mcontext.c

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#include <sys/ucontext.h>
#define __FRAME_OFFSETS
#include <asm/ptrace.h>
#include <sysdep/ptrace.h>

void get_regs_from_mc(struct uml_pt_regs *regs, mcontext_t *mc)
{
#ifdef __i386__
#define COPY2(X,Y) regs->gp[X] = mc->gregs[REG_##Y]
#define COPY(X) regs->gp[X] = mc->gregs[REG_##X]
#define COPY_SEG(X) regs->gp[X] = mc->gregs[REG_##X] & 0xffff;
#define COPY_SEG_CPL3(X) regs->gp[X] = (mc->gregs[REG_##X] & 0xffff) | 3;
    COPY_SEG(GS); COPY_SEG(FS); COPY_SEG(ES); COPY_SEG(DS);
    COPY(EDI); COPY(ESI); COPY(EBP);
    COPY2(UESP, ESP); /* sic */
    COPY(EBX); COPY(EDX); COPY(ECX); COPY(EAX);
    COPY(EIP); COPY_SEG_CPL3(CS); COPY(EFL); COPY_SEG_CPL3(SS);
#else
#define COPY2(X,Y) regs->gp[X/sizeof(unsigned long)] = mc->gregs[REG_##Y]
#define COPY(X) regs->gp[X/sizeof(unsigned long)] = mc->gregs[REG_##X]
    COPY(R8); COPY(R9); COPY(R10); COPY(R11);
    COPY(R12); COPY(R13); COPY(R14); COPY(R15);
    COPY(RDI); COPY(RSI); COPY(RBP); COPY(RBX);
    COPY(RDX); COPY(RAX); COPY(RCX); COPY(RSP);
    COPY(RIP);
    COPY2(EFLAGS, EFL);
    COPY2(CS, CSGSFS);
    regs->gp[CS / sizeof(unsigned long)] &= 0xffff;
    regs->gp[CS / sizeof(unsigned long)] |= 3;
#endif
}