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144 lines
4.2 KiB
144 lines
4.2 KiB
The r Command
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r
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The r command sets or displays register values.
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Format
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The format for the r command is:
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r [reg|* [val|field val]]
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where:
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regis the name of the register or registers (specified by wildcard
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characters) to display or modify.
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valis the value to which the specified register or registers should
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be modified.
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field valis the value to which the specified field in the specified
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register should be modified.
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* displays the contents of all registers except floating-point
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registers.
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f* displays the contents of all floating-point registers.
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Invoking the r command without any parameters or arguments displays a
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list of all the general-purpose registers.
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Functional Description
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The r command sets or displays register values. The character and word
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wildcards, "*" and "?", can be used in the register name. The '?'
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character matches any single character, while the '*' character matches
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any number of any characters. This command accepts both hardware and
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software names. Examples illustrating the use of the r command
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follow.
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r Display all General-purpose registers.
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r * Display all register values.
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r 8 Display $8 (t0).
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r t0 Display t0 ($8).
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r t* Display t0 through t9.
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r epc Display EPC register.
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r epc start Set EPC register to the symbol start value.
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r 4 45 Set register 4 to 45.
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r t0 45 Set register t0 to 45.
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r sr 0 Set SR to zero.
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r sr bev 1 Set the BEV bit of SR to one.
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r epc a0020000 Set EPC to a0020000.
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r a Display the value of pseudo
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register 'a'.
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r ? Display the value of all pseudo
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registers.
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There are 26 pseudo registers (named a thru z). These can be referenced
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in the same way as real registers, and are typically used to implement
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complex breakpoint conditions (see the when
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command).
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Examples
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Display all General Purpose registers.
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PMON r
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zero at v0 v1 a0 a1 a2 a3
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$0- 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
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t0 t1 t2 t3 t4 t5 t6 t7
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$8- 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
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s0 s1 s2 s3 s4 s5 s6 s7
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$16- 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
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t8 t9 k0 k1 gp sp s8 ra
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$24- 00000000 00000000 00000000 00000000 00000000 80008b40 00000000 00000000
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Display all registers. Note that the actual registers that are
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displayed by the "r *" command depends on what type of
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processor you are using. This display was generated using a LR33000.
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PMON r *
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$0- 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
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$8- 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
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$16- 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
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$24- 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
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C0_EPC=a0020000 C0_BADADDR=00000000 C0_BPC=00000000 C0_BDA=00000000
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M_TIC1=000000 M_TIC2=000000 M_RTIC=025
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C0_SR: CU BEV TS PE CM PZ SWC ISC IM&SW KUo IEo KUp IEp KUc IEc
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0000 0 0 0 0 0 0 0 00000000 0 0 0 0 0 0
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C0_CAUSE: BD CE IP SW EXCODE
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0 0 000000 00 Int
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C0_PRID: IMP Rev
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0 0
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C0_DCIC: TR UD KD TE DW DR DAE PCE DE D I T W R DA PC DG
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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M_CFG: ICD DCD IBS DBS IW IOWAIT PW PWAIT CS PE DGE BFD RGN RPC CL DCE
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0 0 16 16 0 6 0 6 0 0 1 0 1 1 1 1
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M_TC1: CE IE INT
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0 0 0
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M_TC2: CE IE INT
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0 0 0
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Set the IEC bit of the Status Register.
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PMON r sr iec 1
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Display the Status Register.
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PMON r sr
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C0_SR: CU BEV TS PE CM PZ SWC ISC IM&SW KUo IEo KUp IEp KUc IEc
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0000 1 0 0 0 0 0 0 00000000 0 0 0 0 0 1
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You can use the ls command to display the Status
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Register as a hex value. This technique can be used for any register.
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PMON ls -v @sr
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0x00400001 = 0t4194305 = 0o20000001
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Files
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The r command is located in mon/regs.c.
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See Also
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l command
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for disassembling instructions from memory.
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