relocInfo_ppc.cpp revision 9751:4a24de859a87 
1/*
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8 * published by the Free Software Foundation.
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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24 */
25
26#include "precompiled.hpp"
27#include "asm/assembler.inline.hpp"
28#include "code/relocInfo.hpp"
29#include "nativeInst_ppc.hpp"
30#include "oops/klass.inline.hpp"
31#include "oops/oop.inline.hpp"
32#include "runtime/safepoint.hpp"
33
34void Relocation::pd_set_data_value(address x, intptr_t o, bool verify_only) {
35  // The following comment is from the declaration of DataRelocation:
36  //
37  //  "The "o" (displacement) argument is relevant only to split relocations
38  //   on RISC machines.  In some CPUs (SPARC), the set-hi and set-lo ins'ns
39  //   can encode more than 32 bits between them.  This allows compilers to
40  //   share set-hi instructions between addresses that differ by a small
41  //   offset (e.g., different static variables in the same class).
42  //   On such machines, the "x" argument to set_value on all set-lo
43  //   instructions must be the same as the "x" argument for the
44  //   corresponding set-hi instructions.  The "o" arguments for the
45  //   set-hi instructions are ignored, and must not affect the high-half
46  //   immediate constant.  The "o" arguments for the set-lo instructions are
47  //   added into the low-half immediate constant, and must not overflow it."
48  //
49  // Currently we don't support splitting of relocations, so o must be
50  // zero:
51  assert(o == 0, "tried to split relocations");
52
53  if (!verify_only) {
54    if (format() != 1) {
55      nativeMovConstReg_at(addr())->set_data_plain(((intptr_t)x), code());
56    } else {
57      assert(type() == relocInfo::oop_type || type() == relocInfo::metadata_type,
58             "how to encode else?");
59      narrowOop no = (type() == relocInfo::oop_type) ?
60        oopDesc::encode_heap_oop((oop)x) : Klass::encode_klass((Klass*)x);
61      nativeMovConstReg_at(addr())->set_narrow_oop(no, code());
62    }
63  } else {
64    guarantee((address) (nativeMovConstReg_at(addr())->data()) == x, "data must match");
65  }
66}
67
68address Relocation::pd_call_destination(address orig_addr) {
69  intptr_t adj = 0;
70  address inst_loc = addr();
71
72  if (orig_addr != NULL) {
73    // We just moved this call instruction from orig_addr to addr().
74    // This means its target will appear to have grown by addr() - orig_addr.
75    adj = -(inst_loc - orig_addr);
76  }
77  if (NativeFarCall::is_far_call_at(inst_loc)) {
78    NativeFarCall* call = nativeFarCall_at(inst_loc);
79    return call->destination() + (intptr_t)(call->is_pcrelative() ? adj : 0);
80  } else if (NativeJump::is_jump_at(inst_loc)) {
81    NativeJump* jump = nativeJump_at(inst_loc);
82    return jump->jump_destination() + (intptr_t)(jump->is_pcrelative() ? adj : 0);
83  } else if (NativeConditionalFarBranch::is_conditional_far_branch_at(inst_loc)) {
84    NativeConditionalFarBranch* branch = NativeConditionalFarBranch_at(inst_loc);
85    return branch->branch_destination();
86  } else {
87    orig_addr = nativeCall_at(inst_loc)->get_trampoline();
88    if (orig_addr == NULL) {
89      return (address) -1;
90    } else {
91      return ((NativeCallTrampolineStub*)orig_addr)->destination();
92    }
93  }
94}
95
96void Relocation::pd_set_call_destination(address x) {
97  address inst_loc = addr();
98
99  if (NativeFarCall::is_far_call_at(inst_loc)) {
100    NativeFarCall* call = nativeFarCall_at(inst_loc);
101    call->set_destination(x);
102  } else if (NativeJump::is_jump_at(inst_loc)) {
103    NativeJump* jump= nativeJump_at(inst_loc);
104    jump->set_jump_destination(x);
105  } else if (NativeConditionalFarBranch::is_conditional_far_branch_at(inst_loc)) {
106    NativeConditionalFarBranch* branch = NativeConditionalFarBranch_at(inst_loc);
107    branch->set_branch_destination(x);
108  } else {
109    NativeCall* call = nativeCall_at(inst_loc);
110    call->set_destination_mt_safe(x, false);
111  }
112}
113
114address* Relocation::pd_address_in_code() {
115  ShouldNotReachHere();
116  return 0;
117}
118
119address Relocation::pd_get_address_from_code() {
120  return (address)(nativeMovConstReg_at(addr())->data());
121}
122
123void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
124}
125
126void metadata_Relocation::pd_fix_value(address x) {
127}
128