From: Alec Roelke <ar4jc@virginia.edu>
Date: Fri, 5 Jan 2018 00:04:43 +0000 (-0500)
Subject: arch-riscv: Correct syscall argument reg count
X-Git-Tag: v19.0.0.0~2406
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b001475a1ff5d4693f4d8b9063b3d602f7dd8043;p=gem5.git

arch-riscv: Correct syscall argument reg count

As per the discussion in patch #6904 and the Linux 4.15 kernel code for
RISC-V, RISC-V has 7 system call argument registers, x10 through x16 (a0
through a6), with x17 (a7) being used for the system call number.

Change-Id: I0080eca78ffa844b322bb2cff2a51ab2815f3809
Reviewed-on: https://gem5-review.googlesource.com/7081
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Tuan Ta <qtt2@cornell.edu>
Maintainer: Alec Roelke <ar4jc@virginia.edu>
---

diff --git a/src/arch/riscv/registers.hh b/src/arch/riscv/registers.hh
index 01e385957..a61554c13 100644
--- a/src/arch/riscv/registers.hh
+++ b/src/arch/riscv/registers.hh
@@ -97,6 +97,10 @@ const std::vector<int> ReturnValueRegs = {10, 11};
 const std::vector<int> ArgumentRegs = {10, 11, 12, 13, 14, 15, 16, 17};
 const int AMOTempReg = 32;
 
+const int SyscallPseudoReturnReg = 10;
+const std::vector<int> SyscallArgumentRegs = {10, 11, 12, 13, 14, 15, 16};
+const int SyscallNumReg = 17;
+
 const std::vector<std::string> IntRegNames = {
     "zero", "ra", "sp", "gp",
     "tp", "t0", "t1", "t2",
@@ -118,10 +122,6 @@ const std::vector<std::string> FloatRegNames = {
     "ft8", "ft9", "ft10", "ft11"
 };
 
-const int SyscallNumReg = 17;
-const std::vector<int> SyscallArgumentRegs = {10, 11, 12, 13};
-const int SyscallPseudoReturnReg = 10;
-
 enum MiscRegIndex {
     MISCREG_USTATUS = 0x000,
     MISCREG_UIE = 0x004,