diff mbox series

[v4,23/57] tcg/ppc: Use full load/store helpers in user-only mode

Message ID 20230503070656.1746170-24-richard.henderson@linaro.org
State Superseded
Headers show
Series tcg: Improve atomicity support | expand

Commit Message

Richard Henderson May 3, 2023, 7:06 a.m. UTC 
Instead of using helper_unaligned_{ld,st}, use the full load/store helpers.
This will allow the fast path to increase alignment to implement atomicity
while not immediately raising an alignment exception.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/ppc/tcg-target.c.inc | 44 ----------------------------------------
 1 file changed, 44 deletions(-)

Comments

Peter Maydell May 5, 2023, 12:07 p.m. UTC | #1 
On Wed, 3 May 2023 at 08:11, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> Instead of using helper_unaligned_{ld,st}, use the full load/store helpers.
> This will allow the fast path to increase alignment to implement atomicity
> while not immediately raising an alignment exception.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  tcg/ppc/tcg-target.c.inc | 44 ----------------------------------------
>  1 file changed, 44 deletions(-)
>

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM
diff mbox series

Patch

diff --git a/tcg/ppc/tcg-target.c.inc b/tcg/ppc/tcg-target.c.inc
index 0963156a78..733f67c7a5 100644
--- a/tcg/ppc/tcg-target.c.inc
+++ b/tcg/ppc/tcg-target.c.inc
@@ -1962,7 +1962,6 @@  static const uint32_t qemu_stx_opc[(MO_SIZE + MO_BSWAP) + 1] = {
     [MO_BSWAP | MO_UQ] = STDBRX,
 };
 
-#if defined (CONFIG_SOFTMMU)
 static TCGReg ldst_ra_gen(TCGContext *s, const TCGLabelQemuLdst *l, int arg)
 {
     if (arg < 0) {
@@ -2012,49 +2011,6 @@  static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
     tcg_out_b(s, 0, lb->raddr);
     return true;
 }
-#else
-static bool tcg_out_fail_alignment(TCGContext *s, TCGLabelQemuLdst *l)
-{
-    if (!reloc_pc14(l->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
-        return false;
-    }
-
-    if (TCG_TARGET_REG_BITS < TARGET_LONG_BITS) {
-        TCGReg arg = TCG_REG_R4;
-
-        arg |= (TCG_TARGET_CALL_ARG_I64 == TCG_CALL_ARG_EVEN);
-        if (l->addrlo_reg != arg) {
-            tcg_out_mov(s, TCG_TYPE_I32, arg, l->addrhi_reg);
-            tcg_out_mov(s, TCG_TYPE_I32, arg + 1, l->addrlo_reg);
-        } else if (l->addrhi_reg != arg + 1) {
-            tcg_out_mov(s, TCG_TYPE_I32, arg + 1, l->addrlo_reg);
-            tcg_out_mov(s, TCG_TYPE_I32, arg, l->addrhi_reg);
-        } else {
-            tcg_out_mov(s, TCG_TYPE_I32, TCG_REG_R0, arg);
-            tcg_out_mov(s, TCG_TYPE_I32, arg, arg + 1);
-            tcg_out_mov(s, TCG_TYPE_I32, arg + 1, TCG_REG_R0);
-        }
-    } else {
-        tcg_out_mov(s, TCG_TYPE_TL, TCG_REG_R4, l->addrlo_reg);
-    }
-    tcg_out_mov(s, TCG_TYPE_TL, TCG_REG_R3, TCG_AREG0);
-
-    /* "Tail call" to the helper, with the return address back inline. */
-    tcg_out_call_int(s, 0, (const void *)(l->is_ld ? helper_unaligned_ld
-                                          : helper_unaligned_st));
-    return true;
-}
-
-static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
-{
-    return tcg_out_fail_alignment(s, l);
-}
-
-static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
-{
-    return tcg_out_fail_alignment(s, l);
-}
-#endif /* SOFTMMU */
 
 typedef struct {
     TCGReg base;