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authorBlue Swirl <blauwirbel@gmail.com>2011-05-28 07:13:05 +0000
committerBlue Swirl <blauwirbel@gmail.com>2011-06-26 18:25:47 +0000
commit345649c054648ce5812bb2b247969d188dcb0f87 (patch)
tree864b8b8e7f7fc62f2cfad5e25a7e5d5b377133d6 /tcg/tcg.c
parentb591dc59bc98ee558db4ca512aa117748ebfdeef (diff)
downloadqemu-arm-345649c054648ce5812bb2b247969d188dcb0f87.tar.gz
TCG: remove broken stack allocation for call arguments
The code for stack allocation for call arguments is way too simplistic to actually work on targets with non-trivial stack allocation policies, e.g. ppc64. We've also already allocated TCG_STATIC_CALL_ARGS_SIZE worth of stack for calls which should be well more than any helper needs. Remove broken dynamic stack allocation code and replace it with an assert. Should dynamic stack allocation ever be needed again, target specific functions should be added. Thanks to Richard Henderson for the analysis. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Diffstat (limited to 'tcg/tcg.c')
-rw-r--r--tcg/tcg.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/tcg/tcg.c b/tcg/tcg.c
index d8bf72159f..29cd7a2729 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -1845,13 +1845,14 @@ static int tcg_reg_alloc_call(TCGContext *s, const TCGOpDef *def,
nb_regs = nb_params;
/* assign stack slots first */
- /* XXX: preallocate call stack */
call_stack_size = (nb_params - nb_regs) * sizeof(tcg_target_long);
call_stack_size = (call_stack_size + TCG_TARGET_STACK_ALIGN - 1) &
~(TCG_TARGET_STACK_ALIGN - 1);
allocate_args = (call_stack_size > TCG_STATIC_CALL_ARGS_SIZE);
if (allocate_args) {
- tcg_out_addi(s, TCG_REG_CALL_STACK, -STACK_DIR(call_stack_size));
+ /* XXX: if more than TCG_STATIC_CALL_ARGS_SIZE is needed,
+ preallocate call stack */
+ tcg_abort();
}
stack_offset = TCG_TARGET_CALL_STACK_OFFSET;
@@ -1970,10 +1971,6 @@ static int tcg_reg_alloc_call(TCGContext *s, const TCGOpDef *def,
}
tcg_out_op(s, opc, &func_arg, &const_func_arg);
-
- if (allocate_args) {
- tcg_out_addi(s, TCG_REG_CALL_STACK, STACK_DIR(call_stack_size));
- }
/* assign output registers and emit moves if needed */
for(i = 0; i < nb_oargs; i++) {