* [9fans] Disassembler?
@ 2008-05-02 10:14 Anant Narayanan
2008-05-02 10:21 ` Pietro Gagliardi
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Anant Narayanan @ 2008-05-02 10:14 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
Hi,
Is there a tool available which can convert plan 9 a.out executables
to plan 9 assembly code? I'd like to know how the C compiler stores
arguments for a system call on the stack for x86.
8c -S does not help, since all it displays is: `call print', instead
of what instructions are actually executed when print is called.
Regards,
Anant
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [9fans] Disassembler?
2008-05-02 10:14 [9fans] Disassembler? Anant Narayanan
@ 2008-05-02 10:21 ` Pietro Gagliardi
2008-05-02 11:20 ` erik quanstrom
2008-05-02 11:32 ` Charles Forsyth
2 siblings, 0 replies; 5+ messages in thread
From: Pietro Gagliardi @ 2008-05-02 10:21 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
On May 2, 2008, at 6:14 AM, Anant Narayanan wrote:
> Hi,
>
> Is there a tool available which can convert plan 9 a.out executables
> to plan 9 assembly code? I'd like to know how the C compiler stores
> arguments for a system call on the stack for x86.
>
> 8c -S does not help, since all it displays is: `call print', instead
> of what instructions are actually executed when print is called.
>
> Regards,
> Anant
>
>
8c doesn't use push or pop. It stores values directly onto the stack
with MOVL AX, 4(SP) for the second argument. This implies you'll need
to allocate enough stack space:
TEXT x, 0, $12
will give you enough for 2 arguments (don't tell me why not 3).
The compilers push arguments left to right every 4 bytes.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [9fans] Disassembler?
2008-05-02 10:14 [9fans] Disassembler? Anant Narayanan
2008-05-02 10:21 ` Pietro Gagliardi
@ 2008-05-02 11:20 ` erik quanstrom
2008-05-02 11:32 ` Charles Forsyth
2 siblings, 0 replies; 5+ messages in thread
From: erik quanstrom @ 2008-05-02 11:20 UTC (permalink / raw)
To: 9fans
> Hi,
>
> Is there a tool available which can convert plan 9 a.out executables
> to plan 9 assembly code? I'd like to know how the C compiler stores
> arguments for a system call on the stack for x86.
>
> 8c -S does not help, since all it displays is: `call print', instead
> of what instructions are actually executed when print is called.
>
> Regards,
> Anant
if i understand you correctly, that's because print is in a library
and is called not inline. you can use acid on the executable to
asm(print)
which disassembles code starting at print.
- erik
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [9fans] Disassembler?
2008-05-02 10:14 [9fans] Disassembler? Anant Narayanan
2008-05-02 10:21 ` Pietro Gagliardi
2008-05-02 11:20 ` erik quanstrom
@ 2008-05-02 11:32 ` Charles Forsyth
2008-05-02 11:53 ` Charles Forsyth
2 siblings, 1 reply; 5+ messages in thread
From: Charles Forsyth @ 2008-05-02 11:32 UTC (permalink / raw)
To: 9fans
i normally give the -a option to 8l(1)
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2008-05-02 11:53 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2008-05-02 10:14 [9fans] Disassembler? Anant Narayanan
2008-05-02 10:21 ` Pietro Gagliardi
2008-05-02 11:20 ` erik quanstrom
2008-05-02 11:32 ` Charles Forsyth
2008-05-02 11:53 ` Charles Forsyth
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