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[PULL,16/32] tcg/s390x: Return false on failure from patch_reloc

Message ID 20181214031923.29527-18-richard.henderson@linaro.org
State Accepted
Commit 55dfd8fedceb1311d9cdded1a0f94b2da91a387d
Headers show
Series tcg patch queue | expand

Commit Message

Richard Henderson Dec. 14, 2018, 3:19 a.m. UTC 
This does require an extra two checks within the slow paths
to replace the assert that we're moving.  Also add two checks
within existing functions that lacked any kind of assert for
out of range branch.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

---
 tcg/s390/tcg-target.inc.c | 34 +++++++++++++++++++++++-----------
 1 file changed, 23 insertions(+), 11 deletions(-)

-- 
2.17.2
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Patch

diff --git a/tcg/s390/tcg-target.inc.c b/tcg/s390/tcg-target.inc.c
index 68a4c60394..39ecf609a1 100644
--- a/tcg/s390/tcg-target.inc.c
+++ b/tcg/s390/tcg-target.inc.c
@@ -377,23 +377,29 @@  static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
 
     switch (type) {
     case R_390_PC16DBL:
-        assert(pcrel2 == (int16_t)pcrel2);
-        tcg_patch16(code_ptr, pcrel2);
+        if (pcrel2 == (int16_t)pcrel2) {
+            tcg_patch16(code_ptr, pcrel2);
+            return true;
+        }
         break;
     case R_390_PC32DBL:
-        assert(pcrel2 == (int32_t)pcrel2);
-        tcg_patch32(code_ptr, pcrel2);
+        if (pcrel2 == (int32_t)pcrel2) {
+            tcg_patch32(code_ptr, pcrel2);
+            return true;
+        }
         break;
     case R_390_20:
-        assert(value == sextract64(value, 0, 20));
-        old = *(uint32_t *)code_ptr & 0xf00000ff;
-        old |= ((value & 0xfff) << 16) | ((value & 0xff000) >> 4);
-        tcg_patch32(code_ptr, old);
+        if (value == sextract64(value, 0, 20)) {
+            old = *(uint32_t *)code_ptr & 0xf00000ff;
+            old |= ((value & 0xfff) << 16) | ((value & 0xff000) >> 4);
+            tcg_patch32(code_ptr, old);
+            return true;
+        }
         break;
     default:
         g_assert_not_reached();
     }
-    return true;
+    return false;
 }
 
 /* parse target specific constraints */
@@ -1334,6 +1340,7 @@  static void tgen_compare_branch(TCGContext *s, S390Opcode opc, int cc,
 
     if (l->has_value) {
         off = l->u.value_ptr - s->code_ptr;
+        tcg_debug_assert(off == (int16_t)off);
     } else {
         tcg_out_reloc(s, s->code_ptr + 1, R_390_PC16DBL, l, 2);
     }
@@ -1350,6 +1357,7 @@  static void tgen_compare_imm_branch(TCGContext *s, S390Opcode opc, int cc,
 
     if (l->has_value) {
         off = l->u.value_ptr - s->code_ptr;
+        tcg_debug_assert(off == (int16_t)off);
     } else {
         tcg_out_reloc(s, s->code_ptr + 1, R_390_PC16DBL, l, 2);
     }
@@ -1615,7 +1623,9 @@  static void tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
     TCGMemOpIdx oi = lb->oi;
     TCGMemOp opc = get_memop(oi);
 
-    patch_reloc(lb->label_ptr[0], R_390_PC16DBL, (intptr_t)s->code_ptr, 2);
+    bool ok = patch_reloc(lb->label_ptr[0], R_390_PC16DBL,
+                          (intptr_t)s->code_ptr, 2);
+    tcg_debug_assert(ok);
 
     tcg_out_mov(s, TCG_TYPE_PTR, TCG_REG_R2, TCG_AREG0);
     if (TARGET_LONG_BITS == 64) {
@@ -1636,7 +1646,9 @@  static void tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
     TCGMemOpIdx oi = lb->oi;
     TCGMemOp opc = get_memop(oi);
 
-    patch_reloc(lb->label_ptr[0], R_390_PC16DBL, (intptr_t)s->code_ptr, 2);
+    bool ok = patch_reloc(lb->label_ptr[0], R_390_PC16DBL,
+                          (intptr_t)s->code_ptr, 2);
+    tcg_debug_assert(ok);
 
     tcg_out_mov(s, TCG_TYPE_PTR, TCG_REG_R2, TCG_AREG0);
     if (TARGET_LONG_BITS == 64) {