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Generate illegal instruction fault if LWS syscall returns -EFAULT.

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2022-01-02  John David Anglin  <danglin@gcc.gnu.org>

libgcc/ChangeLog:

	* config/pa/linux-atomic.c (_ASM_EFAULT): Define.
	(__kernel_cmpxchg): Nullify illegal iitlbp instruction if error
	return is not equal _ASM_EFAULT.
	(__kernel_cmpxchg2): Likewise.
This commit is contained in:
John David Anglin 2022-01-02 17:12:45 +00:00
parent 4759c16bee
commit 4620531ea9
1 changed files with 6 additions and 0 deletions
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6
libgcc/config/pa/linux-atomic.c
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@ -28,6 +28,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#define EBUSY 16
#define ENOSYS 251
#define _ASM_EFAULT "-14"
typedef unsigned char u8;
typedef short unsigned int u16;
#ifdef __LP64__
@ -58,6 +60,8 @@ __kernel_cmpxchg (volatile void *mem, int oldval, int newval)
register long lws_errno asm("r21");
asm volatile ( "ble 0xb0(%%sr2, %%r0) \n\t"
"ldi %2, %%r20 \n\t"
"cmpiclr,<> " _ASM_EFAULT ", %%r21, %%r0\n\t"
"iitlbp %%r0,(%%sr0, %%r0) \n\t"
: "=r" (lws_ret), "=r" (lws_errno)
: "i" (LWS_CAS), "r" (lws_mem), "r" (lws_old), "r" (lws_new)
: "r1", "r20", "r22", "r23", "r29", "r31", "memory"
@ -84,6 +88,8 @@ __kernel_cmpxchg2 (volatile void *mem, const void *oldval, const void *newval,
register long lws_errno asm("r21");
asm volatile ( "ble 0xb0(%%sr2, %%r0) \n\t"
"ldi %6, %%r20 \n\t"
"cmpiclr,<> " _ASM_EFAULT ", %%r21, %%r0\n\t"
"iitlbp %%r0,(%%sr0, %%r0) \n\t"
: "=r" (lws_ret), "=r" (lws_errno), "+r" (lws_mem),
"+r" (lws_old), "+r" (lws_new), "+r" (lws_size)
: "i" (2)