[Qemu-devel] [PATCH 1/4] linux-user: Correct AUXV Cache Line Sizes for PowerPC

[Tom Musta <tommusta@gmail.com>]

Set the AT_ICACHEBSIZE and AT_DCACHEBSIZE entries of the AUXV to match the
CPU model's cache line sizes.  This fixes memory clobbering problems on more
recent Book 3s implementations; memset(p, 0, N) will use the dcbz instruction
when N is sufficiently large and many of the newer server CPUs have cache lines
sizes of 128 bytes.

Signed-off-by: Tom Musta <tommusta@gmail.com>
---
 linux-user/elfload.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 127c565..9a32899 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -767,8 +767,9 @@ static uint32_t get_elf_hwcap(void)
 #define DLINFO_ARCH_ITEMS       5
 #define ARCH_DLINFO                                     \
     do {                                                \
-        NEW_AUX_ENT(AT_DCACHEBSIZE, 0x20);              \
-        NEW_AUX_ENT(AT_ICACHEBSIZE, 0x20);              \
+        PowerPCCPU *cpu = POWERPC_CPU(thread_cpu);              \
+        NEW_AUX_ENT(AT_DCACHEBSIZE, cpu->env.dcache_line_size); \
+        NEW_AUX_ENT(AT_ICACHEBSIZE, cpu->env.icache_line_size); \
         NEW_AUX_ENT(AT_UCACHEBSIZE, 0);                 \
         /*                                              \
          * Now handle glibc compatibility.              \
-- 
1.7.1