cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mcontext.c (1168B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <sys/ucontext.h>
      3#define __FRAME_OFFSETS
      4#include <asm/ptrace.h>
      5#include <sysdep/ptrace.h>
      6
      7void get_regs_from_mc(struct uml_pt_regs *regs, mcontext_t *mc)
      8{
      9#ifdef __i386__
     10#define COPY2(X,Y) regs->gp[X] = mc->gregs[REG_##Y]
     11#define COPY(X) regs->gp[X] = mc->gregs[REG_##X]
     12#define COPY_SEG(X) regs->gp[X] = mc->gregs[REG_##X] & 0xffff;
     13#define COPY_SEG_CPL3(X) regs->gp[X] = (mc->gregs[REG_##X] & 0xffff) | 3;
     14	COPY_SEG(GS); COPY_SEG(FS); COPY_SEG(ES); COPY_SEG(DS);
     15	COPY(EDI); COPY(ESI); COPY(EBP);
     16	COPY2(UESP, ESP); /* sic */
     17	COPY(EBX); COPY(EDX); COPY(ECX); COPY(EAX);
     18	COPY(EIP); COPY_SEG_CPL3(CS); COPY(EFL); COPY_SEG_CPL3(SS);
     19#else
     20#define COPY2(X,Y) regs->gp[X/sizeof(unsigned long)] = mc->gregs[REG_##Y]
     21#define COPY(X) regs->gp[X/sizeof(unsigned long)] = mc->gregs[REG_##X]
     22	COPY(R8); COPY(R9); COPY(R10); COPY(R11);
     23	COPY(R12); COPY(R13); COPY(R14); COPY(R15);
     24	COPY(RDI); COPY(RSI); COPY(RBP); COPY(RBX);
     25	COPY(RDX); COPY(RAX); COPY(RCX); COPY(RSP);
     26	COPY(RIP);
     27	COPY2(EFLAGS, EFL);
     28	COPY2(CS, CSGSFS);
     29	regs->gp[CS / sizeof(unsigned long)] &= 0xffff;
     30	regs->gp[CS / sizeof(unsigned long)] |= 3;
     31#endif
     32}