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4dcc29e157
Problem: An application violating the architectural rules regarding operation dependencies and having specific Register Stack Engine (RSE) state at the time of the violation, may result in an illegal operation fault and invalid RSE state. Such faults may initiate a cascade of repeated illegal operation faults within OS interruption handlers. The specific behavior is OS dependent. Implication: An application causing an illegal operation fault with specific RSE state may result in a series of illegal operation faults and an eventual OS stack overflow condition. Workaround: OS interruption handlers that switch to kernel backing store implement a check for invalid RSE state to avoid the series of illegal operation faults. The core of the workaround is the RSE_WORKAROUND code sequence inserted into each invocation of the SAVE_MIN_WITH_COVER and SAVE_MIN_WITH_COVER_R19 macros. This sequence includes hard-coded constants that depend on the number of stacked physical registers being 96. The rest of this patch consists of code to disable this workaround should this not be the case (with the presumption that if a future Itanium processor increases the number of registers, it would also remove the need for this patch). Move the start of the RBS up to a mod32 boundary to avoid some corner cases. The dispatch_illegal_op_fault code outgrew the spot it was squatting in when built with this patch and CONFIG_VIRT_CPU_ACCOUNTING=y Move it out to the end of the ivt. Signed-off-by: Tony Luck <tony.luck@intel.com>
26 lines
1.0 KiB
C
26 lines
1.0 KiB
C
#ifndef _ASM_IA64_SECTIONS_H
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#define _ASM_IA64_SECTIONS_H
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/*
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* Copyright (C) 1998-2003 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*/
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#include <asm-generic/sections.h>
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extern char __per_cpu_start[], __per_cpu_end[], __phys_per_cpu_start[];
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extern char __start___vtop_patchlist[], __end___vtop_patchlist[];
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extern char __start___rse_patchlist[], __end___rse_patchlist[];
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extern char __start___mckinley_e9_bundles[], __end___mckinley_e9_bundles[];
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extern char __start___phys_stack_reg_patchlist[], __end___phys_stack_reg_patchlist[];
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extern char __start_gate_section[];
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extern char __start_gate_mckinley_e9_patchlist[], __end_gate_mckinley_e9_patchlist[];
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extern char __start_gate_vtop_patchlist[], __end_gate_vtop_patchlist[];
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extern char __start_gate_fsyscall_patchlist[], __end_gate_fsyscall_patchlist[];
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extern char __start_gate_brl_fsys_bubble_down_patchlist[], __end_gate_brl_fsys_bubble_down_patchlist[];
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extern char __start_unwind[], __end_unwind[];
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extern char __start_ivt_text[], __end_ivt_text[];
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#endif /* _ASM_IA64_SECTIONS_H */
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