diff options
Diffstat (limited to 'libs/context/src/asm/fcontext_mips32_o32_elf_gas.S')
| -rw-r--r-- | libs/context/src/asm/fcontext_mips32_o32_elf_gas.S | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/libs/context/src/asm/fcontext_mips32_o32_elf_gas.S b/libs/context/src/asm/fcontext_mips32_o32_elf_gas.S new file mode 100644 index 0000000000..be86f185ec --- /dev/null +++ b/libs/context/src/asm/fcontext_mips32_o32_elf_gas.S @@ -0,0 +1,144 @@ +/* + Copyright Oliver Kowalke 2009. + Distributed under the Boost Software License, Version 1.0. + (See accompanying file LICENSE_1_0.txt or copy at + http://www.boost.org/LICENSE_1_0.txt) +*/ + +/******************************************************************* + * * + * ------------------------------------------------------------- * + * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | * + * ------------------------------------------------------------- * + * | 0 | 8 | 16 | 24 | 32 | 40 | 48 | 56 | 64 | 72 | * + * ------------------------------------------------------------- * + * | S0 | S1 | S2 | S3 | S4 | S5 | S6 | S7 | GP | SP | * + * ------------------------------------------------------------- * + * ------------------------------------------------------------- * + * | 10 | 11 | 12 | | * + * ------------------------------------------------------------- * + * | 80 | 88 | 96 | | * + * ------------------------------------------------------------- * + * | S8 | RA | PC | | * + * ------------------------------------------------------------- * + * ------------------------------------------------------------- * + * | 13 | 14 | | * + * ------------------------------------------------------------- * + * | 104 | 112 | | * + * ------------------------------------------------------------- * + * |sbase|slimt| | * + * ------------------------------------------------------------- * + * ------------------------------------------------------------- * + * | 15 | 16 | 17 | 18 | 19 | 20 | | * + * ------------------------------------------------------------- * + * | 120 | 128 | 136 | 144 | 152 | 160 | | * + * ------------------------------------------------------------- * + * | F20 | F22 | F24 | F26 | F28 | F30 | | * + * ------------------------------------------------------------- * + * * + * *****************************************************************/ + +.text +.globl jump_fcontext +.align 2 +.type jump_fcontext,@function +.ent jump_fcontext +jump_fcontext: + sw $s0, ($a0) # save S0 + sw $s1, 8($a0) # save S1 + sw $s2, 16($a0) # save S2 + sw $s3, 24($a0) # save S3 + sw $s4, 32($a0) # save S4 + sw $s5, 40($a0) # save S5 + sw $s6, 48($a0) # save S6 + sw $s7, 56($a0) # save S7 + sw $gp, 64($a0) # save GP + sw $sp, 72($a0) # save SP + sw $s8, 80($a0) # save S8 + sw $ra, 88($a0) # save RA + sw $ra, 96($a0) # save RA as PC + +#if defined(__mips_hard_float) + beqz $a3, 1f # test if fpu env should be preserved + s.d $f20, 120($a0) # save F20 + s.d $f22, 128($a0) # save F22 + s.d $f24, 136($a0) # save F24 + s.d $f26, 144($a0) # save F26 + s.d $f28, 152($a0) # save F28 + s.d $f30, 160($a0) # save F30 + + l.d $f20, 120($a1) # restore F20 + l.d $f22, 128($a1) # restore F22 + l.d $f24, 136($a1) # restore F24 + l.d $f26, 144($a1) # restore F26 + l.d $f28, 152($a1) # restore F28 + l.d $f30, 160($a1) # restore F30 +1: +#endif + + lw $s0, ($a1) # restore S0 + lw $s1, 8($a1) # restore S1 + lw $s2, 16($a1) # restore S2 + lw $s3, 24($a1) # restore S3 + lw $s4, 32($a1) # restore S4 + lw $s5, 40($a1) # restore S5 + lw $s6, 48($a1) # restore S6 + lw $s7, 56($a1) # restore S7 + lw $gp, 64($a1) # restore GP + lw $sp, 72($a1) # restore SP + lw $s8, 80($a1) # restore S8 + lw $ra, 88($a1) # restore RA + move $a0, $s2 # restore void pointer as argument + + move $v0, $a2 # use third arg as return value after jump + move $a0, $a2 # use third arg as first arg in context function + + lw $t9, 96($a1) # load PC + jr $t9 # jump to context +.end jump_fcontext +.size jump_fcontext, .-jump_fcontext + +.text +.globl make_fcontext +.align 2 +.type make_fcontext,@function +.ent make_fcontext +make_fcontext: +#ifdef __PIC__ +.set noreorder +.cpload $t9 +.set reorder +#endif + sw $a0, ($a0) # save the current context + sw $gp, 24($a0) # save global pointer + sw $a1, 96($a0) # save the address of the context function + lw $t0, 104($a0) # load the stack base + + sub $sp, $sp, 28 + sw $ra, 24($sp) + sw $a0, 20($sp) + move $a0, $t0 # stack pointer as arg for align_stack + lw $t9, %call16(align_stack)($gp) # align stack + jalr $t9 + nop + move $t0, $v0 # begin of aligned stack + lw $ra, 24($sp) + lw $a0, 20($sp) + addi $sp, $sp, 28 + + sub $t0, $t0, 16 # reserve 16 byte of argument space + sw $t0, 72($a0) # save the algned stack base + + la $t9, finish # helper code executed after context function returns + sw $t9, 88($a0) + + move $v0, $zero + jr $ra + +finish: + move $gp, $s3 # restore GP (global pointer) + move $a0, $zero # exit code is zero + lw $t9, %call16(_exit)($gp) # exit application + jalr $t9 +.end make_fcontext +.size make_fcontext, .-make_fcontext |