From ab3c2887d53865f3918fe3e5da13f8ead0b6c90d Mon Sep 17 00:00:00 2001 From: Mystery Man Date: Tue, 20 May 2003 13:38:10 +0000 Subject: This commit was manufactured by cvs2svn to create tag 'V9_2_0_1mdk'. --- mdk-stage1/dietlibc/sparc/__longjmp.S | 67 ----------------------------------- 1 file changed, 67 deletions(-) delete mode 100644 mdk-stage1/dietlibc/sparc/__longjmp.S (limited to 'mdk-stage1/dietlibc/sparc/__longjmp.S') diff --git a/mdk-stage1/dietlibc/sparc/__longjmp.S b/mdk-stage1/dietlibc/sparc/__longjmp.S deleted file mode 100644 index 72e001a2f..000000000 --- a/mdk-stage1/dietlibc/sparc/__longjmp.S +++ /dev/null @@ -1,67 +0,0 @@ -#include - -#define JB_SP 0 -#define JB_FP 1 -#define JB_PC 2 - -#define ENV(base,reg) [%base + (reg * 4)] -#define ST_FLUSH_WINDOWS 3 -#define RW_FP [%fp + 0x48] - -.text -.global __longjmp -__longjmp: - /* Store our arguments in global registers so we can still - use them while unwinding frames and their register windows. */ - - ld ENV(o0,JB_FP), %g3 /* Cache target FP in register %g3. */ - mov %o0, %g1 /* ENV in %g1 */ - orcc %o1, %g0, %g2 /* VAL in %g2 */ - be,a 0f /* Branch if zero; else skip delay slot. */ - mov 1, %g2 /* Delay slot only hit if zero: VAL = 1. */ -0: - xor %fp, %g3, %o0 - add %fp, 512, %o1 - andncc %o0, 4095, %o0 - bne .Lthread - cmp %o1, %g3 - bl .Lthread - - /* Now we will loop, unwinding the register windows up the stack - until the restored %fp value matches the target value in %g3. */ - -.Lloop: - cmp %fp, %g3 /* Have we reached the target frame? */ - bl,a .Lloop /* Loop while current fp is below target. */ - restore /* Unwind register window in delay slot. */ - be,a .Lfound /* Better have hit it exactly. */ - ld ENV(g1,JB_SP), %o0 /* Delay slot: extract target SP. */ - -.Lthread: - /* - * Do a "flush register windows trap". The trap handler in the - * kernel writes all the register windows to their stack slots, and - * marks them all as invalid (needing to be sucked up from the - * stack when used). This ensures that all information needed to - * unwind to these callers is in memory, not in the register - * windows. - */ - ta ST_FLUSH_WINDOWS - ld ENV(g1,JB_PC), %o7 /* Set return PC. */ - ld ENV(g1,JB_SP), %fp /* Set saved SP on restore below. */ - sub %fp, 64, %sp /* Allocate a register frame. */ - st %g3, RW_FP /* Set saved FP on restore below. */ - retl - restore %g2, 0, %o0 /* Restore values from above register frame. */ - -.Lfound: - /* We have unwound register windows so %fp matches the target. */ - mov %o0, %sp /* OK, install new SP. */ - -.Lsp_ok: - ld ENV(g1,JB_PC), %o0 /* Extract target return PC. */ - jmp %o0 + 8 /* Return there. */ - mov %g2, %o0 /* Delay slot: set return value. */ - -.size __longjmp, . - __longjmp - -- cgit v1.2.1