[PULL 01/46] semihosting: Retrieve stack top from image_info

[Richard Henderson <richard.henderson@linaro.org>]

Remove the write-once field TaskState.stack_base, and use the
same value from struct image_info.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/qemu.h             | 1 -
 linux-user/aarch64/cpu_loop.c | 1 -
 linux-user/arm/cpu_loop.c     | 1 -
 linux-user/m68k/cpu_loop.c    | 1 -
 linux-user/riscv/cpu_loop.c   | 1 -
 semihosting/arm-compat-semi.c | 6 +++++-
 6 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 0b19fa43e6..b6621536b3 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -127,7 +127,6 @@ struct TaskState {
     abi_ulong heap_base;
     abi_ulong heap_limit;
 #endif
-    abi_ulong stack_base;
     int used; /* non zero if used */
     struct image_info *info;
     struct linux_binprm *bprm;
diff --git a/linux-user/aarch64/cpu_loop.c b/linux-user/aarch64/cpu_loop.c
index fea43cefa6..b65999a75b 100644
--- a/linux-user/aarch64/cpu_loop.c
+++ b/linux-user/aarch64/cpu_loop.c
@@ -168,7 +168,6 @@ void target_cpu_copy_regs(CPUArchState *env, target_pt_regs *regs)
         qemu_guest_getrandom_nofail(&env->keys, sizeof(env->keys));
     }
 
-    ts->stack_base = info->start_stack;
     ts->heap_base = info->brk;
     /* This will be filled in on the first SYS_HEAPINFO call.  */
     ts->heap_limit = 0;
diff --git a/linux-user/arm/cpu_loop.c b/linux-user/arm/cpu_loop.c
index 33f63951a9..e40d6beafa 100644
--- a/linux-user/arm/cpu_loop.c
+++ b/linux-user/arm/cpu_loop.c
@@ -504,7 +504,6 @@ void target_cpu_copy_regs(CPUArchState *env, target_pt_regs *regs)
     arm_rebuild_hflags(env);
 #endif
 
-    ts->stack_base = info->start_stack;
     ts->heap_base = info->brk;
     /* This will be filled in on the first SYS_HEAPINFO call.  */
     ts->heap_limit = 0;
diff --git a/linux-user/m68k/cpu_loop.c b/linux-user/m68k/cpu_loop.c
index 5da91b997a..3aaaf02ca4 100644
--- a/linux-user/m68k/cpu_loop.c
+++ b/linux-user/m68k/cpu_loop.c
@@ -117,7 +117,6 @@ void target_cpu_copy_regs(CPUArchState *env, target_pt_regs *regs)
     env->aregs[7] = regs->usp;
     env->sr = regs->sr;
 
-    ts->stack_base = info->start_stack;
     ts->heap_base = info->brk;
     /* This will be filled in on the first SYS_HEAPINFO call.  */
     ts->heap_limit = 0;
diff --git a/linux-user/riscv/cpu_loop.c b/linux-user/riscv/cpu_loop.c
index 3ac8bbfec1..541de765ff 100644
--- a/linux-user/riscv/cpu_loop.c
+++ b/linux-user/riscv/cpu_loop.c
@@ -109,7 +109,6 @@ void target_cpu_copy_regs(CPUArchState *env, target_pt_regs *regs)
         exit(EXIT_FAILURE);
     }
 
-    ts->stack_base = info->start_stack;
     ts->heap_base = info->brk;
     /* This will be filled in on the first SYS_HEAPINFO call.  */
     ts->heap_limit = 0;
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 86e5260e50..bc04b02eba 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -696,7 +696,11 @@ void do_common_semihosting(CPUState *cs)
 
             retvals[0] = ts->heap_base;
             retvals[1] = ts->heap_limit;
-            retvals[2] = ts->stack_base;
+            /*
+             * Note that semihosting is *not* thread aware.
+             * Always return the stack base of the main thread.
+             */
+            retvals[2] = ts->info->start_stack;
             retvals[3] = 0; /* Stack limit.  */
 #else
             retvals[0] = info.heapbase;  /* Heap Base */
-- 
2.43.0