xref: /openbmc/linux/arch/x86/um/os-Linux/mcontext.c (revision b2441318)
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 
get_regs_from_mc(struct uml_pt_regs * regs,mcontext_t * mc)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 }
33