Chiebot-Mirror/boringssl - boringssl - Gitea: Git with a cup of tea

Author	SHA1	Message	Date
David Benjamin	1c919724d3	Support MOVLPS and MOVHPS in delocate. GCC 10.2.1 seems to be emitting code like this: movq gcm_gmult_clmul@GOTPCREL(%rip), %xmm0 movhps gcm_ghash_clmul@GOTPCREL(%rip), %xmm0 movaps %xmm0, (%rsp) This is assembling a pair of function pointers in %xmm0 and writing the two out together. I've not observed the compiler output movlps, but supporting movhps and movlps are about as tricky. The main complication is that these instructions preserve the unwritten half of the destination, and they do not support register sources, only memory. This CL supports them by loading in a general-purpose register as we usually do, pushing the register on the stack, and then running the instruction on (%rsp). Some alternatives I considered: - Save/restore a temporary XMM register and then use MOVHLPS and MOVLHPS. This would work but require another saveRegister-like wrapper. - Take advantage of loadFromGOT ending in a memory mov and swap out the final instruction. This would be more efficient, but we downgrade GOT-based accesses to local symbols to a plain LEA. The compiler will only do this when we write a pair of function pointers in a row, so trying to optimize the non-local symbols seems not worth the trouble. (Really the compiler should not be emitting GOT-relative loads at all, but the compiler doesn't know these symbols will be private and in the same module, so it has a habit of pessimally using GOT-based loads.) This option seemed the simplest. Change-Id: I8c4915a6a0d72aa4c5f4d581081b99b3a6ab64c2 Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/45244 Reviewed-by: Adam Langley <agl@google.com>	4 years ago
Adam Langley	c5e2cf3c07	delocate: support Aarch64 Add Aarch64 support to delocate. Since it's a modern ISA, it's actually not too bad once I understood the behaviour of the assembler. Change-Id: I105fede43b5196b7ff7bdbf1ee71c6cfa2fc1aab Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/44848 Reviewed-by: David Benjamin <davidben@google.com>	4 years ago
Adam Langley	56308910f3	delocate: use 64-bit GOT offsets in the large memory model. I tried to save space and use 32-bit GOT offsets since a GOT > 2GiB is crazy. However, Clang's linker emits 64-bit relocations even for .long, thus the four bytes following each offset get stomped. It mostly works because the relocations are applied in order, thus the following relocation gets stomped but is then processed and fixed. But there's four bytes of stomp at the end which hits the module integrity hash, which is fatal. This could be fixed by adding four bytes of padding after the list of offsets, but that's piling a hack on a hack. So this change just switches to 64-bit offsets. Change-Id: I227eec67c481d93a414fbed19aa99471f9df0f0e Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/42484 Commit-Queue: David Benjamin <davidben@google.com> Reviewed-by: David Benjamin <davidben@google.com>	5 years ago
Adam Langley	0cd846f24f	delocation: large memory model support. Large memory models on x86-64 allow the code/data of a shared object / executable to be larger than 2GiB. This is typically impossible because x86-64 code frequently uses int32 offsets from RIP. Consider the following program: int getpid(); int main() { return getpid(); } This is turned into the following assembly under a large memory model: .L0$pb: leaq .L0$pb(%rip), %rax movabsq $_GLOBAL_OFFSET_TABLE_-.L0$pb, %rcx addq %rax, %rcx movabsq $getpid@GOT, %rdx xorl %eax, %eax jmpq (%rcx,%rdx) # TAILCALL And, with relocations: 0: 48 8d 05 f9 ff ff ff lea -0x7(%rip),%rax # 0 <main> 7: 48 b9 00 00 00 00 00 movabs $0x0,%rcx e: 00 00 00 9: R_X86_64_GOTPC64 _GLOBAL_OFFSET_TABLE_+0x9 11: 48 01 c1 add %rax,%rcx 14: 48 ba 00 00 00 00 00 movabs $0x0,%rdx 1b: 00 00 00 16: R_X86_64_GOT64 getpid 1e: 31 c0 xor %eax,%eax 20: ff 24 11 jmpq (%rcx,%rdx,1) We can see that, in the large memory model, function calls involve loading the address of _GLOBAL_OFFSET_TABLE_ (using `movabs`, which takes a 64-bit immediate) and then indexing into it. Both cause relocations. If we link the binary and disassemble we get: 0000000000001120 <main>: 1120: 48 8d 05 f9 ff ff ff lea -0x7(%rip),%rax # 1120 <main> 1127: 48 b9 e0 2e 00 00 00 movabs $0x2ee0,%rcx 112e: 00 00 00 1131: 48 01 c1 add %rax,%rcx 1134: 48 ba d8 ff ff ff ff movabs $0xffffffffffffffd8,%rdx 113b: ff ff ff 113e: 31 c0 xor %eax,%eax 1140: ff 24 11 jmpq (%rcx,%rdx,1) Thus the _GLOBAL_OFFSET_TABLE_ symbol is at 0x1120+0x2ee0 = 0x4000. That's the address of the .got.plt section. But the offset “into” the table is -0x40, putting it at 0x3fd8, in .got: Idx Name Size VMA LMA File off Algn 18 .got 00000030 0000000000003fd0 0000000000003fd0 00002fd0 23 19 .got.plt 00000018 0000000000004000 0000000000004000 00003000 2*3 And, indeed, there's a dynamic relocation to setup that address: OFFSET TYPE VALUE 0000000000003fd8 R_X86_64_GLOB_DAT getpid@GLIBC_2.2.5 Accessing data or BSS works the same: the address of the variable is stored relative to _GLOBAL_OFFSET_TABLE_. This is a bit of a pain because we want to delocate the module into a single .text segment so that it moves through linking unaltered. If we took the obvious path and built our own offset table then it would need to contain absolute addresses, but they are only available at runtime and .text segments aren't supposed to be run-time patched. (That's why .rela.dyn is a separate segment.) If we use a different segment then we have the same problem as with the original offset table: the offset to the segment is unknown when compiling the module. Trying to pattern match this two-step lookup to do extensive rewriting seems fragile: I'm sure the compilers will move things around and interleave other work in time, if they don't already. So, in order to handle movabs trying to load _GLOBAL_OFFSET_TABLE_ we define a symbol in the same segment, but outside of the hashed region of the module, that contains the offset from that position to _GLOBAL_OFFSET_TABLE_: .boringssl_got_delta: .quad _GLOBAL_OFFSET_TABLE_-.boringssl_got_delta Then a movabs of $_GLOBAL_OFFSET_TABLE_-.Lfoo turns into: movq .boringssl_got_delta(%rip), %destreg addq $.boringssl_got_delta-.Lfoo, %destreg This works because it's calculating _GLOBAL_OFFSET_TABLE_ - got_delta + (got_delta - .Lfoo) When that value is added to .Lfoo, as the original code will do, the correct address results. Also it doesn't need an extra register because we know that 32-bit offsets are sufficient for offsets within the module. As for the offsets within the offset table, we have to load them from locations outside of the hashed part of the module to get the relocations out of the way. Again, no extra registers are needed. Change-Id: I87b19a2f8886bd9f7ac538fd55754e526bcf3097 Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/42324 Reviewed-by: Adam Langley <agl@google.com> Commit-Queue: Adam Langley <agl@google.com>	5 years ago
Adam Langley	fb0c05cac2	acvp: add CMAC-AES support. Change by Dan Janni. Change-Id: I3f059e7b1a822c6f97128ca92a693499a3f7fa8f Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/41984 Commit-Queue: Adam Langley <agl@google.com> Reviewed-by: David Benjamin <davidben@google.com>	5 years ago