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powerpc registers
powerpc opcodes
powerpc assembly language beginners guide
stw instruction
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powerpc instruction set architecture
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powerpc assembly language reference
7 Jan 2009 This section describes the conventions used to specify addressing modes and instruction mnemonics for the PowerPC series processor architecture. lwz treats the sign-extended low 16 bits as a displacement, adding it to the contents of register 2 to get a 32-bit address, and then loads the word at that
Note: The eieio instruction is supported only in the PowerPC® architecture. PowerPC®. eieio. Description. The eieio instruction provides an ordering function that ensures that all load and store instructions initiated prior to the eieio instruction complete in main lwz r4,AA(r1) stw r4,BB(r1) eieio lwz r5,CC(r1) stw r5,DD(r1).
PowerPC® The lwz and l instructions load a word in storage from a specified location in memory addressed by the effective address (EA) into the target general-purpose register (GPR) RT. The lwz and l instructions have one syntax form and do not affect the Fixed-Point Exception Register or Condition Register Field 0.
such information as the level(s) of the PowerPC architecture in which the instruction may .. PowerPC user instruction set architecture. VEA. PowerPC .. lis. rD,value equivalent to addis rD,0,value subis rD,rA,value equivalent to addis rD,rA,–value. PowerPC Architecture Level. Supervisor Level. Optional. Form. UISA. D. 0.
The lwz instruction (load word and zero) loads a word (32-bit value), and if we are using 64-bit registers, zeroes out the highest 32 bits. The main function at this point is hopefully largely obvious, with the exception of the lis and ori functions. Since PowerPC instructions (even on 64-bit PowerPCs) are all 32 bits in length,
Table 1. PowerPC® Instructions . lwz, Load Word and Zero, D, 32. lwzu, Load Word with Zero Update, D, 33. lwzux, Load . stw, Store, D, 36. stwbrx, Store Word Byte-Reversed Indexed, X, 31, 662. stwcx. Store Word Conditional Indexed, X, 31, 150. stwu, Store Word with Update, D, 37. stwux, Store Word with Update
1. not allowed for byte loads (use extsb instruction). 2. illegal for word loads on 32-bit implementations. • Update mode. e.g.: lwzu r4, 1(r3). EA < (r3) + 1 r4 < MEM(EA, 4) r3 < EA. Load/Store Miscellany. • Unaligned accesses are OK, but slower than aligned. • PowerPC is big-endian. • Summary: lbz lhz lha lwz stb sth stw.
Note that these descriptions are taken from the 64-bit version of the instruction set; bit numbering are different for some instructions on 32-bit implementations. The lab course software uses a 32-bit PowerPC emulator. The mnemonics column shows addis, addis / lis / subis, Add Immediate Shifted. addme, addme / addme.
Unlike x86, these are the *only* instructions that access memory; you can't do an "add" with one operand in memory! lwz r3, 0(r1) ; load register r3 from the stack blr. (Try this in NetRun now!) Here I'm writing an integer out to the stack, then reading it in again. li r7, 123 stw r7, 0(r1) ; store register r7 to the stack lwz r3, 0(r1)
Prologue stwu r1,-16(r1) ; "push" mflr r0 ; r0 = link register stw r0,20(r1) ; Save link register ; Body of subroutine: addi r3, r3, 1 ; Epilogue lwz r0,20(r1) mtlr r0 addi r1, r1, 16 ; "pop" The IBM 32-Bit PowerPC Programming Environment gives all the instructions in chapter 8.1 and a good overview in chapter 4. The IBM Compiler
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