[Qemu-devel] [PATCH 7/15] Extend mem_write_* to mem_access_*

[Jan Kiszka <jan.kiszka@siemens.com>]

For full read-watchpoint support, it is required to keep track of the
accessed vaddr as well as the accessing pc also for read operations.
This patch extends the use of mem_write_pc/vaddr to mem_access_pc/vaddr
therefore.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 cpu-defs.h         |    8 ++++----
 exec.c             |   18 +++++++++---------
 softmmu_template.h |   15 ++++++++++-----
 3 files changed, 23 insertions(+), 18 deletions(-)

Index: b/cpu-defs.h
===================================================================
--- a/cpu-defs.h
+++ b/cpu-defs.h
@@ -148,10 +148,10 @@ typedef struct CPUWatchpoint {
     /* in order to avoid passing too many arguments to the memory       \
        write helpers, we store some rarely used information in the CPU  \
        context) */                                                      \
-    unsigned long mem_write_pc; /* host pc at which the memory was      \
-                                   written */                           \
-    target_ulong mem_write_vaddr; /* target virtual addr at which the   \
-                                     memory was written */              \
+    unsigned long mem_access_pc; /* host pc at which the memory was     \
+                                    accessed */                         \
+    target_ulong mem_access_vaddr; /* target virtual addr at which the  \
+                                      memory was accessed */            \
     int halted; /* TRUE if the CPU is in suspend state */               \
     /* The meaning of the MMU modes is defined in the target code. */   \
     CPUTLBEntry tlb_table[NB_MMU_MODES][CPU_TLB_SIZE];                  \
Index: b/exec.c
===================================================================
--- a/exec.c
+++ b/exec.c
@@ -794,9 +794,9 @@ void tb_invalidate_phys_page_range(targe
             if (current_tb_not_found) {
                 current_tb_not_found = 0;
                 current_tb = NULL;
-                if (env->mem_write_pc) {
+                if (env->mem_access_pc) {
                     /* now we have a real cpu fault */
-                    current_tb = tb_find_pc(env->mem_write_pc);
+                    current_tb = tb_find_pc(env->mem_access_pc);
                 }
             }
             if (current_tb == tb &&
@@ -809,7 +809,7 @@ void tb_invalidate_phys_page_range(targe
 
                 current_tb_modified = 1;
                 cpu_restore_state(current_tb, env,
-                                  env->mem_write_pc, NULL);
+                                  env->mem_access_pc, NULL);
             }
 #endif /* TARGET_HAS_PRECISE_SMC */
             /* we need to do that to handle the case where a signal
@@ -833,7 +833,7 @@ void tb_invalidate_phys_page_range(targe
     if (!p->first_tb) {
         invalidate_page_bitmap(p);
         if (is_cpu_write_access) {
-            tlb_unprotect_code_phys(env, start, env->mem_write_vaddr);
+            tlb_unprotect_code_phys(env, start, env->mem_access_vaddr);
         }
     }
 #endif
@@ -858,7 +858,7 @@ static inline void tb_invalidate_phys_pa
     if (1) {
         if (loglevel) {
             fprintf(logfile, "modifying code at 0x%x size=%d EIP=%x PC=%08x\n",
-                   cpu_single_env->mem_write_vaddr, len,
+                   cpu_single_env->mem_access_vaddr, len,
                    cpu_single_env->eip,
                    cpu_single_env->eip + (long)cpu_single_env->segs[R_CS].base);
         }
@@ -2207,7 +2207,7 @@ static void notdirty_mem_writeb(void *op
     /* we remove the notdirty callback only if the code has been
        flushed */
     if (dirty_flags == 0xff)
-        tlb_set_dirty(cpu_single_env, cpu_single_env->mem_write_vaddr);
+        tlb_set_dirty(cpu_single_env, cpu_single_env->mem_access_vaddr);
 }
 
 static void notdirty_mem_writew(void *opaque, target_phys_addr_t ram_addr,
@@ -2232,7 +2232,7 @@ static void notdirty_mem_writew(void *op
     /* we remove the notdirty callback only if the code has been
        flushed */
     if (dirty_flags == 0xff)
-        tlb_set_dirty(cpu_single_env, cpu_single_env->mem_write_vaddr);
+        tlb_set_dirty(cpu_single_env, cpu_single_env->mem_access_vaddr);
 }
 
 static void notdirty_mem_writel(void *opaque, target_phys_addr_t ram_addr,
@@ -2257,7 +2257,7 @@ static void notdirty_mem_writel(void *op
     /* we remove the notdirty callback only if the code has been
        flushed */
     if (dirty_flags == 0xff)
-        tlb_set_dirty(cpu_single_env, cpu_single_env->mem_write_vaddr);
+        tlb_set_dirty(cpu_single_env, cpu_single_env->mem_access_vaddr);
 }
 
 static CPUReadMemoryFunc *error_mem_read[3] = {
@@ -2279,7 +2279,7 @@ static void check_watchpoint(int offset,
     target_ulong vaddr;
     CPUWatchpoint *wp;
 
-    vaddr = (env->mem_write_vaddr & TARGET_PAGE_MASK) + offset;
+    vaddr = (env->mem_access_vaddr & TARGET_PAGE_MASK) + offset;
     for (wp = env->watchpoints; wp != NULL; wp = wp->next) {
         if (vaddr == wp->vaddr && (wp->flags & flags)) {
             env->watchpoint_hit = wp;
Index: b/softmmu_template.h
===================================================================
--- a/softmmu_template.h
+++ b/softmmu_template.h
@@ -51,13 +51,16 @@ static DATA_TYPE glue(glue(slow_ld, SUFF
                                                         int mmu_idx,
                                                         void *retaddr);
 static inline DATA_TYPE glue(io_read, SUFFIX)(target_phys_addr_t physaddr,
-                                              target_ulong addr)
+                                              target_ulong addr,
+                                              void *retaddr)
 {
     DATA_TYPE res;
     int index;
     index = (physaddr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
     physaddr = (physaddr & TARGET_PAGE_MASK) + addr;
 
+    env->mem_access_vaddr = addr;
+    env->mem_access_pc = (unsigned long)retaddr;
 #if SHIFT <= 2
     res = io_mem_read[index][SHIFT](io_mem_opaque[index], physaddr);
 #else
@@ -96,7 +99,8 @@ DATA_TYPE REGPARM glue(glue(__ld, SUFFIX
             if ((addr & (DATA_SIZE - 1)) != 0)
                 goto do_unaligned_access;
             addend = env->iotlb[mmu_idx][index];
-            res = glue(io_read, SUFFIX)(addend, addr);
+            retaddr = GETPC();
+            res = glue(io_read, SUFFIX)(addend, addr, retaddr);
         } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
             /* slow unaligned access (it spans two pages or IO) */
         do_unaligned_access:
@@ -149,7 +153,8 @@ static DATA_TYPE glue(glue(slow_ld, SUFF
             if ((addr & (DATA_SIZE - 1)) != 0)
                 goto do_unaligned_access;
             addend = env->iotlb[mmu_idx][index];
-            res = glue(io_read, SUFFIX)(addend, addr);
+            retaddr = GETPC();
+            res = glue(io_read, SUFFIX)(addend, addr, retaddr);
         } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
         do_unaligned_access:
             /* slow unaligned access (it spans two pages) */
@@ -195,8 +200,8 @@ static inline void glue(io_write, SUFFIX
     index = (physaddr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
     physaddr = (physaddr & TARGET_PAGE_MASK) + addr;
 
-    env->mem_write_vaddr = addr;
-    env->mem_write_pc = (unsigned long)retaddr;
+    env->mem_access_vaddr = addr;
+    env->mem_access_pc = (unsigned long)retaddr;
 #if SHIFT <= 2
     io_mem_write[index][SHIFT](io_mem_opaque[index], physaddr, val);
 #else