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[v3,30/30] linux-user/sh4: Reduce TARGET_VIRT_ADDR_SPACE_BITS to 31

Message ID 20170718200255.31647-31-rth@twiddle.net (mailing list archive)
State New, archived
Headers show

Commit Message

Richard Henderson July 18, 2017, 8:02 p.m. UTC 
The real kernel has TASK_SIZE as 0x7c000000, due to quirks with
a couple of SH parts.  But nominally user-space is limited to 2GB.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 target/sh4/cpu.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
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Patch

diff --git a/target/sh4/cpu.h b/target/sh4/cpu.h
index e3abb6a..3121d1e 100644
--- a/target/sh4/cpu.h
+++ b/target/sh4/cpu.h
@@ -45,7 +45,11 @@ 
 #define TARGET_PAGE_BITS 12	/* 4k XXXXX */
 
 #define TARGET_PHYS_ADDR_SPACE_BITS 32
-#define TARGET_VIRT_ADDR_SPACE_BITS 32
+#ifdef CONFIG_USER_ONLY
+# define TARGET_VIRT_ADDR_SPACE_BITS 31
+#else
+# define TARGET_VIRT_ADDR_SPACE_BITS 32
+#endif
 
 #define SR_MD 30
 #define SR_RB 29