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SH7785 Datasheet(PDF) 136 Page - Renesas Technology Corp |
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SH7785 Datasheet(HTML) 136 Page - Renesas Technology Corp |
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136 / 1692 page  5. Exception Handling Rev.1.00 Jan. 10, 2008 Page 106 of 1658 REJ09B0261-0100 (3) Initial Page Write Exception • Source: TLB is hit in a store access, but dirty bit D = 0 • Transition address: VBR + H'00000100 • Transition operations: The virtual address (32 bits) at which this exception occurred is set in TEA, and the corresponding virtual page number (22 bits) is set in PTEH [31:10]. ASID in PTEH indicates the ASID when this exception occurred. The PC and SR contents for the instruction at which this exception occurred are saved in SPC and SSR. The R15 contents at this time are saved in SGR. Exception code H'080 is set in EXPEVT. The BL, MD, and RB bits are set to 1 in SR, and a branch is made to PC = VBR + H'0100. Initial_write_exception() { TEA = EXCEPTION_ADDRESS; PTEH.VPN = PAGE_NUMBER; SPC = PC; SSR = SR; SGR = R15; EXPEVT = H'0000 0080; SR.MD = 1; SR.RB = 1; SR.BL = 1; PC = VBR + H'0000 0100; } |
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