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powerpc: Separate out load/store emulation into its own function

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This moves the parts of emulate_step() that deal with emulating
load and store instructions into a new function called
emulate_loadstore().  This is to make it possible to reuse this
code in the alignment handler.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Paul Mackerras
2017-08-30 14:12:39 +10:00
committed by Michael Ellerman
parent d955189ae4
commit a53d5182e2
2 changed files with 273 additions and 232 deletions
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9
arch/powerpc/include/asm/sstep.h
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@@ -152,6 +152,15 @@ void emulate_update_regs(struct pt_regs *reg, struct instruction_op *op);
*/
extern int emulate_step(struct pt_regs *regs, unsigned int instr);
/*
* Emulate a load or store instruction by reading/writing the
* memory of the current process. FP/VMX/VSX registers are assumed
* to hold live values if the appropriate enable bit in regs->msr is
* set; otherwise this will use the saved values in the thread struct
* for user-mode accesses.
*/
extern int emulate_loadstore(struct pt_regs *regs, struct instruction_op *op);
extern void emulate_vsx_load(struct instruction_op *op, union vsx_reg *reg,
const void *mem, bool cross_endian);
extern void emulate_vsx_store(struct instruction_op *op,