[PULL 12/59] linux-user/sparc: Include TARGET_STACK_BIAS in get_sp_from_cpustate

[Laurent Vivier]

From: Richard Henderson <richard.hender...@linaro.org>

Move TARGET_STACK_BIAS from signal.c.  Generic code cares about the
logical stack pointer, not the physical one that has a bias applied
for sparc64.

Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
Message-Id: <20210426025334.1168495-6-richard.hender...@linaro.org>
Signed-off-by: Laurent Vivier <laur...@vivier.eu>
---
 linux-user/sparc/signal.c     | 2 --
 linux-user/sparc/target_cpu.h | 9 ++++++++-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/linux-user/sparc/signal.c b/linux-user/sparc/signal.c
index d27b7a3af79d..76579093a88c 100644
--- a/linux-user/sparc/signal.c
+++ b/linux-user/sparc/signal.c
@@ -394,8 +394,6 @@ struct target_reg_window {
     abi_ulong ins[8];
 };
 
-#define TARGET_STACK_BIAS 2047
-
 /* {set, get}context() needed for 64-bit SparcLinux userland. */
 void sparc64_set_context(CPUSPARCState *env)
 {
diff --git a/linux-user/sparc/target_cpu.h b/linux-user/sparc/target_cpu.h
index 1fa1011775a1..1f4bed50f476 100644
--- a/linux-user/sparc/target_cpu.h
+++ b/linux-user/sparc/target_cpu.h
@@ -20,6 +20,12 @@
 #ifndef SPARC_TARGET_CPU_H
 #define SPARC_TARGET_CPU_H
 
+#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
+# define TARGET_STACK_BIAS 2047
+#else
+# define TARGET_STACK_BIAS 0
+#endif
+
 static inline void cpu_clone_regs_child(CPUSPARCState *env, target_ulong newsp,
                                         unsigned flags)
 {
@@ -40,6 +46,7 @@ static inline void cpu_clone_regs_child(CPUSPARCState *env, 
target_ulong newsp,
 #endif
         /* ??? The kernel appears to copy one stack frame to the new stack. */
         /* ??? The kernel force aligns the new stack. */
+        /* Userspace provides a biased stack pointer value. */
         env->regwptr[WREG_SP] = newsp;
     }
 
@@ -77,7 +84,7 @@ static inline void cpu_set_tls(CPUSPARCState *env, 
target_ulong newtls)
 
 static inline abi_ulong get_sp_from_cpustate(CPUSPARCState *state)
 {
-    return state->regwptr[WREG_SP];
+    return state->regwptr[WREG_SP] + TARGET_STACK_BIAS;
 }
 
 #endif
-- 
2.31.1