* RFC: Alignment and sizes of .note.ABI-tag and .note.gnu.build-id in 64-bit ELF objects
@ 2017-03-31 17:17 H.J. Lu
2017-03-31 20:30 ` Nicholas Miell
0 siblings, 1 reply; 3+ messages in thread
From: H.J. Lu @ 2017-03-31 17:17 UTC (permalink / raw)
To: Binutils, GNU C Library
According to gABI, in 64-bit objects, each note entry is an array of 8-bye
words in the format of the target processor. But I got
[ 2] .note.ABI-tag NOTE 0000000000000254 000254
000020 00 A 0 0 4
[ 3] .note.gnu.build-id NOTE 0000000000000274 000274
000024 00 A 0 0 4
on x86-64. .note.ABI-tag size is 32, but it isn't aligned at 8 bytes.
.note.gnu.build-id size is 36, which isn't multiple of 8 bytes. Should
they be padded to multiple of 8 bytes and aligned to 8 bytes for 64-bit
objects?
--
H.J.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: RFC: Alignment and sizes of .note.ABI-tag and .note.gnu.build-id in 64-bit ELF objects
2017-03-31 17:17 RFC: Alignment and sizes of .note.ABI-tag and .note.gnu.build-id in 64-bit ELF objects H.J. Lu
@ 2017-03-31 20:30 ` Nicholas Miell
2017-03-31 22:45 ` Nicholas Miell
0 siblings, 1 reply; 3+ messages in thread
From: Nicholas Miell @ 2017-03-31 20:30 UTC (permalink / raw)
To: H.J. Lu, Binutils, GNU C Library
On 03/31/2017 10:17 AM, H.J. Lu wrote:
> According to gABI, in 64-bit objects, each note entry is an array of 8-bye
> words in the format of the target processor. But I got
>
> [ 2] .note.ABI-tag NOTE 0000000000000254 000254
> 000020 00 A 0 0 4
> [ 3] .note.gnu.build-id NOTE 0000000000000274 000274
> 000024 00 A 0 0 4
>
> on x86-64. .note.ABI-tag size is 32, but it isn't aligned at 8 bytes.
> .note.gnu.build-id size is 36, which isn't multiple of 8 bytes. Should
> they be padded to multiple of 8 bytes and aligned to 8 bytes for 64-bit
> objects?
>
The spec is wrong, ELF notes are always arrays of 4-byte words in the
format of the target processor.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: RFC: Alignment and sizes of .note.ABI-tag and .note.gnu.build-id in 64-bit ELF objects
2017-03-31 20:30 ` Nicholas Miell
@ 2017-03-31 22:45 ` Nicholas Miell
0 siblings, 0 replies; 3+ messages in thread
From: Nicholas Miell @ 2017-03-31 22:45 UTC (permalink / raw)
To: binutils; +Cc: libc-alpha
On 03/31/2017 10:17 AM, H.J. Lu wrote:
> According to gABI, in 64-bit objects, each note entry is an array of 8-bye
> words in the format of the target processor. But I got
>
> [ 2] .note.ABI-tag NOTE 0000000000000254 000254
> 000020 00 A 0 0 4
> [ 3] .note.gnu.build-id NOTE 0000000000000274 000274
> 000024 00 A 0 0 4
>
> on x86-64. .note.ABI-tag size is 32, but it isn't aligned at 8 bytes.
> .note.gnu.build-id size is 36, which isn't multiple of 8 bytes. Should
> they be padded to multiple of 8 bytes and aligned to 8 bytes for 64-bit
> objects?
>
The spec is wrong, ELF notes are always arrays of 4-byte words in the
format of the target processor.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2017-03-31 20:30 UTC | newest]
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2017-03-31 17:17 RFC: Alignment and sizes of .note.ABI-tag and .note.gnu.build-id in 64-bit ELF objects H.J. Lu
2017-03-31 20:30 ` Nicholas Miell
2017-03-31 22:45 ` Nicholas Miell
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