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authorGabe Black <gblack@eecs.umich.edu>2010-06-02 12:58:11 -0500
committerGabe Black <gblack@eecs.umich.edu>2010-06-02 12:58:11 -0500
commiteb1447302d03f1cbd88870f185310eef3f2db054 (patch)
treed082b47b115697b969ffe622bc740d3b2fedbe0e /src/arch
parentbb6fea91da7c5436d26d6b93f22b2dd5cd6287ba (diff)
downloadgem5-eb1447302d03f1cbd88870f185310eef3f2db054.tar.xz
ARM: Decode the SRS instruction.
Diffstat (limited to 'src/arch')
-rw-r--r--src/arch/arm/isa/formats/mem.isa25
-rw-r--r--src/arch/arm/isa/formats/uncond.isa39
2 files changed, 58 insertions, 6 deletions
diff --git a/src/arch/arm/isa/formats/mem.isa b/src/arch/arm/isa/formats/mem.isa
index 15a4a5c4f..aa8bbf55e 100644
--- a/src/arch/arm/isa/formats/mem.isa
+++ b/src/arch/arm/isa/formats/mem.isa
@@ -263,10 +263,10 @@ def format ArmSyncMem() {{
def format Thumb32SrsRfe() {{
decode_block = '''
{
+ const bool wb = (bits(machInst, 21) == 1);
+ const bool add = (bits(machInst, 24, 23) == 0x3);
if (bits(machInst, 20) == 1) {
- const bool add = (bits(machInst, 24, 23) == 0x3);
// post == add
- const bool wb = (bits(machInst, 21) == 1);
const IntRegIndex rn =
(IntRegIndex)(uint32_t)bits(machInst, 19, 16);
if (!add && !wb) {
@@ -279,14 +279,31 @@ def format Thumb32SrsRfe() {{
return new %(rfe_uw)s(machInst, rn, RfeOp::IncrementAfter, wb);
}
} else {
- return new WarnUnimplemented("srs", machInst);
+ const uint32_t mode = bits(machInst, 4, 0);
+ if (!add && !wb) {
+ return new %(srs)s(machInst, mode,
+ SrsOp::DecrementBefore, wb);
+ } else if (add && !wb) {
+ return new %(srs_u)s(machInst, mode,
+ SrsOp::IncrementAfter, wb);
+ } else if (!add && wb) {
+ return new %(srs_w)s(machInst, mode,
+ SrsOp::DecrementBefore, wb);
+ } else {
+ return new %(srs_uw)s(machInst, mode,
+ SrsOp::IncrementAfter, wb);
+ }
}
}
''' % {
"rfe" : "RFE_" + loadImmClassName(False, False, False, 8),
"rfe_u" : "RFE_" + loadImmClassName(True, True, False, 8),
"rfe_w" : "RFE_" + loadImmClassName(False, False, True, 8),
- "rfe_uw" : "RFE_" + loadImmClassName(True, True, True, 8)
+ "rfe_uw" : "RFE_" + loadImmClassName(True, True, True, 8),
+ "srs" : "SRS_" + storeImmClassName(False, False, False, 8),
+ "srs_u" : "SRS_" + storeImmClassName(True, True, False, 8),
+ "srs_w" : "SRS_" + storeImmClassName(False, False, True, 8),
+ "srs_uw" : "SRS_" + storeImmClassName(True, True, True, 8)
}
}};
diff --git a/src/arch/arm/isa/formats/uncond.isa b/src/arch/arm/isa/formats/uncond.isa
index fd2f66e75..45cdbd058 100644
--- a/src/arch/arm/isa/formats/uncond.isa
+++ b/src/arch/arm/isa/formats/uncond.isa
@@ -163,7 +163,34 @@ def format ArmUnconditional() {{
{
const uint32_t val = ((machInst >> 20) & 0x5);
if (val == 0x4) {
- return new WarnUnimplemented("srs", machInst);
+ const uint32_t mode = bits(machInst, 4, 0);
+ switch (bits(machInst, 24, 21)) {
+ case 0x2:
+ return new %(srs)s(machInst, mode,
+ SrsOp::DecrementAfter, false);
+ case 0x3:
+ return new %(srs_w)s(machInst, mode,
+ SrsOp::DecrementAfter, true);
+ case 0x6:
+ return new %(srs_u)s(machInst, mode,
+ SrsOp::IncrementAfter, false);
+ case 0x7:
+ return new %(srs_uw)s(machInst, mode,
+ SrsOp::IncrementAfter, true);
+ case 0xa:
+ return new %(srs_p)s(machInst, mode,
+ SrsOp::DecrementBefore, false);
+ case 0xb:
+ return new %(srs_pw)s(machInst, mode,
+ SrsOp::DecrementBefore, true);
+ case 0xe:
+ return new %(srs_pu)s(machInst, mode,
+ SrsOp::IncrementBefore, false);
+ case 0xf:
+ return new %(srs_puw)s(machInst, mode,
+ SrsOp::IncrementBefore, true);
+ }
+ return new Unknown(machInst);
} else if (val == 0x1) {
switch (bits(machInst, 24, 21)) {
case 0x0:
@@ -266,6 +293,14 @@ def format ArmUnconditional() {{
"rfe_p" : "RFE_" + loadImmClassName(False, False, False, 8),
"rfe_pw" : "RFE_" + loadImmClassName(False, False, True, 8),
"rfe_pu" : "RFE_" + loadImmClassName(False, True, False, 8),
- "rfe_puw" : "RFE_" + loadImmClassName(False, True, True, 8)
+ "rfe_puw" : "RFE_" + loadImmClassName(False, True, True, 8),
+ "srs" : "SRS_" + storeImmClassName(True, False, False, 8),
+ "srs_w" : "SRS_" + storeImmClassName(True, False, True, 8),
+ "srs_u" : "SRS_" + storeImmClassName(True, True, False, 8),
+ "srs_uw" : "SRS_" + storeImmClassName(True, True, True, 8),
+ "srs_p" : "SRS_" + storeImmClassName(False, False, False, 8),
+ "srs_pw" : "SRS_" + storeImmClassName(False, False, True, 8),
+ "srs_pu" : "SRS_" + storeImmClassName(False, True, False, 8),
+ "srs_puw" : "SRS_" + storeImmClassName(False, True, True, 8)
};
}};