From: Richard Earnshaw <rearnsha@arm.com>
To: gdb-patches@cygnus.com
Cc: richard.earnshaw@arm.com
Subject: Re: support for ARM GNU/Linux
Date: Wed, 14 Apr 1999 03:36:00 -0000 [thread overview]
Message-ID: <199904140952.KAA25068@sun52.NIS.cambridge> (raw)
In-Reply-To: <37142B16.B43B5200@cygnus.com>
ac131313@cygnus.com said:
> I'm slightly curious about what is going on with all these different
> breakpoints (I should hasten to point out that I'm _not_ the ARM
> expert/maintainer :-). Stan Shebs recently commited the change:
> 1999-03-02 Stan Shebs <shebs@andros.cygnus.com>
> From Gary Thomas <gthomas@cygnus.co.uk>:
> * arm-tdep.c (ARM_LE_BREAKPOINT, ARM_BE_BREAKPOINT,
> THUMB_LE_BREAKPOINT, THUMB_BE_BREAKPOINT): Use illegal instruction
> instead of SWI 24.
> * config/arm/tm-arm.h (CALL_DUMMY): Ditto.
> (IN_SIGTRAMP): Define.
A bit of history. SWI 24 was the breakpoint swi in RISC iX, which the
kernel understood (in some way). I don't know if it was necessary to use
exactly that SWI if you were using gdb or if the same effect could be
achieved with other illegal instructions.
A side-note, before ARM Architecture v4 many "undefined" instruction
formats aren't guaranteed to take the undefined instruction trap. Also
note that, in this respect, the ARM7TDMI is NOT fully ARM v4 compliant.
I don't know if anyone cares about RISC iX support any more (though gcc
still supports it).
Richard.
WARNING: multiple messages have this Message-ID
From: Richard Earnshaw <rearnsha@arm.com>
To: gdb-patches@cygnus.com
Cc: richard.earnshaw@arm.com
Subject: Re: support for ARM GNU/Linux
Date: Wed, 14 Apr 1999 02:52:00 -0000 [thread overview]
Message-ID: <199904140952.KAA25068@sun52.NIS.cambridge> (raw)
Message-ID: <19990414025200.eflnMvOLVlZ3_XFmwd1LIE8vcgmJTbhik5WHglGzVAQ@z> (raw)
In-Reply-To: <37142B16.B43B5200@cygnus.com>
ac131313@cygnus.com said:
> I'm slightly curious about what is going on with all these different
> breakpoints (I should hasten to point out that I'm _not_ the ARM
> expert/maintainer :-). Stan Shebs recently commited the change:
> 1999-03-02 Stan Shebs <shebs@andros.cygnus.com>
> From Gary Thomas <gthomas@cygnus.co.uk>:
> * arm-tdep.c (ARM_LE_BREAKPOINT, ARM_BE_BREAKPOINT,
> THUMB_LE_BREAKPOINT, THUMB_BE_BREAKPOINT): Use illegal instruction
> instead of SWI 24.
> * config/arm/tm-arm.h (CALL_DUMMY): Ditto.
> (IN_SIGTRAMP): Define.
A bit of history. SWI 24 was the breakpoint swi in RISC iX, which the
kernel understood (in some way). I don't know if it was necessary to use
exactly that SWI if you were using gdb or if the same effect could be
achieved with other illegal instructions.
A side-note, before ARM Architecture v4 many "undefined" instruction
formats aren't guaranteed to take the undefined instruction trap. Also
note that, in this respect, the ARM7TDMI is NOT fully ARM v4 compliant.
I don't know if anyone cares about RISC iX support any more (though gcc
still supports it).
Richard.
next prev parent reply other threads:[~1999-04-14 3:36 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-04-12 12:26 Philip Blundell
1999-04-12 13:19 ` Scott Bambrough
1999-04-12 14:12 ` Scott Bambrough
1999-04-12 14:27 ` Philip Blundell
1999-04-12 20:18 ` Jim Blandy
1999-04-13 6:45 ` Philip Blundell
[not found] ` <E10X3Uv-0003Kd-00.cygnus.patches.gdb@fountain.nexus.co.uk>
1999-04-13 22:44 ` Andrew Cagney
1999-04-14 2:21 ` Philip Blundell
1999-04-14 3:36 ` Richard Earnshaw [this message]
1999-04-14 2:52 ` Richard Earnshaw
1999-04-14 11:34 ` Stan Shebs
1999-04-14 12:18 ` Richard Earnshaw
[not found] ` <37142B16.B43B5200.cygnus.patches.gdb@cygnus.com>
1999-04-13 23:56 ` Andrew Cagney
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