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accessing registers

how can i obtain the current values of registers like accumulator,B,stack pointer,PSW,DPTR,etc in C??
i am currently working on a trainer/development kit for 8051..One of the commands to be executed is R<CR> Once this command is executed,the values of all the registers like A,B,SP,PSW,DPH,DPL,R0,R1,R7 should be displayed on screen...how do i retrieve these register values in C?