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Clear the IT state when invoking a Thumb-2 signal handler

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If a process is interrupted during an If-Then block and a signal is
invoked, the ITSTATE bits must be cleared otherwise the handler would
not run correctly.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Joseph S. Myers <joseph@codesourcery.com>
This commit is contained in:
Catalin Marinas 2009-05-30 14:00:15 +01:00
parent ba3c02636a
commit d71e1352e2
2 changed files with 13 additions and 2 deletions
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7
arch/arm/include/asm/ptrace.h
View file

@ -65,6 +65,13 @@
#define PSR_x 0x0000ff00 /* Extension */
#define PSR_c 0x000000ff /* Control */
/*
* ARMv7 groups of APSR bits
*/
#define PSR_ISET_MASK 0x01000010 /* ISA state (J, T) mask */
#define PSR_IT_MASK 0x0600fc00 /* If-Then execution state mask */
#define PSR_ENDIAN_MASK 0x00000200 /* Endianness state mask */
#ifndef __ASSEMBLY__
/*

8
arch/arm/kernel/signal.c
View file

@ -426,9 +426,13 @@ setup_return(struct pt_regs *regs, struct k_sigaction *ka,
*/
thumb = handler & 1;
if (thumb)
if (thumb) {
cpsr |= PSR_T_BIT;
else
#if __LINUX_ARM_ARCH__ >= 7
/* clear the If-Then Thumb-2 execution state */
cpsr &= ~PSR_IT_MASK;
#endif
} else
cpsr &= ~PSR_T_BIT;
}
#endif