summaryrefslogtreecommitdiff
path: root/src/arch/arm/insts/static_inst.hh
diff options
context:
space:
mode:
authorGabe Black <gblack@eecs.umich.edu>2009-11-14 19:22:30 -0800
committerGabe Black <gblack@eecs.umich.edu>2009-11-14 19:22:30 -0800
commite543f162475b93a1cae7f301a7edd76067d81ba7 (patch)
tree9b17b80499d848876b7d08ceadb7d64f7e58dea6 /src/arch/arm/insts/static_inst.hh
parent812e390693253818c49585daf35692759a1c82d4 (diff)
downloadgem5-e543f162475b93a1cae7f301a7edd76067d81ba7.tar.xz
ARM: Write some functions to write to the CPSR and SPSR for instructions.
Diffstat (limited to 'src/arch/arm/insts/static_inst.hh')
-rw-r--r--src/arch/arm/insts/static_inst.hh50
1 files changed, 50 insertions, 0 deletions
diff --git a/src/arch/arm/insts/static_inst.hh b/src/arch/arm/insts/static_inst.hh
index c963c1827..f2881c3b6 100644
--- a/src/arch/arm/insts/static_inst.hh
+++ b/src/arch/arm/insts/static_inst.hh
@@ -74,6 +74,56 @@ class ArmStaticInst : public StaticInst
void printDataInst(std::ostream &os, bool withImm) const;
std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
+
+ static uint32_t
+ cpsrWriteByInstr(CPSR cpsr, uint32_t val,
+ uint8_t byteMask, bool affectState)
+ {
+ bool privileged = (cpsr.mode != MODE_USER);
+
+ uint32_t bitMask = 0;
+
+ if (bits(byteMask, 3)) {
+ unsigned lowIdx = affectState ? 24 : 27;
+ bitMask = bitMask | mask(31, lowIdx);
+ }
+ if (bits(byteMask, 2)) {
+ bitMask = bitMask | mask(19, 16);
+ }
+ if (bits(byteMask, 1)) {
+ unsigned highIdx = affectState ? 15 : 9;
+ unsigned lowIdx = privileged ? 8 : 9;
+ bitMask = bitMask | mask(highIdx, lowIdx);
+ }
+ if (bits(byteMask, 0)) {
+ if (privileged) {
+ bitMask = bitMask | mask(7, 6);
+ bitMask = bitMask | mask(5);
+ }
+ if (affectState)
+ bitMask = bitMask | (1 << 5);
+ }
+
+ return ((uint32_t)cpsr & ~bitMask) | (val & bitMask);
+ }
+
+ static uint32_t
+ spsrWriteByInstr(uint32_t spsr, uint32_t val,
+ uint8_t byteMask, bool affectState)
+ {
+ uint32_t bitMask = 0;
+
+ if (bits(byteMask, 3))
+ bitMask = bitMask | mask(31, 24);
+ if (bits(byteMask, 2))
+ bitMask = bitMask | mask(19, 16);
+ if (bits(byteMask, 1))
+ bitMask = bitMask | mask(15, 8);
+ if (bits(byteMask, 0))
+ bitMask = bitMask | mask(7, 0);
+
+ return ((spsr & ~bitMask) | (val & bitMask));
+ }
};
}