Re: trap and frame address

To: tech-kern%netbsd.org@localhost
Subject: Re: trap and frame address
From: Beesdeckar <beesdeckar%softinengines.com@localhost>
Date: Sat, 29 Mar 2025 18:01:26 +0100

Update:

When I use address from gdb bt output:
...
#4  0xffffffff8023c185 in trap (frame=0xffffb80384d5ae90) at /usr/src/
sys/arch/amd64/amd64/trap.c:326
...

and display content of memory then I can find error 2 and trap number 6in down of output below. In accordance with struct trapframe for amd64stored rbp register should be: 0xffffdb8384d5afd0, but when I try:

(gdb) frame address 0xffffdb8384d5afd0
No frame at address 0xffffdb8384d5afd0.

What am I doing wrong ?




(gdb) x/50x 0xffffdb8384d5ae90

0xffffdb8384d5ae90: 0x0000001a 0x00000000 0x84d300000xffffdb830xffffdb8384d5aea0: 0x00000008 0x00000000 0x000000000x000000000xffffdb8384d5aeb0: 0x00000008 0x00000000 0x88d900340xffffbbe40xffffdb8384d5aec0: 0x880cc388 0xffffbbe4 0x000000010x000000000xffffdb8384d5aed0: 0x84d5afd0 0xffffdb83 0x000001000x000000000xffffdb8384d5aee0: 0x879b52c0 0xffffbbe4 0x000000000x000000000xffffdb8384d5aef0: 0x8a315770 0xffffbbe4 0x8a3157700xffffbbe40xffffdb8384d5af00: 0x8a315770 0xffffbbe4 0x19c480000xffffdb800xffffdb8384d5af10: 0x84d5afd0 0xffffdb83 0x000001000x000000000xffffdb8384d5af20: 0x00000000 0x00000000 0x000000080xffffffff0xffffdb8384d5af30: 0x84d5af90 0xffffdb83 0x84d5af400xffffdb830xffffdb8384d5af40: 0x0000000e 0x00000000 0x000000060x00000000

0xffffdb8384d5af50:     0x00000002      0x00000000

References:
- trap and frame address
  - From: Beesdeckar

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