[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-4.1-testing] xen-detect: Fix cpuid asm for 32-bit PIC compilation.
# HG changeset patch # User Keir Fraser <keir@xxxxxxx> # Date 1308826993 -3600 # Node ID eab9c077003c7df47811ce6fb8d0539708383d95 # Parent 61dbf453167e0e51a4dad187852055ec1aa2968e xen-detect: Fix cpuid asm for 32-bit PIC compilation. Signed-off-by: Keir Fraser <keir@xxxxxxx> xen-unstable changeset: 23553:eca057e4475c xen-unstable date: Fri Jun 17 08:08:13 2011 +0100 --- diff -r 61dbf453167e -r eab9c077003c tools/misc/xen-detect.c --- a/tools/misc/xen-detect.c Thu Jun 23 12:02:54 2011 +0100 +++ b/tools/misc/xen-detect.c Thu Jun 23 12:03:13 2011 +0100 @@ -33,43 +33,46 @@ #include <unistd.h> #include <getopt.h> -static void cpuid(uint32_t idx, - uint32_t *eax, - uint32_t *ebx, - uint32_t *ecx, - uint32_t *edx, - int pv_context) +static void cpuid(uint32_t idx, uint32_t *regs, int pv_context) { asm volatile ( - "test %1,%1 ; jz 1f ; ud2a ; .ascii \"xen\" ; 1: cpuid" - : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx) - : "0" (idx), "1" (pv_context) ); +#ifdef __i386__ +#define R(x) "%%e"#x"x" +#else +#define R(x) "%%r"#x"x" +#endif + "push "R(a)"; push "R(b)"; push "R(c)"; push "R(d)"\n\t" + "test %1,%1 ; jz 1f ; ud2a ; .ascii \"xen\" ; 1: cpuid\n\t" + "mov %%eax,(%2); mov %%ebx,4(%2)\n\t" + "mov %%ecx,8(%2); mov %%edx,12(%2)\n\t" + "pop "R(d)"; pop "R(c)"; pop "R(b)"; pop "R(a)"\n\t" + : : "a" (idx), "c" (pv_context), "S" (regs) : "memory" ); } static int check_for_xen(int pv_context) { - uint32_t eax, ebx, ecx, edx; + uint32_t regs[4]; char signature[13]; uint32_t base; for ( base = 0x40000000; base < 0x40010000; base += 0x100 ) { - cpuid(base, &eax, &ebx, &ecx, &edx, pv_context); + cpuid(base, regs, pv_context); - *(uint32_t *)(signature + 0) = ebx; - *(uint32_t *)(signature + 4) = ecx; - *(uint32_t *)(signature + 8) = edx; + *(uint32_t *)(signature + 0) = regs[1]; + *(uint32_t *)(signature + 4) = regs[2]; + *(uint32_t *)(signature + 8) = regs[3]; signature[12] = '\0'; - if ( !strcmp("XenVMMXenVMM", signature) && (eax >= (base + 2)) ) + if ( !strcmp("XenVMMXenVMM", signature) && (regs[0] >= (base + 2)) ) goto found; } return 0; found: - cpuid(base + 1, &eax, &ebx, &ecx, &edx, pv_context); - return eax; + cpuid(base + 1, regs, pv_context); + return regs[0]; } static jmp_buf sigill_jmp; _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-changelog
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