Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 173 insertions, 0 deletions

diff --git a/nsprpub/pr/src/md/unix/os_SunOS_ultrasparc.s b/nsprpub/pr/src/md/unix/os_SunOS_ultrasparc.s
new file mode 100644
index 0000000000..32bf7884ac
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_SunOS_ultrasparc.s
@@ -0,0 +1,173 @@
+! -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+! 
+! This Source Code Form is subject to the terms of the Mozilla Public
+! License, v. 2.0. If a copy of the MPL was not distributed with this
+! file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+!
+!  atomic increment, decrement and swap routines for V8+ sparc (ultrasparc)
+!  using CAS (compare-and-swap) atomic instructions
+!
+!  this MUST be compiled with an ultrasparc-aware assembler
+!
+!  standard asm linkage macros; this module must be compiled
+!  with the -P option (use C preprocessor)
+
+#include <sys/asm_linkage.h>
+
+!  ======================================================================
+!
+!  Perform the sequence a = a + 1 atomically with respect to other
+!  fetch-and-adds to location a in a wait-free fashion.
+!
+!  usage : val = PR_AtomicIncrement(address)
+!  return: current value (you'd think this would be old val)
+!
+!  -----------------------
+!  Note on REGISTER USAGE:
+!  as this is a LEAF procedure, a new stack frame is not created;
+!  we use the caller's stack frame so what would normally be %i (input)
+!  registers are actually %o (output registers).  Also, we must not
+!  overwrite the contents of %l (local) registers as they are not
+!  assumed to be volatile during calls.
+!
+!  So, the registers used are:
+!     %o0  [input]   - the address of the value to increment
+!     %o1  [local]   - work register
+!     %o2  [local]   - work register
+!     %o3  [local]   - work register
+!  -----------------------
+
+        ENTRY(PR_AtomicIncrement)       ! standard assembler/ELF prologue
+
+retryAI:
+        ld      [%o0], %o2              ! set o2 to the current value
+        add     %o2, 0x1, %o3           ! calc the new value
+        mov     %o3, %o1                ! save the return value
+        cas     [%o0], %o2, %o3         ! atomically set if o0 hasn't changed
+        cmp     %o2, %o3                ! see if we set the value
+        bne     retryAI                 ! if not, try again
+        nop                             ! empty out the branch pipeline
+        retl                            ! return back to the caller
+        mov     %o1, %o0                ! set the return code to the new value
+
+        SET_SIZE(PR_AtomicIncrement)    ! standard assembler/ELF epilogue
+
+!
+!  end
+!
+!  ======================================================================
+!
+
+!  ======================================================================
+!
+!  Perform the sequence a = a - 1 atomically with respect to other
+!  fetch-and-decs to location a in a wait-free fashion.
+!
+!  usage : val = PR_AtomicDecrement(address)
+!  return: current value (you'd think this would be old val)
+!
+!  -----------------------
+!  Note on REGISTER USAGE:
+!  as this is a LEAF procedure, a new stack frame is not created;
+!  we use the caller's stack frame so what would normally be %i (input)
+!  registers are actually %o (output registers).  Also, we must not
+!  overwrite the contents of %l (local) registers as they are not
+!  assumed to be volatile during calls.
+!
+!  So, the registers used are:
+!     %o0  [input]   - the address of the value to increment
+!     %o1  [local]   - work register
+!     %o2  [local]   - work register
+!     %o3  [local]   - work register
+!  -----------------------
+
+        ENTRY(PR_AtomicDecrement)       ! standard assembler/ELF prologue
+
+retryAD:
+        ld      [%o0], %o2              ! set o2 to the current value
+        sub     %o2, 0x1, %o3           ! calc the new value
+        mov     %o3, %o1                ! save the return value
+        cas     [%o0], %o2, %o3         ! atomically set if o0 hasn't changed
+        cmp     %o2, %o3                ! see if we set the value
+        bne     retryAD                 ! if not, try again
+        nop                             ! empty out the branch pipeline
+        retl                            ! return back to the caller
+        mov     %o1, %o0                ! set the return code to the new value
+
+        SET_SIZE(PR_AtomicDecrement)    ! standard assembler/ELF epilogue
+
+!
+!  end
+!
+!  ======================================================================
+!
+
+!  ======================================================================
+!
+!  Perform the sequence a = b atomically with respect to other
+!  fetch-and-stores to location a in a wait-free fashion.
+!
+!  usage : old_val = PR_AtomicSet(address, newval)
+!
+!  -----------------------
+!  Note on REGISTER USAGE:
+!  as this is a LEAF procedure, a new stack frame is not created;
+!  we use the caller's stack frame so what would normally be %i (input)
+!  registers are actually %o (output registers).  Also, we must not
+!  overwrite the contents of %l (local) registers as they are not
+!  assumed to be volatile during calls.
+!
+!  So, the registers used are:
+!     %o0  [input]   - the address of the value to increment
+!     %o1  [input]   - the new value to set for [%o0]
+!     %o2  [local]   - work register
+!     %o3  [local]   - work register
+!  -----------------------
+
+        ENTRY(PR_AtomicSet)             ! standard assembler/ELF prologue
+
+retryAS:
+        ld      [%o0], %o2              ! set o2 to the current value
+        mov     %o1, %o3                ! set up the new value
+        cas     [%o0], %o2, %o3         ! atomically set if o0 hasn't changed
+        cmp     %o2, %o3                ! see if we set the value
+        bne     retryAS                 ! if not, try again
+        nop                             ! empty out the branch pipeline
+        retl                            ! return back to the caller
+        mov     %o3, %o0                ! set the return code to the prev value
+
+        SET_SIZE(PR_AtomicSet)          ! standard assembler/ELF epilogue
+
+!
+!  end
+!
+!  ======================================================================
+!
+
+!  ======================================================================
+!
+!  Perform the sequence a = a + b atomically with respect to other
+!  fetch-and-adds to location a in a wait-free fashion.
+!
+!  usage : newval = PR_AtomicAdd(address, val)
+!  return: the value after addition
+!
+        ENTRY(PR_AtomicAdd)       ! standard assembler/ELF prologue
+
+retryAA:
+        ld      [%o0], %o2              ! set o2 to the current value
+        add     %o2, %o1, %o3           ! calc the new value
+        mov     %o3, %o4                ! save the return value
+        cas     [%o0], %o2, %o3         ! atomically set if o0 hasn't changed
+        cmp     %o2, %o3                ! see if we set the value
+        bne     retryAA                 ! if not, try again
+        nop                             ! empty out the branch pipeline
+        retl                            ! return back to the caller
+        mov     %o4, %o0                ! set the return code to the new value
+
+        SET_SIZE(PR_AtomicAdd)    		! standard assembler/ELF epilogue
+
+!
+!  end
+!