Messages in this thread Patch in this message | | | Date | 27 Dec 2002 18:14:00 +0200 | From | (Kai Henningsen) | Subject | Re: Intel P6 vs P7 system call performance |
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torvalds@transmeta.com (Linus Torvalds) wrote on 23.12.02 in <Pine.LNX.4.44.0212232005080.2328-100000@home.transmeta.com>:
> Something like the appended, perhaps? > > Linus > > ===== arch/i386/kernel/entry.S 1.45 vs edited ===== > --- 1.45/arch/i386/kernel/entry.S Wed Dec 18 14:42:17 2002 > +++ edited/arch/i386/kernel/entry.S Mon Dec 23 20:02:10 2002 > @@ -233,7 +233,7 @@ > #endif > > /* Points to after the "sysenter" instruction in the vsyscall page */ > -#define SYSENTER_RETURN 0xffffe00a > +#define SYSENTER_RETURN 0xffffe010 > > # sysenter call handler stub > ALIGN > ===== arch/i386/kernel/sysenter.c 1.5 vs edited ===== > --- 1.5/arch/i386/kernel/sysenter.c Sun Dec 22 21:12:23 2002 > +++ edited/arch/i386/kernel/sysenter.c Mon Dec 23 20:04:33 2002 > @@ -57,12 +57,17 @@ > 0x51, /* push %ecx */ > 0x52, /* push %edx */ > 0x55, /* push %ebp */ > + /* 3: backjump target */ > 0x89, 0xe5, /* movl %esp,%ebp */ > 0x0f, 0x34, /* sysenter */ > - 0x00, /* align return point */
Also 0x90 here?
> - /* System call restart point is here! (SYSENTER_RETURN - 2) */ > - 0xeb, 0xfa, /* jmp to "movl %esp,%ebp" */ > - /* System call normal return point is here! (SYSENTER_RETURN in entry.S) > */ + > + /* 7: align return point with nop's to make disassembly easier */ > + 0x90, 0x90, 0x90, 0x90, > + 0x90, 0x90, 0x90, > + > + /* 14: System call restart point is here! (SYSENTER_RETURN - 2) */ > + 0xeb, 0xf3, /* jmp to "movl %esp,%ebp" */ > + /* 16: System call normal return point is here! (SYSENTER_RETURN in > entry.S) */ 0x5d, /* pop %ebp */ > 0x5a, /* pop %edx */ > 0x59, /* pop %ecx */
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