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-rw-r--r--arch/sparc/kernel/utrap.S29
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/sparc/kernel/utrap.S b/arch/sparc/kernel/utrap.S
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+++ b/arch/sparc/kernel/utrap.S
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+/* SPDX-License-Identifier: GPL-2.0 */
+ .globl utrap_trap
+ .type utrap_trap,#function
+utrap_trap: /* %g3=handler,%g4=level */
+ TRAP_LOAD_THREAD_REG(%g6, %g1)
+ ldx [%g6 + TI_UTRAPS], %g1
+ brnz,pt %g1, invoke_utrap
+ nop
+
+ ba,pt %xcc, etrap
+ rd %pc, %g7
+ mov %l4, %o1
+ call bad_trap
+ add %sp, PTREGS_OFF, %o0
+ ba,a,pt %xcc, rtrap
+
+invoke_utrap:
+ sllx %g3, 3, %g3
+ ldx [%g1 + %g3], %g1
+ save %sp, -128, %sp
+ rdpr %tstate, %l6
+ rdpr %cwp, %l7
+ andn %l6, TSTATE_CWP, %l6
+ wrpr %l6, %l7, %tstate
+ rdpr %tpc, %l6
+ rdpr %tnpc, %l7
+ wrpr %g1, 0, %tnpc
+ done
+ .size utrap_trap,.-utrap_trap