diff options
Diffstat (limited to 'usr/klibc/arch/ia64/setjmp.S')
| -rw-r--r-- | usr/klibc/arch/ia64/setjmp.S | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/usr/klibc/arch/ia64/setjmp.S b/usr/klibc/arch/ia64/setjmp.S new file mode 100644 index 0000000..ab1cea2 --- /dev/null +++ b/usr/klibc/arch/ia64/setjmp.S @@ -0,0 +1,343 @@ +/* + * IA-64 specific setjmp/longjmp routines + * + * Inspired by setjmp.s from the FreeBSD kernel. + */ + +#define J_UNAT 0 +#define J_NATS 0x8 +#define J_PFS 0x10 +#define J_BSP 0x18 +#define J_RNAT 0x20 +#define J_PREDS 0x28 +#define J_LC 0x30 +#define J_R4 0x38 +#define J_R5 0x40 +#define J_R6 0x48 +#define J_R7 0x50 +#define J_SP 0x58 +#define J_F2 0x60 +#define J_F3 0x70 +#define J_F4 0x80 +#define J_F5 0x90 +#define J_F16 0xa0 +#define J_F17 0xb0 +#define J_F18 0xc0 +#define J_F19 0xd0 +#define J_F20 0xe0 +#define J_F21 0xf0 +#define J_F22 0x100 +#define J_F23 0x110 +#define J_F24 0x120 +#define J_F25 0x130 +#define J_F26 0x140 +#define J_F27 0x150 +#define J_F28 0x160 +#define J_F29 0x170 +#define J_F30 0x180 +#define J_F31 0x190 +#define J_FPSR 0x1a0 +#define J_B0 0x1a8 +#define J_B1 0x1b0 +#define J_B2 0x1b8 +#define J_B3 0x1c0 +#define J_B4 0x1c8 +#define J_B5 0x1d0 +#define J_SIGMASK 0x1d8 +#define J_SIGSET 0x1e0 +#define J_GP 0x1f0 + +// int setjmp(struct jmp_buffer *) +// +// Setup a non-local goto. +// +// Description: +// +// SetJump stores the current register set in the area pointed to +// by "save". It returns zero. Subsequent calls to "LongJump" will +// restore the registers and return non-zero to the same location. +// +// On entry, r32 contains the pointer to the jmp_buffer +// + .align 32 + .global setjmp + .proc setjmp +setjmp: + // + // Make sure buffer is aligned at 16byte boundary + // + add r10 = -0x10,r0 ;; // mask the lower 4 bits + and r32 = r32, r10;; + add r32 = 0x10, r32;; // move to next 16 byte boundary + + add r10 = J_PREDS, r32 // skip Unats & pfs save area + add r11 = J_BSP, r32 + // + // save immediate context + // + mov r2 = ar.bsp // save backing store pointer + mov r3 = pr // save predicates + flushrs + ;; + // + // save user Unat register + // + mov r16 = ar.lc // save loop count register + mov r14 = ar.unat // save user Unat register + + st8 [r10] = r3, J_LC-J_PREDS + st8 [r11] = r2, J_R4-J_BSP + ;; + st8 [r10] = r16, J_R5-J_LC + st8 [r32] = r14, J_NATS // Note: Unat at the + // beginning of the save area + mov r15 = ar.pfs + ;; + // + // save preserved general registers & NaT's + // + st8.spill [r11] = r4, J_R6-J_R4 + ;; + st8.spill [r10] = r5, J_R7-J_R5 + ;; + st8.spill [r11] = r6, J_SP-J_R6 + ;; + st8.spill [r10] = r7, J_F3-J_R7 + ;; + st8.spill [r11] = sp, J_F2-J_SP + ;; + // + // save spilled Unat and pfs registers + // + mov r2 = ar.unat // save Unat register after spill + ;; + st8 [r32] = r2, J_PFS-J_NATS // save unat for spilled regs + ;; + st8 [r32] = r15 // save pfs + // + // save floating registers + // + stf.spill [r11] = f2, J_F4-J_F2 + stf.spill [r10] = f3, J_F5-J_F3 + ;; + stf.spill [r11] = f4, J_F16-J_F4 + stf.spill [r10] = f5, J_F17-J_F5 + ;; + stf.spill [r11] = f16, J_F18-J_F16 + stf.spill [r10] = f17, J_F19-J_F17 + ;; + stf.spill [r11] = f18, J_F20-J_F18 + stf.spill [r10] = f19, J_F21-J_F19 + ;; + stf.spill [r11] = f20, J_F22-J_F20 + stf.spill [r10] = f21, J_F23-J_F21 + ;; + stf.spill [r11] = f22, J_F24-J_F22 + stf.spill [r10] = f23, J_F25-J_F23 + ;; + stf.spill [r11] = f24, J_F26-J_F24 + stf.spill [r10] = f25, J_F27-J_F25 + ;; + stf.spill [r11] = f26, J_F28-J_F26 + stf.spill [r10] = f27, J_F29-J_F27 + ;; + stf.spill [r11] = f28, J_F30-J_F28 + stf.spill [r10] = f29, J_F31-J_F29 + ;; + stf.spill [r11] = f30, J_FPSR-J_F30 + stf.spill [r10] = f31, J_B0-J_F31 // size of f31 + fpsr + // + // save FPSR register & branch registers + // + mov r2 = ar.fpsr // save fpsr register + mov r3 = b0 + ;; + st8 [r11] = r2, J_B1-J_FPSR + st8 [r10] = r3, J_B2-J_B0 + mov r2 = b1 + mov r3 = b2 + ;; + st8 [r11] = r2, J_B3-J_B1 + st8 [r10] = r3, J_B4-J_B2 + mov r2 = b3 + mov r3 = b4 + ;; + st8 [r11] = r2, J_B5-J_B3 + st8 [r10] = r3 + mov r2 = b5 + ;; + st8 [r11] = r2 + ;; + // + // return + // + mov r8 = r0 // return 0 from setjmp + mov ar.unat = r14 // restore unat + br.ret.sptk b0 + .endp setjmp + +// +// void longjmp(struct jmp_buffer *, int val) +// +// Perform a non-local goto. +// +// Description: +// +// LongJump initializes the register set to the values saved by a +// previous 'SetJump' and jumps to the return location saved by that +// 'SetJump'. This has the effect of unwinding the stack and returning +// for a second time to the 'SetJump'. +// + + .align 32 + .global longjmp + .proc longjmp +longjmp: + // + // Make sure buffer is aligned at 16byte boundary + // + add r10 = -0x10,r0 ;; // mask the lower 4 bits + and r32 = r32, r10;; + add r32 = 0x10, r32;; // move to next 16 byte boundary + + // + // caching the return value as we do invala in the end + // + mov r8 = r33 // return value + + // + // get immediate context + // + mov r14 = ar.rsc // get user RSC conf + add r10 = J_PFS, r32 // get address of pfs + add r11 = J_NATS, r32 + ;; + ld8 r15 = [r10], J_BSP-J_PFS // get pfs + ld8 r2 = [r11], J_LC-J_NATS // get unat for spilled regs + ;; + mov ar.unat = r2 + ;; + ld8 r16 = [r10], J_PREDS-J_BSP // get backing store pointer + mov ar.rsc = r0 // put RSE in enforced lazy + mov ar.pfs = r15 + ;; + + // + // while returning from longjmp the BSPSTORE and BSP needs to be + // same and discard all the registers allocated after we did + // setjmp. Also, we need to generate the RNAT register since we + // did not flushed the RSE on setjmp. + // + mov r17 = ar.bspstore // get current BSPSTORE + ;; + cmp.ltu p6,p7 = r17, r16 // is it less than BSP of +(p6) br.spnt.few .flush_rse + mov r19 = ar.rnat // get current RNAT + ;; + loadrs // invalidate dirty regs + br.sptk.many .restore_rnat // restore RNAT + +.flush_rse: + flushrs + ;; + mov r19 = ar.rnat // get current RNAT + mov r17 = r16 // current BSPSTORE + ;; +.restore_rnat: + // + // check if RNAT is saved between saved BSP and curr BSPSTORE + // + mov r18 = 0x3f + ;; + dep r18 = r18,r16,3,6 // get RNAT address + ;; + cmp.ltu p8,p9 = r18, r17 // RNAT saved on RSE + ;; +(p8) ld8 r19 = [r18] // get RNAT from RSE + ;; + mov ar.bspstore = r16 // set new BSPSTORE + ;; + mov ar.rnat = r19 // restore RNAT + mov ar.rsc = r14 // restore RSC conf + + + ld8 r3 = [r11], J_R4-J_LC // get lc register + ld8 r2 = [r10], J_R5-J_PREDS // get predicates + ;; + mov pr = r2, -1 + mov ar.lc = r3 + // + // restore preserved general registers & NaT's + // + ld8.fill r4 = [r11], J_R6-J_R4 + ;; + ld8.fill r5 = [r10], J_R7-J_R5 + ld8.fill r6 = [r11], J_SP-J_R6 + ;; + ld8.fill r7 = [r10], J_F2-J_R7 + ld8.fill sp = [r11], J_F3-J_SP + ;; + // + // restore floating registers + // + ldf.fill f2 = [r10], J_F4-J_F2 + ldf.fill f3 = [r11], J_F5-J_F3 + ;; + ldf.fill f4 = [r10], J_F16-J_F4 + ldf.fill f5 = [r11], J_F17-J_F5 + ;; + ldf.fill f16 = [r10], J_F18-J_F16 + ldf.fill f17 = [r11], J_F19-J_F17 + ;; + ldf.fill f18 = [r10], J_F20-J_F18 + ldf.fill f19 = [r11], J_F21-J_F19 + ;; + ldf.fill f20 = [r10], J_F22-J_F20 + ldf.fill f21 = [r11], J_F23-J_F21 + ;; + ldf.fill f22 = [r10], J_F24-J_F22 + ldf.fill f23 = [r11], J_F25-J_F23 + ;; + ldf.fill f24 = [r10], J_F26-J_F24 + ldf.fill f25 = [r11], J_F27-J_F25 + ;; + ldf.fill f26 = [r10], J_F28-J_F26 + ldf.fill f27 = [r11], J_F29-J_F27 + ;; + ldf.fill f28 = [r10], J_F30-J_F28 + ldf.fill f29 = [r11], J_F31-J_F29 + ;; + ldf.fill f30 = [r10], J_FPSR-J_F30 + ldf.fill f31 = [r11], J_B0-J_F31 ;; + + // + // restore branch registers and fpsr + // + ld8 r16 = [r10], J_B1-J_FPSR // get fpsr + ld8 r17 = [r11], J_B2-J_B0 // get return pointer + ;; + mov ar.fpsr = r16 + mov b0 = r17 + ld8 r2 = [r10], J_B3-J_B1 + ld8 r3 = [r11], J_B4-J_B2 + ;; + mov b1 = r2 + mov b2 = r3 + ld8 r2 = [r10], J_B5-J_B3 + ld8 r3 = [r11] + ;; + mov b3 = r2 + mov b4 = r3 + ld8 r2 = [r10] + ld8 r21 = [r32] // get user unat + ;; + mov b5 = r2 + mov ar.unat = r21 + + // + // invalidate ALAT + // + invala ;; + + br.ret.sptk b0 + .endp longjmp |