Nils Asmussen has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/25656 )
Change subject: arch-riscv: make uret,sret,mret
SerializeAfter,NonSpeculative.
......................................................................
arch-riscv: make uret,sret,mret SerializeAfter,NonSpeculative.
These instructions potentially change the privilege level, upon which
the execution of other instructions depends. For that reason, we need to
make *ret SerializeAfter and we also don't want to execute them
speculatively.
Change-Id: If3b5ba6ec3b4102d53c51cf723eba5d5da3eaa2f
---
M src/arch/riscv/isa/decoder.isa
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/arch/riscv/isa/decoder.isa b/src/arch/riscv/isa/decoder.isa
index 5de3eee..4f0a90a 100644
--- a/src/arch/riscv/isa/decoder.isa
+++ b/src/arch/riscv/isa/decoder.isa
@@ -1775,7 +1775,7 @@
status.upie = 1;
xc->setMiscReg(MISCREG_STATUS, status);
NPC = xc->readMiscReg(MISCREG_UEPC);
- }}, IsReturn);
+ }}, IsSerializeAfter, IsNonSpeculative, IsReturn);
}
0x8: decode RS2 {
0x2: sret({{
@@ -1796,7 +1796,7 @@
xc->setMiscReg(MISCREG_STATUS, status);
NPC = xc->readMiscReg(MISCREG_SEPC);
}
- }}, IsReturn);
+ }}, IsSerializeAfter, IsNonSpeculative, IsReturn);
0x5: wfi({{
STATUS status =
xc->readMiscReg(MISCREG_STATUS);
auto pm = (PrivilegeMode)xc->readMiscReg(
@@ -1835,7 +1835,7 @@
xc->setMiscReg(MISCREG_STATUS, status);
NPC = xc->readMiscReg(MISCREG_MEPC);
}
- }}, IsReturn);
+ }}, IsSerializeAfter, IsNonSpeculative, IsReturn);
}
}
format CSROp {
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: If3b5ba6ec3b4102d53c51cf723eba5d5da3eaa2f
Gerrit-Change-Number: 25656
Gerrit-PatchSet: 1
Gerrit-Owner: Nils Asmussen <nils.asmus...@barkhauseninstitut.org>
Gerrit-MessageType: newchange
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