Re: [PATCH] Fix call functions command bug in 64-bit programs for AIX

Aditya Kamath1 via Gdb-patches
2022-11-14T18:53:12Z

Hi Ulrich,

Sure. This is done..

The code is

if (register_size (gdbarch, regno) == 8)

memcpy (&buf, addr, 8);

else

buf = *addr;

printf ("val in regno = %d via buf is %lld and *addr is %d, regsize =

%d\n", regno, buf, *addr, register_size (gdbarch, regno));

rs6000_ptrace64 (PT_WRITE_GPR, pid, nr, 0, &buf);

}

in store_register (struct regcache *regcache, int regno)...

The output is as shown below:-

Reading symbols from /home/XYZ/gdb_tests...

(gdb) b main

Breakpoint 1 at 0x100007dc: file /home/XYZ/gdb_tests.c, line 22.

(gdb) r

Starting program: /home/XYZ/gdb_tests

BFD: /usr/lib/libc.a(/usr/lib/libc.a(shr_64.o)): wrong auxtype 0xff for storage class 0x2

BFD: /usr/lib/libc.a(/usr/lib/libc.a(shr_64.o)): wrong auxtype 0xff for storage class 0x6b

Breakpoint 1, main (argc=1, argv=0xffffffffffffad0)

at /home/aditya/gdb_tests.c:22

warning: Source file is more recent than executable.

22 printf("Hi Bangalore %x\n",num2print(27, 16, 13, 9.9));

(gdb) call num2print

$1 = {int (long, float, int, int)} 0x1000006a0 <num2print>

(gdb) call num2print (2, 3, 4, 6)

val in regno = 3 via buf is 2 and *addr is 0, regsize = 8

val in regno = 4 via buf is 4629700416936869888 and *addr is 1077936128, regsize = 8

val in regno = 5 via buf is 17179869184 and *addr is 4, regsize = 8

val in regno = 6 via buf is 25769803776 and *addr is 6, regsize = 8....

R2

R3.000000

R0

R0.000000

$2 = 2

I have cut short those print statements.. Full output is below

Have a nice day ahead..

Thanks,
Aditya..

--------------------

22 printf("Hi Bangalore %x\n",num2print(27, 16, 13, 9.9));

(gdb) call num2print

$1 = {int (long, float, int, int)} 0x1000006a0 <num2print>

(gdb) call num2print (2, 3, 4, 6)

val in regno = 3 via buf is 2 and *addr is 0, regsize = 8

val in regno = 4 via buf is 4629700416936869888 and *addr is 1077936128, regsize = 8

val in regno = 5 via buf is 17179869184 and *addr is 4, regsize = 8

val in regno = 6 via buf is 25769803776 and *addr is 6, regsize = 8

val in regno = 1 via buf is 1152921504606845280 and *addr is 268435455, regsize = 8

val in regno = 67 via buf is 4294968448 and *addr is 1, regsize = 8

val in regno = 0 via buf is 4294968564 and *addr is 1, regsize = 8

val in regno = 1 via buf is 1152921504606845280 and *addr is 268435455, regsize = 8

val in regno = 2 via buf is 4563403472 and *addr is 1, regsize = 8

val in regno = 3 via buf is 2 and *addr is 0, regsize = 8

val in regno = 4 via buf is 4629700416936869888 and *addr is 1077936128, regsize = 8

val in regno = 5 via buf is 17179869184 and *addr is 4, regsize = 8

val in regno = 6 via buf is 25769803776 and *addr is 6, regsize = 8

val in regno = 7 via buf is 1152921504606846944 and *addr is 268435455, regsize = 8

val in regno = 8 via buf is 0 and *addr is 0, regsize = 8

val in regno = 9 via buf is 1 and *addr is 0, regsize = 8

val in regno = 10 via buf is 0 and *addr is 0, regsize = 8

val in regno = 11 via buf is 4144 and *addr is 0, regsize = 8

val in regno = 12 via buf is -1080857313497259912 and *addr is -251656704, regsize = 8

val in regno = 13 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 14 via buf is 1 and *addr is 0, regsize = 8

val in regno = 15 via buf is 1152921504606845648 and *addr is 268435455, regsize = 8

val in regno = 16 via buf is 1152921504606845664 and *addr is 268435455, regsize = 8

val in regno = 17 via buf is 576495942044221440 and *addr is 134225921, regsize = 8

val in regno = 18 via buf is 1152921504606846672 and *addr is 268435455, regsize = 8

val in regno = 19 via buf is 720575940110904384 and *addr is 167772159, regsize = 8

val in regno = 20 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 21 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 22 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 23 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 24 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 25 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 26 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 27 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 28 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 29 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 30 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 31 via buf is 1152921504606845408 and *addr is 268435455, regsize = 8

val in regno = 64 via buf is 4294969308 and *addr is 1, regsize = 8

val in regno = 65 via buf is -6917529027640897486 and *addr is -1610612736, regsize = 8

val in regno = 66 via buf is 1109656104 and *addr is 1109656104, regsize = 4

val in regno = 67 via buf is 4294968448 and *addr is 1, regsize = 8

val in regno = 68 via buf is 0 and *addr is 0, regsize = 8

val in regno = 69 via buf is 0 and *addr is 0, regsize = 4

val in regno = 70 via buf is 0 and *addr is 0, regsize = 4

val in regno = 64 via buf is 4294968992 and *addr is 1, regsize = 8

R2

R3.000000

R0

R0.000000

val in regno = 0 via buf is 4294968564 and *addr is 1, regsize = 8

val in regno = 1 via buf is 1152921504606845408 and *addr is 268435455, regsize = 8

val in regno = 2 via buf is 4563403472 and *addr is 1, regsize = 8

val in regno = 3 via buf is 1 and *addr is 0, regsize = 8

val in regno = 4 via buf is 1152921504606845648 and *addr is 268435455, regsize = 8

val in regno = 5 via buf is 1152921504606845664 and *addr is 268435455, regsize = 8

val in regno = 6 via buf is -9223372036854722510 and *addr is -2147483648, regsize = 8

val in regno = 7 via buf is 1152921504606846944 and *addr is 268435455, regsize = 8

val in regno = 8 via buf is 0 and *addr is 0, regsize = 8

val in regno = 9 via buf is 1 and *addr is 0, regsize = 8

val in regno = 10 via buf is 0 and *addr is 0, regsize = 8

val in regno = 11 via buf is 4144 and *addr is 0, regsize = 8

val in regno = 12 via buf is -1080857313497259912 and *addr is -251656704, regsize = 8

val in regno = 13 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 14 via buf is 1 and *addr is 0, regsize = 8

val in regno = 15 via buf is 1152921504606845648 and *addr is 268435455, regsize = 8

val in regno = 16 via buf is 1152921504606845664 and *addr is 268435455, regsize = 8

val in regno = 17 via buf is 576495942044221440 and *addr is 134225921, regsize = 8

val in regno = 18 via buf is 1152921504606846672 and *addr is 268435455, regsize = 8

val in regno = 19 via buf is 720575940110904384 and *addr is 167772159, regsize = 8

val in regno = 20 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 21 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 22 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 23 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 24 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 25 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 26 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 27 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 28 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 29 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 30 via buf is -4982089500409860083 and *addr is -1159983106, regsize = 8

val in regno = 31 via buf is 1152921504606845408 and *addr is 268435455, regsize = 8

val in regno = 64 via buf is 4294969308 and *addr is 1, regsize = 8

val in regno = 65 via buf is -6917529027640897486 and *addr is -1610612736, regsize = 8

val in regno = 66 via buf is 1109656104 and *addr is 1109656104, regsize = 4

val in regno = 67 via buf is 4294968564 and *addr is 1, regsize = 8

val in regno = 68 via buf is 0 and *addr is 0, regsize = 8

val in regno = 69 via buf is 0 and *addr is 0, regsize = 4

val in regno = 70 via buf is 0 and *addr is 0, regsize = 4

$2 = 2

(gdb)

val = 0 in regno 51

val = 0 in regno 52

val = 0 in regno 52

val = 0 in regno 53

val = 0 in regno 53

val = 0 in regno 54

val = 0 in regno 54

val = 0 in regno 55

val = 0 in regno 55

val = 0 in regno 56

val = 0 in regno 56

val = 0 in regno 57

val = 0 in regno 57

val = 0 in regno 58

val = 0 in regno 58

val = 0 in regno 59

val = 0 in regno 59

val = 0 in regno 60

val = 0 in regno 60

val = 0 in regno 61

val = 0 in regno 61

val = 0 in regno 62

val = 0 in regno 62

(gdb)

(gdb)

________________________________
From: Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
Sent: 15 November 2022 00:13
To: gdb-patches@sourceware.org <gdb-patches@sourceware.org>; Aditya Kamath1 <Aditya.Kamath1@ibm.com>; simon.marchi@efficios.com <simon.marchi@efficios.com>
Cc: Sangamesh Mallayya <sangamesh.swamy@in.ibm.com>; Sanket Rathi <sanrathi@in.ibm.com>
Subject: Re: [PATCH] Fix call functions command bug in 64-bit programs for AIX

Aditya Kamath1 <Aditya.Kamath1@ibm.com> wrote:

> {
> /* PT_WRITE_GPR requires the buffer parameter to point to an 8-byte
> area, even if the register is really only 32 bits. */
> long long buf;
> if (register_size (gdbarch, regno) == 8)
> memcpy (&buf, addr, 8);
> else
> buf = *addr;
> printf ("val in regno = %d via buf is %d and *addr is %d\n", regno, bu
f, *addr);

This doesn't work - buf is a "long long", so you need to use "%lld" to print
it, not just "%d". That's why the output for "buf" was wrong.

Also, please print the result of "register_size (gdbarch, regno)" as well,
so we know for sure which part of the if condition is actually taken.

Bye,
Ulrich