patch-1.3.48 linux/include/asm-mips/stackframe.h
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- Lines: 254
- Date:
Wed Dec 13 12:39:46 1995
- Orig file:
v1.3.47/linux/include/asm-mips/stackframe.h
- Orig date:
Fri Jan 13 20:37:30 1995
diff -u --recursive --new-file v1.3.47/linux/include/asm-mips/stackframe.h linux/include/asm-mips/stackframe.h
@@ -11,18 +11,12 @@
/*
* Stack layout for all exceptions:
*
- * ptrace needs to have all regs on the stack.
- * if the order here is changed, it needs to be
- * updated in asm/mips/fork.c:copy_process, asm/mips/signal.c:do_signal,
- * asm-mips/ptrace.c, include/asm-mips/ptrace.h
- * and asm-mips/ptrace
+ * ptrace needs to have all regs on the stack. If the order here is changed,
+ * it needs to be updated in include/asm-mips/ptrace.h
+ *
+ * The first PTRSIZE*5 bytes are argument save space for C subroutines.
*/
-
-/*
- * Offsets into the Interrupt stackframe.
- * The first 20 bytes are reserved for the usual MIPS calling sequence
- */
-#define FR_REG1 20
+#define FR_REG1 (PTRSIZE*5)
#define FR_REG2 ((FR_REG1) + 4)
#define FR_REG3 ((FR_REG2) + 4)
#define FR_REG4 ((FR_REG3) + 4)
@@ -74,121 +68,122 @@
*/
#define FR_INTERRUPT ((FR_CAUSE) + 4)
#define FR_ORIG_REG2 ((FR_INTERRUPT) + 4)
+#define FR_PAD1 ((FR_ORIG_REG2) + 4)
/*
- * Size of stack frame
+ * Size of stack frame, word/double word alignment
*/
-#define FR_SIZE ((FR_ORIG_REG2) + 4)
+#define FR_SIZE ((((FR_PAD1) + 4) + (PTRSIZE-1)) & ~(PTRSIZE-1))
-#define SAVE_ALL \
- mfc0 k0,CP0_STATUS; \
- andi k0,0x18; /* extract KSU bits */ \
- beqz k0,1f; \
- move k1,sp; \
- /* \
- * Called from user mode, new stack \
- */ \
- lui k1,%hi(_kernelsp); \
- lw k1,%lo(_kernelsp)(k1); \
-1: move k0,sp; \
- subu sp,k1,FR_SIZE; \
- sw k0,FR_REG29(sp); \
- sw $2,FR_REG2(sp); \
- sw $2,FR_ORIG_REG2(sp); \
- mfc0 v0,CP0_STATUS; \
- sw v0,FR_STATUS(sp); \
- mfc0 v0,CP0_CAUSE; \
- sw v0,FR_CAUSE(sp); \
- mfc0 v0,CP0_EPC; \
- sw v0,FR_EPC(sp); \
- mfhi v0; \
- sw v0,FR_HI(sp); \
- mflo v0; \
- sw v0,FR_LO(sp); \
- sw $1,FR_REG1(sp); \
- sw $3,FR_REG3(sp); \
- sw $4,FR_REG4(sp); \
- sw $5,FR_REG5(sp); \
- sw $6,FR_REG6(sp); \
- sw $7,FR_REG7(sp); \
- sw $8,FR_REG8(sp); \
- sw $9,FR_REG9(sp); \
- sw $10,FR_REG10(sp); \
- sw $11,FR_REG11(sp); \
- sw $12,FR_REG12(sp); \
- sw $13,FR_REG13(sp); \
- sw $14,FR_REG14(sp); \
- sw $15,FR_REG15(sp); \
- sw $16,FR_REG16(sp); \
- sw $17,FR_REG17(sp); \
- sw $18,FR_REG18(sp); \
- sw $19,FR_REG19(sp); \
- sw $20,FR_REG20(sp); \
- sw $21,FR_REG21(sp); \
- sw $22,FR_REG22(sp); \
- sw $23,FR_REG23(sp); \
- sw $24,FR_REG24(sp); \
- sw $25,FR_REG25(sp); \
- sw $28,FR_REG28(sp); \
- sw $30,FR_REG30(sp); \
- sw $31,FR_REG31(sp)
+#ifdef __R4000__
-#define RESTORE_ALL \
- lw v1,FR_EPC(sp); \
- lw v0,FR_HI(sp); \
- mtc0 v1,CP0_EPC; \
- lw v1,FR_LO(sp); \
- mthi v0; \
- lw v0,FR_STATUS(sp); \
- mtlo v1; \
- mtc0 v0,CP0_STATUS; \
- lw $31,FR_REG31(sp); \
- lw $30,FR_REG30(sp); \
- lw $28,FR_REG28(sp); \
- lw $25,FR_REG25(sp); \
- lw $24,FR_REG24(sp); \
- lw $23,FR_REG23(sp); \
- lw $22,FR_REG22(sp); \
- lw $21,FR_REG21(sp); \
- lw $20,FR_REG20(sp); \
- lw $19,FR_REG19(sp); \
- lw $18,FR_REG18(sp); \
- lw $17,FR_REG17(sp); \
- lw $16,FR_REG16(sp); \
- lw $15,FR_REG15(sp); \
- lw $14,FR_REG14(sp); \
- lw $13,FR_REG13(sp); \
- lw $12,FR_REG12(sp); \
- lw $11,FR_REG11(sp); \
- lw $10,FR_REG10(sp); \
- lw $9,FR_REG9(sp); \
- lw $8,FR_REG8(sp); \
- lw $7,FR_REG7(sp); \
- lw $6,FR_REG6(sp); \
- lw $5,FR_REG5(sp); \
- lw $4,FR_REG4(sp); \
- lw $3,FR_REG3(sp); \
- lw $2,FR_REG2(sp); \
- lw $1,FR_REG1(sp); \
- lw sp,FR_REG29(sp); /* Deallocate stack */ \
- eret
+#define SAVE_ALL \
+ mfc0 k0,CP0_STATUS; \
+ sll k0,3; /* extract cu0 bit */ \
+ bltz k0,8f; \
+ move k1,sp; \
+ /* \
+ * Called from user mode, new stack \
+ */ \
+ lui k1,%hi(kernelsp); \
+ lw k1,%lo(kernelsp)(k1); \
+8: move k0,sp; \
+ subu sp,k1,FR_SIZE; \
+ sw k0,FR_REG29(sp); \
+ sw $2,FR_REG2(sp); \
+ sw $2,FR_ORIG_REG2(sp); \
+ mfc0 v0,CP0_STATUS; \
+ sw v0,FR_STATUS(sp); \
+ mfc0 v0,CP0_CAUSE; \
+ sw v0,FR_CAUSE(sp); \
+ mfc0 v0,CP0_EPC; \
+ sw v0,FR_EPC(sp); \
+ mfhi v0; \
+ sw v0,FR_HI(sp); \
+ mflo v0; \
+ sw v0,FR_LO(sp); \
+ sw $1,FR_REG1(sp); \
+ sw $3,FR_REG3(sp); \
+ sw $4,FR_REG4(sp); \
+ sw $5,FR_REG5(sp); \
+ sw $6,FR_REG6(sp); \
+ sw $7,FR_REG7(sp); \
+ sw $8,FR_REG8(sp); \
+ sw $9,FR_REG9(sp); \
+ sw $10,FR_REG10(sp); \
+ sw $11,FR_REG11(sp); \
+ sw $12,FR_REG12(sp); \
+ sw $13,FR_REG13(sp); \
+ sw $14,FR_REG14(sp); \
+ sw $15,FR_REG15(sp); \
+ sw $16,FR_REG16(sp); \
+ sw $17,FR_REG17(sp); \
+ sw $18,FR_REG18(sp); \
+ sw $19,FR_REG19(sp); \
+ sw $20,FR_REG20(sp); \
+ sw $21,FR_REG21(sp); \
+ sw $22,FR_REG22(sp); \
+ sw $23,FR_REG23(sp); \
+ sw $24,FR_REG24(sp); \
+ sw $25,FR_REG25(sp); \
+ sw $28,FR_REG28(sp); \
+ sw $30,FR_REG30(sp); \
+ sw $31,FR_REG31(sp)
/*
- * Move to kernel mode and disable interrupts
+ * Note that we restore the IE flags from stack. This means
+ * that a modified IE mask will be nullified.
*/
-#define CLI \
- mfc0 k0,CP0_STATUS; \
- ori k0,k0,0x1f; \
- xori k0,k0,0x1f; \
- mtc0 k0,CP0_STATUS
+#define RESTORE_ALL \
+ .set mips3; \
+ mfc0 t0,CP0_STATUS; \
+ ori t0,0x1f; \
+ xori t0,0x1f; \
+ mtc0 t0,CP0_STATUS; \
+ \
+ lw v0,FR_STATUS(sp); \
+ lw v1,FR_LO(sp); \
+ mtc0 v0,CP0_STATUS; \
+ mtlo v1; \
+ lw v0,FR_HI(sp); \
+ lw v1,FR_EPC(sp); \
+ mthi v0; \
+ mtc0 v1,CP0_EPC; \
+ lw $31,FR_REG31(sp); \
+ lw $30,FR_REG30(sp); \
+ lw $28,FR_REG28(sp); \
+ lw $25,FR_REG25(sp); \
+ lw $24,FR_REG24(sp); \
+ lw $23,FR_REG23(sp); \
+ lw $22,FR_REG22(sp); \
+ lw $21,FR_REG21(sp); \
+ lw $20,FR_REG20(sp); \
+ lw $19,FR_REG19(sp); \
+ lw $18,FR_REG18(sp); \
+ lw $17,FR_REG17(sp); \
+ lw $16,FR_REG16(sp); \
+ lw $15,FR_REG15(sp); \
+ lw $14,FR_REG14(sp); \
+ lw $13,FR_REG13(sp); \
+ lw $12,FR_REG12(sp); \
+ lw $11,FR_REG11(sp); \
+ lw $10,FR_REG10(sp); \
+ lw $9,FR_REG9(sp); \
+ lw $8,FR_REG8(sp); \
+ lw $7,FR_REG7(sp); \
+ lw $6,FR_REG6(sp); \
+ lw $5,FR_REG5(sp); \
+ lw $4,FR_REG4(sp); \
+ lw $3,FR_REG3(sp); \
+ lw $2,FR_REG2(sp); \
+ lw $1,FR_REG1(sp); \
+ lw sp,FR_REG29(sp); /* Deallocate stack */ \
+ .set mips0
-/*
- * Move to kernel mode and enable interrupts
- */
-#define STI \
- mfc0 k0,CP0_STATUS; \
- ori k0,k0,0x1f; \
- xori k0,k0,0x1e; \
- mtc0 k0,CP0_STATUS
+#else /* !defined (__R4000__) */
+
+#error "Implement SAVE_ALL and RESTORE_ALL!"
+
+#endif /* !defined (__R4000__) */
#endif /* __ASM_MIPS_STACKFRAME_H */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov
with Sam's (original) version of this