Author: jhb Date: Tue Jan 14 18:00:04 2020 New Revision: 356737 URL: https://svnweb.freebsd.org/changeset/base/356737
Log: Preserve the inherited value of the status register in cpu_set_upcall(). Instead of re-deriving the value of SR using logic similar to exec_set_regs(), just inherit the value from the existing thread similar to fork(). Reviewed by: brooks Obtained from: CheriBSD Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D23059 Modified: head/sys/mips/mips/vm_machdep.c Modified: head/sys/mips/mips/vm_machdep.c ============================================================================== --- head/sys/mips/mips/vm_machdep.c Tue Jan 14 17:56:54 2020 (r356736) +++ head/sys/mips/mips/vm_machdep.c Tue Jan 14 18:00:04 2020 (r356737) @@ -414,7 +414,7 @@ cpu_set_upcall(struct thread *td, void (*entry)(void * stack_t *stack) { struct trapframe *tf; - register_t sp; + register_t sp, sr; sp = (((intptr_t)stack->ss_sp + stack->ss_size) & ~(STACK_ALIGN - 1)) - CALLFRAME_SIZ; @@ -424,8 +424,10 @@ cpu_set_upcall(struct thread *td, void (*entry)(void * * function. */ tf = td->td_frame; + sr = tf->sr; bzero(tf, sizeof(struct trapframe)); tf->sp = sp; + tf->sr = sr; tf->pc = (register_t)(intptr_t)entry; /* * MIPS ABI requires T9 to be the same as PC @@ -434,18 +436,6 @@ cpu_set_upcall(struct thread *td, void (*entry)(void * tf->t9 = (register_t)(intptr_t)entry; tf->a0 = (register_t)(intptr_t)arg; - /* - * Keep interrupt mask - */ - td->td_frame->sr = MIPS_SR_KSU_USER | MIPS_SR_EXL | MIPS_SR_INT_IE | - (mips_rd_status() & MIPS_SR_INT_MASK); -#if defined(__mips_n32) - td->td_frame->sr |= MIPS_SR_PX; -#elif defined(__mips_n64) - td->td_frame->sr |= MIPS_SR_PX | MIPS_SR_UX | MIPS_SR_KX; -#endif -/* tf->sr |= (ALL_INT_MASK & idle_mask) | SR_INT_ENAB; */ - /**XXX the above may now be wrong -- mips2 implements this as panic */ /* * FREEBSD_DEVELOPERS_FIXME: * Setup any other CPU-Specific registers (Not MIPS Standard) _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
