[superh-gnu-discuss] Problems with gdbserver

[Szafranek, Michael]

Hello,

I have also the same problem with gdb. At least it looks like the same. When I try to debug a simple program, it crashes with the following message:

Process /usr/local/bin/hello_world created; pid = 573
Listening on port 2000
Remote debugging from host 192.168.1.54
[   35.916000] Unable to handle kernel NULL pointer dereference at virtual address 00000084
[   35.924000] pc = 880049c2
[   35.928000] *pde = 8e280000
[   35.932000] Oops: 0001 [#1]
[   35.932000] last sysfs file: /sys/devices/platform/sh_mobile_lcdc_fb.0/graphics/fb0/modes
[   35.932000] Modules linked in: sh772x_gfx
[   35.932000]
[   35.932000] Pid : 570, Comm:                 gdbserver
[   35.932000] CPU : 0                  Not tainted  (2.6.35em1+ #10)
[   35.932000]
[   35.932000] PC is at arch_ptrace+0x1e2/0x360
[   35.932000] PR is at sys_ptrace+0x5e/0x120
[   35.932000] PC  : 880049c2 SP  : 8e28ff84 SR  : 40008100 TEA : c01099b0
[   35.932000] R0  : 00000084 R1  : 00000000 R2  : 00000084 R3  : 00402000
[   35.932000] R4  : 8f49aa00 R5  : 00000000 R6  : 00000084 R7  : 00000000
[   35.932000] R8  : 8f49aa00 R9  : 00000000 R10 : 00000006 R11 : 8f49aa08
[   35.932000] R12 : 000000e0 R13 : 00000000 R14 : 7bbf98cc
[   35.932000] MACH: 00000004 MACL: 07382aed GBR : 296ed450 PR  : 8802445e
[   35.932000]
[   35.932000] Call trace:
[   35.932000]  [<8802445e>] sys_ptrace+0x5e/0x120
[   35.932000]  [<88008216>] syscall_call+0xc/0x10
[   35.932000]  [<88024400>] sys_ptrace+0x0/0x120
[   35.932000]
[   35.932000] Process: gdbserver (pid: 570, stack limit = 8e28e001)
[   35.932000] Stack: (0x8e28ff84 to 0x8e290000)
[   35.932000] ff80:          8802445e 88008216 7bbf9920 296e97b8 00000000 00000071 00000100
[   35.932000] ffa0: 88024400 7bbf9920 00000002 00000005 0000001a 00000006 0000023d 000000e0
[   35.932000] ffc0: 00000000 00000006 00000017 0042345c 00000004 296e97b8 7bbf9920 7bbf98cc
[   35.932000] ffe0: 7bbf98cc 2966af58 0040dbe4 00000101 296ed450 00000004 ffffffd0 00000050
[   36.068000] ---[ end trace e81945113d99b498 ]---
[   36.072000] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[   36.072000] pc = 8800a090
[   36.072000] *pde = 8e26b000
[   36.072000] Oops: 0000 [#2]
[   36.072000] last sysfs file: /sys/devices/platform/sh_mobile_lcdc_fb.0/graphics/fb0/modes
[   36.072000] Modules linked in: sh772x_gfx
[   36.072000]
[   36.072000] Pid : 573, Comm:                 hello_world
[   36.072000] CPU : 0                  Tainted: G      D      (2.6.35em1+ #10)
[   36.072000]
[   36.072000] PC is at restore_fpu+0x10/0x80
[   36.072000] PR is at __fpu_state_restore+0xe/0x40
[   36.072000] PC  : 8800a090 SP  : 8e2c7f98 SR  : 400000f0 TEA : 00000000
[   36.072000] R0  : 000001ec R1  : 00000000 R2  : 00000000 R3  : 00000001
[   36.072000] R4  : 8f49aa00 R5  : 00000000 R6  : 7ba55933 R7  : 295633e0
[   36.072000] R8  : 8f49aa00 R9  : 880080ec R10 : 8800e120 R11 : 7ba55933
[   36.072000] R12 : 29583004 R13 : 004105c0 R14 : 7ba55784
[   36.072000] MACH: 0000002c MACL: 00000280 GBR : 296ed450 PR  : 8800df0e
[   36.072000]
[   36.072000] Call trace:
[   36.072000]  [<8800e12c>] fpu_state_restore_trap_handler+0xc/0x20
[   36.072000]  [<880080ec>] ret_from_exception+0x0/0xc
[   36.072000]
[   36.072000] Process: hello_world (pid: 573, stack limit = 8e2c6001)
[   36.072000] Stack: (0x8e2c7f98 to 0x8e2c8000)
[   36.072000] 7f80:                                                       8800e12c 400080f0
[   36.072000] 7fa0: 880080ec 000000e0 00008f7e 00000000 79f8fcfc 7ba557e0 00000000 7ba55933
[   36.072000] 7fc0: 295633e0 7ba55798 004001a1 29573168 7ba55933 29583004 004105c0 7ba55784
[   36.072000] 7fe0: 7ba55784 2956cce2 29563d62 00000001 296ed450 0000002c 00000280 ffffffff
[   36.224000] ---[ end trace e81945113d99b499 ]---
Segmentation fault

Any idea how to solve this problem?

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