[PATCH 3/6] Improve OR1k context handling

jakob.viketoft at gmail.com jakob.viketoft at gmail.com
Sat Feb 20 08:33:33 UTC 2016


From: Jakob Viketoft <jakob.viketoft at aacmicrotec.com>

---
 cpukit/score/cpu/or1k/or1k-context-initialize.c |   13 ++-
 cpukit/score/cpu/or1k/or1k-context-switch.S     |  113 ++++++++++++-----------
 2 files changed, 69 insertions(+), 57 deletions(-)

diff --git a/cpukit/score/cpu/or1k/or1k-context-initialize.c b/cpukit/score/cpu/or1k/or1k-context-initialize.c
index a7205e3..d37458e 100644
--- a/cpukit/score/cpu/or1k/or1k-context-initialize.c
+++ b/cpukit/score/cpu/or1k/or1k-context-initialize.c
@@ -29,13 +29,22 @@ void _CPU_Context_Initialize(
   void *tls_area
 )
 {
-  /* Decrement 200 byte to account for red-zone */
-  uint32_t stack = ((uint32_t) stack_area_begin) - 200;
+  /* Decrement to account for redzone */
+  uint32_t stack = ((uint32_t) stack_area_begin) - REDZONE_SIZE;
   uint32_t sr;
   uint32_t stack_high = stack + stack_area_size;
 
   sr = _OR1K_mfspr(CPU_OR1K_SPR_SR);
 
+  /* Make sure we will adhere to the requested level */
+  if (new_level > 0) {
+    /* Interrupts disable in our local sr */
+    sr &= ~(CPU_OR1K_SPR_SR_IEE | CPU_OR1K_SPR_SR_TEE);
+  } else {
+    /* Interrupts enable in our local sr */
+    sr |= CPU_OR1K_SPR_SR_IEE | CPU_OR1K_SPR_SR_TEE;
+  }
+
   memset(context, 0, sizeof(*context));
 
   context->r1 = stack_high;
diff --git a/cpukit/score/cpu/or1k/or1k-context-switch.S b/cpukit/score/cpu/or1k/or1k-context-switch.S
index 91521e4..2a98cac 100644
--- a/cpukit/score/cpu/or1k/or1k-context-switch.S
+++ b/cpukit/score/cpu/or1k/or1k-context-switch.S
@@ -22,93 +22,96 @@ PUBLIC(_CPU_Context_restore_fp)
 PUBLIC(_CPU_Context_save_fp)
 
 SYM(_CPU_Context_switch):
-  l.sw  0(r3),r1
-  l.sw  4(r3),r2
-  l.sw  8(r3),r3
-  l.sw  12(r3),r4
-  l.sw  16(r3),r5
-  l.sw  20(r3),r6
-  l.sw  24(r3),r7
-  l.sw  28(r3),r8
-  l.sw  32(r3),r9
-  /* Skip r10 as it's preserved to be used by TLS */
-  /* The following set if registers are preserved across function calls */
-  l.sw  52(r3),r14
-  l.sw  60(r3),r16
-  l.sw  68(r3),r18
-  l.sw  76(r3),r20
-  l.sw  84(r3),r22
-  l.sw  92(r3),r24
-  l.sw  100(r3),r26
-  l.sw  108(r3),r28
-  l.sw  116(r3),r30
+  l.sw    OR1K_CC_GPR1(r3), r1
+  l.sw    OR1K_CC_GPR2(r3), r2
+  l.sw    OR1K_CC_GPR3(r3), r3
+  l.sw    OR1K_CC_GPR4(r3), r4
+  l.sw    OR1K_CC_GPR5(r3), r5
+  l.sw    OR1K_CC_GPR6(r3), r6
+  l.sw    OR1K_CC_GPR7(r3), r7
+  l.sw    OR1K_CC_GPR8(r3), r8
+  l.sw    OR1K_CC_GPR9(r3), r9
+  /* The following set of registers are preserved across function calls
+   * (callee-saved) */
+  l.sw    OR1K_CC_GPR10(r3), r10
+  l.sw    OR1K_CC_GPR12(r3), r12
+  l.sw    OR1K_CC_GPR14(r3), r14
+  l.sw    OR1K_CC_GPR16(r3), r16
+  l.sw    OR1K_CC_GPR18(r3), r18
+  l.sw    OR1K_CC_GPR20(r3), r20
+  l.sw    OR1K_CC_GPR22(r3), r22
+  l.sw    OR1K_CC_GPR24(r3), r24
+  l.sw    OR1K_CC_GPR26(r3), r26
+  l.sw    OR1K_CC_GPR28(r3), r28
+  l.sw    OR1K_CC_GPR30(r3), r30
 
   /* Supervision Register */
-  l.mfspr r13,r0, CPU_OR1K_SPR_SR
-  l.sw  124(r3),r13
+  l.mfspr r13, r0, CPU_OR1K_SPR_SR
+  l.sw    OR1K_CC_SR(r3), r13
 
   /* EPCR */
   l.mfspr r13, r0, CPU_OR1K_SPR_EPCR0
-  l.sw  128(r3), r13 /* epcr */
+  l.sw    OR1K_CC_EPCR0(r3), r13
 
   /* EEAR */
   l.mfspr r13, r0, CPU_OR1K_SPR_EEAR0
-  l.sw  132(r3), r13 /* eear */
+  l.sw    OR1K_CC_EEAR0(r3), r13
 
   /* ESR */
   l.mfspr r13, r0, CPU_OR1K_SPR_ESR0
-  l.sw  136(r3), r13  /* esr */
+  l.sw    OR1K_CC_ESR0(r3), r13
 
 SYM(restore):
-  l.lwz   r13,124(r4)
-  l.mtspr r0,r13, CPU_OR1K_SPR_SR
-
-  /* Exception level related registers */
+  l.lwz   r13, OR1K_CC_SR(r4)
+  l.mtspr r0, r13, CPU_OR1K_SPR_SR
 
   /* EPCR */
-  l.lwz  r13,  128(r4)
+  l.lwz   r13, OR1K_CC_EPCR0(r4)
   l.mtspr r0, r13, CPU_OR1K_SPR_EPCR0
 
   /* EEAR */
-  l.lwz  r13,  132(r4)
+  l.lwz   r13, OR1K_CC_EEAR0(r4)
   l.mtspr r0, r13, CPU_OR1K_SPR_EEAR0
 
   /* ESR */
-  l.lwz  r13,  136(r4)
+  l.lwz   r13,  OR1K_CC_ESR0(r4)
   l.mtspr r0, r13, CPU_OR1K_SPR_ESR0
 
-  l.lwz  r1,0(r4)
-  l.lwz  r2,4(r4)
-  l.lwz  r3,8(r4)
+  l.lwz   r1, OR1K_CC_GPR1(r4)
+  l.lwz   r2, OR1K_CC_GPR2(r4)
+  l.lwz   r3, OR1K_CC_GPR3(r4)
   /* Skip r4 as it contains the current buffer address */
-  l.lwz  r5,16(r4)
-  l.lwz  r6,20(r4)
-  l.lwz  r7,24(r4)
-  l.lwz  r8,28(r4)
-  l.lwz  r9,32(r4)
-  l.lwz  r14,52(r4)
-  l.lwz  r16,60(r4)
-  l.lwz  r18,68(r4)
-  l.lwz  r20,76(r4)
-  l.lwz  r22,84(r4)
-  l.lwz  r24,92(r4)
-  l.lwz  r26,100(r4)
-  l.lwz  r28,108(r4)
-  l.lwz  r30,116(r4)
-
-  l.lwz  r4,12(r4)
-
-  l.jr   r9
+  l.lwz   r5, OR1K_CC_GPR5(r4)
+  l.lwz   r6, OR1K_CC_GPR6(r4)
+  l.lwz   r7, OR1K_CC_GPR7(r4)
+  l.lwz   r8, OR1K_CC_GPR8(r4)
+  l.lwz   r9, OR1K_CC_GPR9(r4)
+  l.lwz   r10, OR1K_CC_GPR10(r4)
+  l.lwz   r12, OR1K_CC_GPR12(r4)
+  l.lwz   r14, OR1K_CC_GPR14(r4)
+  l.lwz   r16, OR1K_CC_GPR16(r4)
+  l.lwz   r18, OR1K_CC_GPR18(r4)
+  l.lwz   r20, OR1K_CC_GPR20(r4)
+  l.lwz   r22, OR1K_CC_GPR22(r4)
+  l.lwz   r24, OR1K_CC_GPR24(r4)
+  l.lwz   r26, OR1K_CC_GPR26(r4)
+  l.lwz   r28, OR1K_CC_GPR28(r4)
+  l.lwz   r30, OR1K_CC_GPR30(r4)
+
+  l.lwz   r4, OR1K_CC_GPR4(r4)
+
+  l.jr    r9
   l.nop
 
  SYM(_CPU_Context_restore):
-  l.add   r4,r3,r0
-  l.add   r13,r0,r0
+  l.add   r4, r3, r0
   l.j     restore
   l.nop
 
  SYM(_CPU_Context_restore_fp):
+  l.jr    r9
   l.nop
 
  SYM(_CPU_Context_save_fp):
+  l.jr    r9
   l.nop
-- 
1.7.10.4



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