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@@ -65,6 +65,7 @@
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@ r2 = faulted PC+4
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@ r9 = successful return
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@ r10 = vfp_state union
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+@ r11 = CPU number
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@ lr = failure return
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.globl vfp_support_entry
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@@ -79,7 +80,7 @@ vfp_support_entry:
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DBGSTR1 "enable %x", r10
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ldr r3, last_VFP_context_address
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orr r1, r1, #FPEXC_ENABLE @ user FPEXC has the enable bit set
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- ldr r4, [r3] @ last_VFP_context pointer
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+ ldr r4, [r3, r11, lsl #2] @ last_VFP_context pointer
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bic r5, r1, #FPEXC_EXCEPTION @ make sure exceptions are disabled
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cmp r4, r10
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beq check_for_exception @ we are returning to the same
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@@ -91,7 +92,9 @@ vfp_support_entry:
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@ exceptions, so we can get at the
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@ rest of it
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+#ifndef CONFIG_SMP
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@ Save out the current registers to the old thread state
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+ @ No need for SMP since this is not done lazily
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DBGSTR1 "save old state %p", r4
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cmp r4, #0
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@@ -105,10 +108,11 @@ vfp_support_entry:
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stmia r4, {r1, r5, r6, r8} @ save FPEXC, FPSCR, FPINST, FPINST2
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@ and point r4 at the word at the
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@ start of the register dump
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+#endif
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no_old_VFP_process:
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DBGSTR1 "load state %p", r10
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- str r10, [r3] @ update the last_VFP_context pointer
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+ str r10, [r3, r11, lsl #2] @ update the last_VFP_context pointer
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@ Load the saved state back into the VFP
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VFPFLDMIA r10 @ reload the working registers while
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@ FPEXC is in a safe state
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@@ -162,6 +166,24 @@ process_exception:
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@ required. If not, the user code will
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@ retry the faulted instruction
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+#ifdef CONFIG_SMP
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+ .globl vfp_save_state
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+ .type vfp_save_state, %function
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+vfp_save_state:
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+ @ Save the current VFP state
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+ @ r0 - save location
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+ @ r1 - FPEXC
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+ DBGSTR1 "save VFP state %p", r0
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+ VFPFMRX r2, FPSCR @ current status
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+ VFPFMRX r3, FPINST @ FPINST (always there, rev0 onwards)
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+ tst r1, #FPEXC_FPV2 @ is there an FPINST2 to read?
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+ VFPFMRX r12, FPINST2, NE @ FPINST2 if needed - avoids reading
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+ @ nonexistant reg on rev0
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+ VFPFSTMIA r0 @ save the working registers
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+ stmia r0, {r1, r2, r3, r12} @ save FPEXC, FPSCR, FPINST, FPINST2
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+ mov pc, lr
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+#endif
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+
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last_VFP_context_address:
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.word last_VFP_context
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