Re: nios2: is the ptrace ABI correct?

From: Ezequiel Garcia
Date: Mon Mar 09 2015 - 13:08:08 EST

On 03/09/2015 02:02 PM, Chung-Lin Tang wrote:
> On 2015/3/10 12:54 AM, Chung-Lin Tang wrote:
>> It appears that some of the ways nios2 has organized the
>> ucontext/pt_regs/etc. are remnants of the pre-generic code, some
>> basically because the port was based off m68k.
>> I've re-organized the headers a bit: nios2/include/asm/ucontext.h is
>> deleted, and re-definition of struct sigcontext now allows use of
>> uapi/asm-generic/ucontext.h directly. Note that the reorg, despite
>> effectively renaming some fields, is still binary compatible. I'll
>> probably update the corresponding glibc definitions later.
>> struct pt_regs is now not exported, and all exported register sets are
>> now supposed to follow the 49 register set defined as in GDB now.
>> Tobias, Ley Foon, how do you think this looks?
> Sorry, accidentally attached unrelated GCC patch instead, this one's the
> correct one.

Looks good. I'm wondering if...

+/* User structures for general purpose registers. */
+struct user_pt_regs {
+ __u32 regs[49];

Can we expose the registers explicitly here? Like this:

struct user_pt_regs {
__u32 r0;
__u32 r1;
__u32 sp;
__u32 gp;
__u32 estatus;

It looks self-documenting and thus easier to use.
Ezequiel Garcia, VanguardiaSur
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