um/os-Linux/mcontext.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <sys/ucontext.h>
0003 #define __FRAME_OFFSETS
0004 #include <asm/ptrace.h>
0005 #include <sysdep/ptrace.h>
0006
0007 void get_regs_from_mc(struct uml_pt_regs *regs, mcontext_t *mc)
0008 {
0009 #ifdef __i386__
0010 #define COPY2(X,Y) regs->gp[X] = mc->gregs[REG_##Y]
0011 #define COPY(X) regs->gp[X] = mc->gregs[REG_##X]
0012 #define COPY_SEG(X) regs->gp[X] = mc->gregs[REG_##X] & 0xffff;
0013 #define COPY_SEG_CPL3(X) regs->gp[X] = (mc->gregs[REG_##X] & 0xffff) | 3;
0014     COPY_SEG(GS); COPY_SEG(FS); COPY_SEG(ES); COPY_SEG(DS);
0015     COPY(EDI); COPY(ESI); COPY(EBP);
0016     COPY2(UESP, ESP); /* sic */
0017     COPY(EBX); COPY(EDX); COPY(ECX); COPY(EAX);
0018     COPY(EIP); COPY_SEG_CPL3(CS); COPY(EFL); COPY_SEG_CPL3(SS);
0019 #else
0020 #define COPY2(X,Y) regs->gp[X/sizeof(unsigned long)] = mc->gregs[REG_##Y]
0021 #define COPY(X) regs->gp[X/sizeof(unsigned long)] = mc->gregs[REG_##X]
0022     COPY(R8); COPY(R9); COPY(R10); COPY(R11);
0023     COPY(R12); COPY(R13); COPY(R14); COPY(R15);
0024     COPY(RDI); COPY(RSI); COPY(RBP); COPY(RBX);
0025     COPY(RDX); COPY(RAX); COPY(RCX); COPY(RSP);
0026     COPY(RIP);
0027     COPY2(EFLAGS, EFL);
0028     COPY2(CS, CSGSFS);
0029     regs->gp[CS / sizeof(unsigned long)] &= 0xffff;
0030     regs->gp[CS / sizeof(unsigned long)] |= 3;
0031 #endif
0032 }