What is the role of DR0 to DR3 registers in debugging?

DR0 to DR3 The debug address registers are effective whether or not paging is enabled. If paging is enabled, the linear addresses are translated into physical addresses by the processor’s paging mechanism. If paging is not enabled, these linear addresses are the same as physical addresses.

Which debug registers is called as debug control register in 80386?

The three special registers, namely Control registers CR0-CR3, Debug Register DR0-DR7 & Test Register TR6-TR7, are defined briefly in this context.

How many debug registers are present in 80386 list and draw all of them?

12.2 Debug Registers. Six 80386 registers are used to control debug features. These registers are accessed by variants of the MOV instruction. A debug register may be either the source operand or destination operand.

Which debug registers are reserved by Intel for future?

Explanation: Out of the eight debug registers, the two registers DR4 and DR5 are Intel reserved. Explanation: The initial four registers, DR0-DR3 store four program controllable break point addresses. Explanation: The registers DR6 and DR7 respectively hold break point status and break point control information.

What is the size of debug registers in 80386dx microprocessor?

eight 32 – bit
The 80386 has eight 32 – bit general purpose registers which may be used as either 8 bit or 16 bit registers. A 32 – bit register known as an extended register, is represented by the register name with prefix E.

What is the use of base registers and offset registers?

The base address register is a pointer to a byte in memory, and the offset specifies a number of bytes. Immediate means the address is calculated using the base address register and a 12-bit offset encoded in the instruction.

What is the size of debug registers in 80386?

32 – bit

What are the different control registers in 80386?

Four registers of the 80386 locate the data structures that control segmented memory management: GDTR Global Descriptor Table Register. LDTR Local Descriptor Table Register. IDTR Interrupt Descriptor Table Register.

What is the size of debug registers in 80386dx microprocessor Mcq?

Explanation: The 80386, with its 32-bit address bus, can address up to 4 GB of physical memory. Explanation: The 80386 offers a set of total eight debug registers DR0-DR7, for hardware debugging and control.

What is the function of segment registers Mcq?

Explanation: The segment descriptor register is used to store the descriptor information like attributes, limit and base addresses of segments.

What is maximum size of segment for 80386DX microprocessor Why?

80386 can have max 4GB physical memory & can have 16384 segments of 64KB each.

What is the size of each descriptor in GDT?

GDT. The GDT table contains a number of entries called Segment Descriptors. Each is 8 bytes long and contains information on the starting point of the segment, the length of the segment, and the access rights of the segment.

What is the use of the DR7 Register in a computer?

The DR7 register is called the Debug Control register, and is used to set bit flags for the DR0 to DR3 registers, the first two flags are used to set a breakpoint for a local task or a global task. On Windows, you can only set breakpoints for local tasks, and therefore after a task swtich, the breakpoint is cleared.

What is a debug address in DR7?

Each of these registers contains the linear address associated with one of four breakpoint conditions. Each breakpoint condition is further defined by bits in DR7. The debug address registers are effective whether or not paging is enabled. The addresses in these registers are linear addresses.

What is the difference between DR0 DR3 and DR7?

DR0 to DR3 Each of these registers contains the linear address associated with one of four breakpoint conditions. Each breakpoint condition is further defined by bits in DR7. The debug address registers are effective whether or not paging is enabled.

How many debug registers are there in a microcontroller?

There are six debug registers, named DR0 DR7, with DR4 and DR5 as obsolete synonyms for DR6 and DR7. The debug registers allow programmers to selectively enable various debug conditions associated with a set of four debug addresses. Two of these registers are used to control debug features.

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