From: Pavel Roskin <proski@gnu.org>
To: The development of GRUB 2 <grub-devel@gnu.org>
Subject: Re: [PATCH] access gdtdesc on segment 0 unconditionally (Re: [PATCH] i386-qemu port)
Date: Mon, 22 Jun 2009 17:44:43 -0400 [thread overview]
Message-ID: <1245707083.5069.2.camel@mj> (raw)
In-Reply-To: <20090622213232.GB10027@thorin>
On Mon, 2009-06-22 at 23:32 +0200, Robert Millan wrote:
> On Mon, Jun 22, 2009 at 10:52:13PM +0200, Robert Millan wrote:
> > I don't think it's possible to use relative addresses
> > with this particular instruction.
>
> Uhm sorry, this was silly. Of course you can use addresses relative to a
> segment in lgdt, but this doesn't change the fact that GAS always gives
> you absolute ones.
>
> Also, I'm not sure if it's possible to use a 16-bit field in this instruction,
> it could be that the field is always 32-bit, even if it's relative to a
> segment. This dump is from the i386-pc kernel.img:
>
> 836f: 2e 67 66 0f 01 15 68 addr32 lgdtl %cs:0x8368
> 8376: 83 00 00
>
> a little-endian 0x00008368 is seen here, indicating the field is 32-bit.
But if I omit ADDR32, I get:
0000016e <real_to_prot>:
16e: fa cli
16f: 2e 66 0f 01 16 68 01 lgdtl %cs:0x168
176: 0f 20 c0 mov %cr0,%eax
The address is 16-bit.
--
Regards,
Pavel Roskin
next prev parent reply other threads:[~2009-06-22 21:44 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-21 18:17 [PATCH] i386-qemu port Robert Millan
2009-06-21 18:50 ` does module area require alignment? (Re: [PATCH] i386-qemu port) Robert Millan
2009-06-21 19:08 ` Pavel Roskin
2009-06-21 19:33 ` Robert Millan
2009-06-22 12:31 ` [PATCH] define GRUB_MOD_ALIGN to 0 on non-ieee1275 (Re: does module area require alignment? (Re: [PATCH] i386-qemu port)) Robert Millan
2009-06-22 19:43 ` Pavel Roskin
2009-06-22 20:41 ` Robert Millan
2009-06-22 20:51 ` Pavel Roskin
2009-06-22 21:22 ` Robert Millan
2009-06-22 21:45 ` Pavel Roskin
2009-06-22 22:31 ` Robert Millan
2009-06-22 19:51 ` does module area require alignment? (Re: [PATCH] i386-qemu port) Pavel Roskin
2009-06-22 22:50 ` Vladimir 'phcoder' Serbinenko
2009-06-23 0:10 ` Pavel Roskin
2009-06-21 18:54 ` [PATCH] move grub_stop() " Robert Millan
2009-06-21 19:05 ` Pavel Roskin
2009-06-21 19:25 ` Robert Millan
2009-06-22 2:14 ` Pavel Roskin
2009-06-22 10:10 ` Robert Millan
2009-06-22 16:16 ` Pavel Roskin
2009-06-22 18:05 ` Robert Millan
2009-06-21 19:00 ` [PATCH] i386-qemu port Pavel Roskin
2009-06-21 19:30 ` Robert Millan
2009-06-22 12:45 ` Robert Millan
2009-06-21 20:34 ` Robert Millan
2009-06-21 20:40 ` Vladimir 'phcoder' Serbinenko
2009-06-21 19:19 ` [PATCH] rename kernel.elf to kernel.img (Re: [PATCH] i386-qemu port) Robert Millan
2009-06-22 2:20 ` Pavel Roskin
2009-06-22 10:27 ` Robert Millan
2009-06-21 19:52 ` [PATCH] swap real_to_prot() and prot_to_real() " Robert Millan
2009-06-22 1:56 ` Pavel Roskin
2009-06-22 10:45 ` Robert Millan
2009-06-21 20:22 ` [PATCH] i386-qemu port Robert Millan
2009-06-22 1:50 ` Pavel Roskin
2009-06-22 10:57 ` Robert Millan
2009-06-21 22:53 ` [PATCH] access gdtdesc on segment 0 unconditionally (Re: [PATCH] i386-qemu port) Robert Millan
2009-06-22 1:22 ` Pavel Roskin
2009-06-22 9:52 ` Robert Millan
2009-06-22 19:39 ` Pavel Roskin
2009-06-22 20:52 ` Robert Millan
2009-06-22 21:32 ` Robert Millan
2009-06-22 21:44 ` Pavel Roskin [this message]
2009-06-22 22:43 ` Robert Millan
2009-06-23 0:53 ` Pavel Roskin
2009-06-23 11:02 ` Robert Millan
2009-06-22 21:36 ` Pavel Roskin
2009-06-22 22:52 ` Robert Millan
2009-06-22 10:26 ` about Apple compiler (Re: [PATCH] access gdtdesc on segment 0 unconditionally (Re: [PATCH] i386-qemu port)) Robert Millan
2009-06-22 16:10 ` Pavel Roskin
2009-06-22 15:02 ` [PATCH] s/GRUB_MEMORY_MACHINE_LINK_ADDR/GRUB_KERNEL_MACHINE_LINK_ADDR/g (Re: [PATCH] i386-qemu port) Robert Millan
2009-06-22 19:00 ` Pavel Roskin
2009-06-22 23:07 ` clean patch for i386-qemu port " Robert Millan
2009-06-23 1:29 ` Pavel Roskin
2009-06-23 11:38 ` Robert Millan
2009-06-23 12:13 ` Robert Millan
2009-06-24 1:00 ` Robert Millan
2009-06-24 23:10 ` [PATCH] fix for loading modules from read-only memory area (Re: clean patch for i386-qemu port (Re: [PATCH] i386-qemu port)) Robert Millan
2009-06-25 19:53 ` Pavel Roskin
2009-06-25 20:31 ` Robert Millan
2009-06-25 20:51 ` Pavel Roskin
2009-06-26 14:41 ` Robert Millan
2009-06-26 16:44 ` Pavel Roskin
2009-06-26 17:03 ` Robert Millan
2009-06-26 17:16 ` Pavel Roskin
2009-06-26 17:43 ` Robert Millan
2009-06-26 19:52 ` Pavel Roskin
2009-06-26 22:26 ` Pavel Roskin
2009-06-26 23:57 ` Robert Millan
2009-06-27 3:08 ` Pavel Roskin
2009-06-27 11:18 ` Robert Millan
2009-06-29 3:48 ` Pavel Roskin
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