-
Notifications
You must be signed in to change notification settings - Fork 16
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
feat(mips): initial support for mips
- Loading branch information
Showing
4 changed files
with
317 additions
and
2 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,289 @@ | ||
| use core::arch::asm; | ||
| use core::fmt; | ||
| use core::ops; | ||
| use gimli::{Register, MIPS}; | ||
|
|
||
| // Match DWARF_FRAME_REGISTERS in libgcc | ||
| pub const MAX_REG_RULES: usize = 188; | ||
|
|
||
| #[repr(C)] | ||
| #[derive(Clone, Default)] | ||
| pub struct Context { | ||
| pub gp: [usize; 32], | ||
| #[cfg(target_feature = "single-float")] | ||
| pub fp: [usize; 32], | ||
| } | ||
|
|
||
| impl fmt::Debug for Context { | ||
| fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| let mut fmt = fmt.debug_struct("Context"); | ||
| for i in 0..=31 { | ||
| fmt.field(MIPS::register_name(Register(i as _)).unwrap(), &self.gp[i]); | ||
| } | ||
| #[cfg(target_feature = "single-float")] | ||
| for i in 0..=31 { | ||
| fmt.field( | ||
| MIPS::register_name(Register((i + 32) as _)).unwrap(), | ||
| &self.fp[i], | ||
| ); | ||
| } | ||
| fmt.finish() | ||
| } | ||
| } | ||
|
|
||
| impl ops::Index<Register> for Context { | ||
| type Output = usize; | ||
|
|
||
| fn index(&self, reg: Register) -> &usize { | ||
| match reg { | ||
| Register(0..=31) => &self.gp[reg.0 as usize], | ||
| #[cfg(target_feature = "single-float")] | ||
| Register(32..=63) => &self.fp[(reg.0 - 32) as usize], | ||
| _ => unimplemented!(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl ops::IndexMut<gimli::Register> for Context { | ||
| fn index_mut(&mut self, reg: Register) -> &mut usize { | ||
| match reg { | ||
| Register(0..=31) => &mut self.gp[reg.0 as usize], | ||
| #[cfg(target_feature = "single-float")] | ||
| Register(32..=63) => &mut self.fp[(reg.0 - 32) as usize], | ||
| _ => unimplemented!(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| macro_rules! code { | ||
| (save_gp) => { | ||
| " | ||
| sw $zero, 0x00($sp) | ||
| sw $s0, 0x40($sp) | ||
| sw $s1, 0x44($sp) | ||
| sw $s2, 0x48($sp) | ||
| sw $s3, 0x4C($sp) | ||
| sw $s4, 0x50($sp) | ||
| sw $s5, 0x54($sp) | ||
| sw $s6, 0x58($sp) | ||
| sw $s7, 0x5C($sp) | ||
| sw $k0, 0x68($sp) | ||
| sw $k1, 0x6C($sp) | ||
| sw $gp, 0x70($sp) | ||
| sw $t0, 0x74($sp) | ||
| sw $fp, 0x78($sp) | ||
| sw $ra, 0x7C($sp) | ||
| " | ||
| }; | ||
| (save_fp) => { | ||
| " | ||
| swc1 $f0, 0x80($sp) | ||
| swc1 $f1, 0x84($sp) | ||
| swc1 $f2, 0x88($sp) | ||
| swc1 $f3, 0x8C($sp) | ||
| swc1 $f4, 0x90($sp) | ||
| swc1 $f5, 0x94($sp) | ||
| swc1 $f6, 0x98($sp) | ||
| swc1 $f7, 0x9C($sp) | ||
| swc1 $f8, 0xA0($sp) | ||
| swc1 $f9, 0xA4($sp) | ||
| swc1 $f10, 0xA8($sp) | ||
| swc1 $f11, 0xAC($sp) | ||
| swc1 $f12, 0xB0($sp) | ||
| swc1 $f13, 0xB4($sp) | ||
| swc1 $f14, 0xB8($sp) | ||
| swc1 $f15, 0xBC($sp) | ||
| swc1 $f16, 0xC0($sp) | ||
| swc1 $f17, 0xC4($sp) | ||
| swc1 $f18, 0xC8($sp) | ||
| swc1 $f19, 0xCC($sp) | ||
| swc1 $f20, 0xD0($sp) | ||
| swc1 $f21, 0xD4($sp) | ||
| swc1 $f22, 0xD8($sp) | ||
| swc1 $f23, 0xDC($sp) | ||
| swc1 $f24, 0xE0($sp) | ||
| swc1 $f25, 0xE4($sp) | ||
| swc1 $f26, 0xE8($sp) | ||
| swc1 $f27, 0xEC($sp) | ||
| swc1 $f28, 0xF0($sp) | ||
| swc1 $f29, 0xF4($sp) | ||
| swc1 $f30, 0xF8($sp) | ||
| swc1 $f31, 0xFC($sp) | ||
| " | ||
| }; | ||
| (restore_gp) => { | ||
| " | ||
| lw $at, 0x04($a0) | ||
| lw $v0, 0x08($a0) | ||
| lw $v1, 0x0C($a0) | ||
| lw $a1, 0x14($a0) | ||
| lw $a2, 0x18($a0) | ||
| lw $a3, 0x1C($a0) | ||
| lw $t0, 0x20($a0) | ||
| lw $t1, 0x24($a0) | ||
| lw $t2, 0x28($a0) | ||
| lw $t3, 0x2C($a0) | ||
| lw $t4, 0x30($a0) | ||
| lw $t5, 0x34($a0) | ||
| lw $t6, 0x38($a0) | ||
| lw $t7, 0x3C($a0) | ||
| lw $s0, 0x40($a0) | ||
| lw $s1, 0x44($a0) | ||
| lw $s2, 0x48($a0) | ||
| lw $s3, 0x4C($a0) | ||
| lw $s4, 0x50($a0) | ||
| lw $s5, 0x54($a0) | ||
| lw $s6, 0x58($a0) | ||
| lw $s7, 0x5C($a0) | ||
| lw $t8, 0x60($a0) | ||
| lw $t9, 0x64($a0) | ||
| lw $k0, 0x68($a0) | ||
| lw $k1, 0x6C($a0) | ||
| lw $gp, 0x70($a0) | ||
| lw $sp, 0x74($a0) | ||
| lw $fp, 0x78($a0) | ||
| lw $ra, 0x7C($a0) | ||
| " | ||
| }; | ||
| (restore_fp) => { | ||
| " | ||
| lwc1 $f0, 0x80($a0) | ||
| lwc1 $f1, 0x84($a0) | ||
| lwc1 $f2, 0x88($a0) | ||
| lwc1 $f3, 0x8C($a0) | ||
| lwc1 $f4, 0x90($a0) | ||
| lwc1 $f5, 0x94($a0) | ||
| lwc1 $f6, 0x98($a0) | ||
| lwc1 $f7, 0x9C($a0) | ||
| lwc1 $f8, 0xA0($a0) | ||
| lwc1 $f9, 0xA4($a0) | ||
| lwc1 $f10, 0xA8($a0) | ||
| lwc1 $f11, 0xAC($a0) | ||
| lwc1 $f12, 0xB0($a0) | ||
| lwc1 $f13, 0xB4($a0) | ||
| lwc1 $f14, 0xB8($a0) | ||
| lwc1 $f15, 0xBC($a0) | ||
| lwc1 $f16, 0xC0($a0) | ||
| lwc1 $f17, 0xC4($a0) | ||
| lwc1 $f18, 0xC8($a0) | ||
| lwc1 $f19, 0xCC($a0) | ||
| lwc1 $f20, 0xD0($a0) | ||
| lwc1 $f21, 0xD4($a0) | ||
| lwc1 $f22, 0xD8($a0) | ||
| lwc1 $f23, 0xDC($a0) | ||
| lwc1 $f24, 0xE0($a0) | ||
| lwc1 $f25, 0xE4($a0) | ||
| lwc1 $f26, 0xE8($a0) | ||
| lwc1 $f27, 0xEC($a0) | ||
| lwc1 $f28, 0xF0($a0) | ||
| lwc1 $f29, 0xF4($a0) | ||
| lwc1 $f30, 0xF8($a0) | ||
| lwc1 $f31, 0xFC($a0) | ||
| " | ||
| }; | ||
| } | ||
|
|
||
| #[naked] | ||
| pub extern "C-unwind" fn save_context(f: extern "C" fn(&mut Context, *mut ()), ptr: *mut ()) { | ||
| unsafe { | ||
| #[cfg(target_feature = "single-float")] | ||
| asm!( | ||
| " | ||
| .set noreorder | ||
| .set nomacro | ||
| .set noat | ||
| move $t0, $sp | ||
| add $sp, $sp, -0x110 | ||
| sw $ra, 0x100($sp) | ||
| ", | ||
| code!(save_gp), | ||
| code!(save_fp), | ||
| " | ||
| move $t9, $a0 | ||
| move $a0, $sp | ||
| /* jalr must use $t9 in PIE code */ | ||
| jalr $t9 | ||
| nop | ||
| lw $ra, 0x100($sp) | ||
| add $sp, $sp, 0x110 | ||
| jr $ra | ||
| nop | ||
| .set at | ||
| .set macro | ||
| .set reorder | ||
| ", | ||
| options(noreturn) | ||
| ); | ||
| #[cfg(not(target_feature = "single-float"))] | ||
| asm!( | ||
| " | ||
| .set noreorder | ||
| .set nomacro | ||
| .set noat | ||
| move $t0, $sp | ||
| add $sp, $sp, -0x90 | ||
| sw $ra, 0x80($sp) | ||
| ", | ||
| code!(save_gp), | ||
| " | ||
| move $t9, $a0 | ||
| move $a0, $sp | ||
| /* jalr must use $t9 in PIE code */ | ||
| jalr $t9 | ||
| nop | ||
| lw $ra, 0x80($sp) | ||
| add $sp, $sp, 0x90 | ||
| jr $ra | ||
| nop | ||
| .set at | ||
| .set macro | ||
| .set reorder | ||
| ", | ||
| options(noreturn) | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| pub unsafe extern "C" fn restore_context(ctx: &Context) -> ! { | ||
| unsafe { | ||
| #[cfg(target_feature = "single-float")] | ||
| asm!( | ||
| " | ||
| .set noreorder | ||
| .set nomacro | ||
| .set noat | ||
| ", | ||
| code!(restore_fp), | ||
| code!(restore_gp), | ||
| " | ||
| lw $a0, 0x10($a0) | ||
| jr $ra | ||
| nop | ||
| .set at | ||
| .set macro | ||
| .set reorder | ||
| ", | ||
| in("a0") ctx, | ||
| options(noreturn) | ||
| ); | ||
| #[cfg(not(target_feature = "single-float"))] | ||
| asm!( | ||
| " | ||
| .set noreorder | ||
| .set nomacro | ||
| .set noat | ||
| ", | ||
| code!(restore_gp), | ||
| " | ||
| lw $a0, 0x10($a0) | ||
| jr $ra | ||
| nop | ||
| .set at | ||
| .set macro | ||
| .set reorder | ||
| ", | ||
| in("a0") ctx, | ||
| options(noreturn) | ||
| ); | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters