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um: Allow building and running on older hosts
Commita78ff11122
("um: add extended processor state save/restore support") andb6024b21fe
("um: extend fpstate to _xstate to support YMM registers") forced the use of the x86 FP _xstate and PTRACE_GETREGSET/SETREGSET. On older hosts, we would neither be able to build UML nor run it anymore with these two commits applied because we don't have definitions for struct _xstate nor these two ptrace requests. We can determine at build time which fp context structure to check against, just like we can keep using the old i387 fp save/restore if PTRACE_GETRESET/SETREGSET are not defined. Fixes:a78ff11122
("um: add extended processor state save/restore support") Fixes:b6024b21fe
("um: extend fpstate to _xstate to support YMM registers") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at>
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@ -26,6 +26,7 @@ int save_i387_registers(int pid, unsigned long *fp_regs)
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int save_fp_registers(int pid, unsigned long *fp_regs)
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{
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#ifdef PTRACE_GETREGSET
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struct iovec iov;
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if (have_xstate_support) {
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@ -34,9 +35,9 @@ int save_fp_registers(int pid, unsigned long *fp_regs)
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if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
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return -errno;
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return 0;
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} else {
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} else
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#endif
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return save_i387_registers(pid, fp_regs);
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}
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}
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int restore_i387_registers(int pid, unsigned long *fp_regs)
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@ -48,6 +49,7 @@ int restore_i387_registers(int pid, unsigned long *fp_regs)
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int restore_fp_registers(int pid, unsigned long *fp_regs)
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{
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#ifdef PTRACE_SETREGSET
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struct iovec iov;
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if (have_xstate_support) {
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@ -56,9 +58,9 @@ int restore_fp_registers(int pid, unsigned long *fp_regs)
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if (ptrace(PTRACE_SETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
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return -errno;
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return 0;
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} else {
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} else
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#endif
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return restore_i387_registers(pid, fp_regs);
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}
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}
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#ifdef __i386__
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@ -122,6 +124,7 @@ int put_fp_registers(int pid, unsigned long *regs)
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void arch_init_registers(int pid)
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{
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#ifdef PTRACE_GETREGSET
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struct _xstate fp_regs;
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struct iovec iov;
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@ -129,6 +132,7 @@ void arch_init_registers(int pid)
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iov.iov_len = sizeof(struct _xstate);
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if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) == 0)
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have_xstate_support = 1;
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#endif
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}
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#endif
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@ -50,7 +50,11 @@ void foo(void)
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DEFINE(HOST_GS, GS);
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DEFINE(HOST_ORIG_AX, ORIG_EAX);
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#else
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#if defined(PTRACE_GETREGSET) && defined(PTRACE_SETREGSET)
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DEFINE(HOST_FP_SIZE, sizeof(struct _xstate) / sizeof(unsigned long));
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#else
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DEFINE(HOST_FP_SIZE, sizeof(struct _fpstate) / sizeof(unsigned long));
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#endif
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DEFINE_LONGS(HOST_BX, RBX);
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DEFINE_LONGS(HOST_CX, RCX);
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DEFINE_LONGS(HOST_DI, RDI);
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