Exception Vector Table

An interrupt vector table ivt is a data structure that associates a list of interrupt handlers with a list of interrupt requests in a table of interrupt vectors. Table 27 shows the exception vector addresses and entry conditions for the different exception types.

Cortex M3 Devices Generic User Guide Vector Table Arm Developer

In the arm architecture exception vectors are stored in a table called the exception vector table.

Exception vector table. N if the system has a cache the vector table and fiq handler may all be locked down in one block. Each entry of the interrupt vector table called an interrupt vector is the address of an interrupt handler. Each exception level has its own vector table that is there is one for each of el3 el2 and el1.

For example when a software interrupt is raised execution is transfered to the software interrupt entry in the table which in turn will jump to the syscall handler. N removes the need for a branch and its associated delays. Table 26 shows the cp15 c1 control register v bit settings for configuring the location of the exception vector addresses.

The vector table contains the reset value of the stack pointer and the start addresses also called exception vectors for all exception handlers. O fiq handler can be placed directly at the vector location and run sequentially from that address. The least significant bit of each vector must be 1 indicating that the exception handler is thumb code see thumb state.

The exception vector table the vector table is a table that actually contains control transfer instructions that jump to the respective exception handlers. The table contains instructions to be executed rather than a set of addresses. The location in memory where the handler is stored is called the exception vector.

Traditionally all coding that appertains to interrupts has been performed in assembler. The usual way that these are managed is to have a table of addresses of the isrs the interrupt or exception vector. The least significant bit of each vector must be 1 indicating that the exception handler is thumb code see thumb state.

N fiq vector is the last entry in the vector table. Figure 21 shows the order of the exception vectors in the vector table. However this is rarely necessary and a high level language c or cc may generally be used.

The vector table contains the reset value of the stack pointer and the start addresses also called exception vectors for all exception handlers. Figure 22 shows the order of the exception vectors in the vector table.

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