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SubjectRe: [PATCH] ia64: fix ptrace(PTRACE_SYSCALL_INFO_EXIT) sign
On Sun, 21 Feb 2021 10:21:56 +0100
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> wrote:

> Hi Sergei!
>
> On 2/21/21 1:25 AM, Sergei Trofimovich wrote:
> > In https://bugs.gentoo.org/769614 Dmitry noticed that
> > `ptrace(PTRACE_GET_SYSCALL_INFO)` does not return error sign properly.
> > (...)
>
> Do these two patches unbreak gdb on ia64?

gdb was somewhat working on ia64 for Gentoo. strace was the main
impacted here.

But I did not try anything complicated recently. Anything specific that
breaks for you?

$ uname -r
5.10.0
(even without the patches above)

$ cat c.c
int main(){}
$ gcc c.c -o a -ggdb3
$ gdb --quiet ./a
Reading symbols from ./a...
(gdb) start
Temporary breakpoint 1 at 0x7f2: file c.c, line 1.
Starting program: /home/slyfox/a
Failed to read a valid object file image from memory.

Temporary breakpoint 1, main () at c.c:1
1 int main(){}
(gdb) disassemble
Dump of assembler code for function main:
0x20000008000007f0 <+0>: [MII] mov r2=r12
0x20000008000007f1 <+1>: mov r14=r0;;
=> 0x20000008000007f2 <+2>: mov r8=r14
0x2000000800000800 <+16>: [MIB] mov r12=r2
0x2000000800000801 <+17>: nop.i 0x0
0x2000000800000802 <+18>: br.ret.sptk.many b0;;
End of assembler dump.
(gdb) break *0x2000000800000800
Breakpoint 2 at 0x2000000800000800: file c.c, line 1.
(gdb) continue
Continuing.

Breakpoint 2, 0x2000000800000800 in main () at c.c:1
1 int main(){}

Looks ok for minor stuff.

> And have you, by any chance, managed to get the hpsa driver working again?

v5.10 seems to boot off hpsa just fine without extra patches:
14:01.0 RAID bus controller: Hewlett-Packard Company Smart Array P600
Subsystem: Hewlett-Packard Company 3 Gb/s SAS RAID
Kernel driver in use: hpsa

v5.11 does not boot yet. Kernel does not see some files while boots after init is
started (but I'm not sure it's a block device problem). Bisecting now why.

--

Sergei

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