root/arch/x86/um/os-Linux/mcontext.c

DEFINITIONS

1. get_regs_from_mc

   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 
   7 void 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 }