syscall-emul: Move memState into its own file

The Process class is full of implementation details and
structures related to SE Mode. This changeset factors out an
internal class from Process and moves it into a separate file.
The purpose behind doing this is to clean up the code and make
it a bit more modular.

Change-Id: Ic6941a1657751e8d51d5b6b1dcc04f1195884280
Reviewed-on: https://gem5-review.googlesource.com/2263
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

1 files changed, 23 insertions, 17 deletions

diff --git a/src/arch/power/process.cc b/src/arch/power/process.cc
index 5a32218ef..4b2efb0a6 100644
--- a/src/arch/power/process.cc
+++ b/src/arch/power/process.cc
@@ -51,18 +51,23 @@ using namespace PowerISA;
 PowerProcess::PowerProcess(ProcessParams *params, ObjectFile *objFile)
     : Process(params, objFile)
 {
-    memState->stackBase = 0xbf000000L;
+    // Set up break point (Top of Heap)
+    Addr brk_point = objFile->dataBase() + objFile->dataSize() +
+                     objFile->bssSize();
+    brk_point = roundUp(brk_point, PageBytes);
 
-    // Set pointer for next thread stack.  Reserve 8M for main stack.
-    memState->nextThreadStackBase = memState->stackBase - (8 * 1024 * 1024);
+    Addr stack_base = 0xbf000000L;
 
-    // Set up break point (Top of Heap)
-    memState->brkPoint = objFile->dataBase() + objFile->dataSize() +
-                         objFile->bssSize();
-    memState->brkPoint = roundUp(memState->brkPoint, PageBytes);
+    Addr max_stack_size = 8 * 1024 * 1024;
+
+    // Set pointer for next thread stack.  Reserve 8M for main stack.
+    Addr next_thread_stack_base = stack_base - max_stack_size;
 
     // Set up region for mmaps. For now, start at bottom of kuseg space.
-    memState->mmapEnd = 0x70000000L;
+    Addr mmap_end = 0x70000000L;
+
+    memState = make_shared<MemState>(brk_point, stack_base, max_stack_size,
+                                     next_thread_stack_base, mmap_end);
 }
 
 void
@@ -186,16 +191,17 @@ PowerProcess::argsInit(int intSize, int pageSize)
 
     int space_needed = frame_size + aux_padding;
 
-    memState->stackMin = memState->stackBase - space_needed;
-    memState->stackMin = roundDown(memState->stackMin, align);
-    memState->stackSize = memState->stackBase - memState->stackMin;
+    Addr stack_min = memState->getStackBase() - space_needed;
+    stack_min = roundDown(stack_min, align);
+
+    memState->setStackSize(memState->getStackBase() - stack_min);
 
     // map memory
-    allocateMem(roundDown(memState->stackMin, pageSize),
-                roundUp(memState->stackSize, pageSize));
+    allocateMem(roundDown(stack_min, pageSize),
+                roundUp(memState->getStackSize(), pageSize));
 
     // map out initial stack contents
-    uint32_t sentry_base = memState->stackBase - sentry_size;
+    uint32_t sentry_base = memState->getStackBase() - sentry_size;
     uint32_t aux_data_base = sentry_base - aux_data_size;
     uint32_t env_data_base = aux_data_base - env_data_size;
     uint32_t arg_data_base = env_data_base - arg_data_size;
@@ -214,7 +220,7 @@ PowerProcess::argsInit(int intSize, int pageSize)
     DPRINTF(Stack, "0x%x - envp array\n", envp_array_base);
     DPRINTF(Stack, "0x%x - argv array\n", argv_array_base);
     DPRINTF(Stack, "0x%x - argc \n", argc_base);
-    DPRINTF(Stack, "0x%x - stack min\n", memState->stackMin);
+    DPRINTF(Stack, "0x%x - stack min\n", stack_min);
 
     // write contents to stack
 
@@ -259,12 +265,12 @@ PowerProcess::argsInit(int intSize, int pageSize)
     ThreadContext *tc = system->getThreadContext(contextIds[0]);
 
     //Set the stack pointer register
-    tc->setIntReg(StackPointerReg, memState->stackMin);
+    tc->setIntReg(StackPointerReg, stack_min);
 
     tc->pcState(getStartPC());
 
     //Align the "stack_min" to a page boundary.
-    memState->stackMin = roundDown(memState->stackMin, pageSize);
+    memState->setStackMin(roundDown(stack_min, pageSize));
 }
 
 PowerISA::IntReg