
[20] .sysctl_vsyscall PROGBITS ffffffffff6001b0 6001b0 000004 00 WA
0 0 16
[21] .jiffies PROGBITS ffffffffff6001c0 6001c0 000008 00 WA
0 0 16
[22] .xtime PROGBITS ffffffffff6001d0 6001d0 000010 00 WA
0 0 16
[23] .vsyscall_1 PROGBITS ffffffffff600400 600400 000028 00 AX
0 0 1
[24] .data.init_task PROGBITS ffffffff804e8000 6e8000 003000 00 WA
0 0 32
This change:
last = r->last_os->output_section_statement.bfd_section;
/* If the current vma overlaps the previous section,
then set the current lma to that at the end of
the previous section. The previous section was
probably an overlay. */
if ((dot >= last->vma
&& dot < last->vma + last->size)
|| (last->vma >= dot
&& last->vma < dot + os->bfd_section->size))
lma = last->lma + last->size;
/* Otherwise, keep the same lma to vma relationship
as the previous section. */
else
lma = dot + last->lma - last->vma;
if (os->section_alignment != -1)
lma = align_power (lma, os->section_alignment);
os->bfd_section->lma = lma;
mishandles it.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=3052
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