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comparison src/cpu/x86/vm/nativeInst_x86.cpp @ 13223:78c808233ff1

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ensure instruction at verified entry point is safely patchable (GRAAL-605)
author Doug Simon <doug.simon@oracle.com>
date Mon, 02 Dec 2013 17:03:22 +0100
parents cd3d6a6b95d9
children 52b4284cb496
comparison
equal deleted inserted replaced
13209:b96cc3b87e87 13223:78c808233ff1
470 // entry point is in same cache line as unverified entry point, and the instruction being 470 // entry point is in same cache line as unverified entry point, and the instruction being
471 // patched is >= 5 byte (size of patch). 471 // patched is >= 5 byte (size of patch).
472 // 472 //
473 // In C2 the 5+ byte sized instruction is enforced by code in MachPrologNode::emit. 473 // In C2 the 5+ byte sized instruction is enforced by code in MachPrologNode::emit.
474 // In C1 the restriction is enforced by CodeEmitter::method_entry 474 // In C1 the restriction is enforced by CodeEmitter::method_entry
475 // In Graal, the restriction is enforced by HotSpotFrameContext.enter(...)
475 // 476 //
476 void NativeJump::patch_verified_entry(address entry, address verified_entry, address dest) { 477 void NativeJump::patch_verified_entry(address entry, address verified_entry, address dest) {
477 // complete jump instruction (to be inserted) is in code_buffer; 478 // complete jump instruction (to be inserted) is in code_buffer;
478 unsigned char code_buffer[5]; 479 unsigned char code_buffer[5];
479 code_buffer[0] = instruction_code; 480 code_buffer[0] = instruction_code;