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Using SCODB

Registers

Registers can be accessed by using a percent (%) in front of the register name, and are considered lvalues (though extreme care should be used in modifying them):

   debug0:12> %eax
   FFFFFFFF
   debug0:13> %eax = 0
   0
The registers are:

General registers:
eax function return value
ebx general use
ecx general use, counter
edx general use
ebp stack frame base pointer
esp kernel stack pointer
uesp user process stack pointer
esi general use, source index
edi general use, destination index
Segment registers:
cs code
ds data
es extra data
fs extra data
gs extra data
ss stack
Memory management registers:
gdtr Global Descriptor Table Register
ldtr Local Descriptor Table Register
idtr Interrupt Descriptor Table Register
tr Task register
Control registers:
cr0 system control flags
cr1 unused
cr2 page fault linear address
cr3 page directory base
Other registers and pseudo-registers:
eip location processor is executing code
efl flags
trap system trap number
proc processor running on (for MPX)

The stack segment register, memory-management and control registers, as well as the pseudo-registers trap and proc, are not considered lvalues.


© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003