| 673,7 → 673,7 |
|---|
| */ |
| wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(2), %wstate |
| |
| wrpr %g0, NWINDOW - 1, %cleanwin ! prevent unnecessary clean_window exceptions |
| wrpr %g0, NWINDOWS - 1, %cleanwin ! prevent unnecessary clean_window exceptions |
| |
| /* |
| * Switch to kernel stack. The old stack is |
| 830,7 → 830,7 |
|---|
| */ |
| and %g1, TSTATE_CWP_MASK, %l0 |
| inc %l0 |
| and %l0, NWINDOW - 1, %l0 ! %l0 mod NWINDOW |
| and %l0, NWINDOWS - 1, %l0 ! %l0 mod NWINDOWS |
| rdpr %cwp, %l1 |
| cmp %l0, %l1 |
| bz 0f ! CWP is ok |
| 901,7 → 901,7 |
|---|
| */ |
| sub %g1, %g2, %g3 |
| dec %g3 |
| and %g3, NWINDOW - 1, %g3 |
| and %g3, NWINDOWS - 1, %g3 |
| wrpr %g3, 0, %cwp |
| |
| /* |
| 933,7 → 933,7 |
|---|
| ldx [%g7 + I7_OFFSET], %i7 |
| |
| dec %g3 |
| and %g3, NWINDOW - 1, %g3 |
| and %g3, NWINDOWS - 1, %g3 |
| wrpr %g3, 0, %cwp ! switch to the preceeding window |
| |
| ba 0b |
| 946,13 → 946,13 |
|---|
| */ |
| wrpr %g1, 0, %cwp |
| add %g4, %g2, %g2 |
| cmp %g2, NWINDOW - 2 |
| bg 2f ! fix the CANRESTORE=NWINDOW-1 anomaly |
| mov NWINDOW - 2, %g1 ! use dealy slot for both cases |
| cmp %g2, NWINDOWS - 2 |
| bg 2f ! fix the CANRESTORE=NWINDOWS-1 anomaly |
| mov NWINDOWS - 2, %g1 ! use dealy slot for both cases |
| sub %g1, %g2, %g1 |
| |
| wrpr %g0, 0, %otherwin |
| wrpr %g1, 0, %cansave ! NWINDOW - 2 - CANRESTORE |
| wrpr %g1, 0, %cansave ! NWINDOWS - 2 - CANRESTORE |
| wrpr %g2, 0, %canrestore ! OTHERWIN + windows in the buffer |
| wrpr %g2, 0, %cleanwin ! avoid information leak |
| |
| 972,14 → 972,14 |
|---|
| * save %g6, -PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE, %sp |
| * |
| * instruction trapped and spilled a register window into the userspace |
| * window buffer, we have just restored NWINDOW - 1 register windows. |
| * window buffer, we have just restored NWINDOWS - 1 register windows. |
| * However, CANRESTORE can be only NWINDOW - 2 at most. |
| * |
| * The solution is to manually switch to (CWP - 1) mod NWINDOW |
| * The solution is to manually switch to (CWP - 1) mod NWINDOWS |
| * and set the window state registers so that: |
| * |
| * CANRESTORE = NWINDOW - 2 |
| * CLEANWIN = NWINDOW - 2 |
| * CANRESTORE = NWINDOWS - 2 |
| * CLEANWIN = NWINDOWS - 2 |
| * CANSAVE = 0 |
| * OTHERWIN = 0 |
| * |
| 993,7 → 993,7 |
|---|
| |
| rdpr %cwp, %g1 |
| dec %g1 |
| and %g1, NWINDOW - 1, %g1 |
| and %g1, NWINDOWS - 1, %g1 |
| wrpr %g1, 0, %cwp ! CWP-- |
| |
| .if \is_syscall |