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| author | Maciej W. Rozycki <macro@codesourcery.com> | 2013-02-27 23:45:07 +0000 |
|---|---|---|
| committer | Maciej W. Rozycki <macro@codesourcery.com> | 2013-02-27 23:45:07 +0000 |
| commit | 43301bd3c281036ba97eef384c9340cc7b6130d3 (patch) | |
| tree | 263f0cc7e01c33c72e626480a52b2bfc1dce78f0 /ports/sysdeps/mips/start.S | |
| parent | 85bd816a603a437aedeb688a60a3e0dba4439c50 (diff) | |
| download | glibc-43301bd3c281036ba97eef384c9340cc7b6130d3.tar.gz glibc-43301bd3c281036ba97eef384c9340cc7b6130d3.tar.xz glibc-43301bd3c281036ba97eef384c9340cc7b6130d3.zip | |
Add support for building as MIPS16 code.
Diffstat (limited to 'ports/sysdeps/mips/start.S')
| -rw-r--r-- | ports/sysdeps/mips/start.S | 80 |
1 files changed, 72 insertions, 8 deletions
diff --git a/ports/sysdeps/mips/start.S b/ports/sysdeps/mips/start.S index 82b7a229f3..83a68959a3 100644 --- a/ports/sysdeps/mips/start.S +++ b/ports/sysdeps/mips/start.S @@ -74,14 +74,15 @@ .text .globl ENTRY_POINT .type ENTRY_POINT,@function +#ifndef __mips16 ENTRY_POINT: -#ifdef __PIC__ +# ifdef __PIC__ SETUP_GPX($0) SETUP_GPX64($25,$0) -#else +# else PTR_LA $28, _gp /* Setup GP correctly if we're non-PIC. */ move $31, $0 -#endif +# endif PTR_LA $4, main /* main */ PTR_L $5, 0($29) /* argc */ @@ -92,22 +93,85 @@ ENTRY_POINT: on o32 and quad words (16 bytes) on n32 and n64. */ and $29, -2 * SZREG -#if _MIPS_SIM == _ABIO32 +# if _MIPS_SIM == _ABIO32 PTR_SUBIU $29, 32 -#endif +# endif PTR_LA $7, __libc_csu_init /* init */ PTR_LA $8, __libc_csu_fini -#if _MIPS_SIM == _ABIO32 +# if _MIPS_SIM == _ABIO32 PTR_S $8, 16($29) /* fini */ PTR_S $2, 20($29) /* rtld_fini */ PTR_S $29, 24($29) /* stack_end */ -#else +# else move $9, $2 /* rtld_fini */ move $10, $29 /* stack_end */ -#endif +# endif jal __libc_start_main hlt: b hlt /* Crash if somehow it does return. */ +#elif _MIPS_SIM == _ABIO32 /* __mips16 */ + /* MIPS16 entry point. */ + .set mips16 +ENTRY_POINT: +# ifdef __PIC__ + li $3, %hi(_gp_disp) + addiu $4, $pc, %lo(_gp_disp) + sll $3, 16 + addu $3, $4 + move $gp, $3 +# else + li $3, %hi(_gp) + sll $3, 16 + addiu $3, %lo(_gp) + move $gp, $3 +# endif + /* Tie end of stack frames. */ + li $4, 0 + move $31, $4 + /* Create new SP value in $7, including alignment. */ + li $4, 2 * SZREG + neg $4, $4 + move $7, $sp + and $7, $4 + addiu $7, -32 + /* Load arguments with original SP. */ + lw $5, 0($sp) + addiu $6, $sp, PTRSIZE + /* Update SP. */ + move $sp, $7 + /* Lay out last arguments, and call __libc_start_main(). */ +# ifdef __PIC__ + sw $7, 24($sp) /* stack_end */ + lw $4, %got(__libc_csu_fini)($3) + lw $7, %got(__libc_csu_init)($3) /* init */ + sw $4, 16($sp) /* fini */ + lw $4, %got(main)($3) /* main */ + lw $3, %call16(__libc_start_main)($3) + sw $2, 20($sp) /* rtld_fini */ + move $25, $3 + jalr $3 +# else + lw $4, 1f + sw $7, 24($sp) /* stack_end */ + lw $7, 2f /* init */ + sw $4, 16($sp) /* fini */ + lw $4, 3f /* main */ + sw $2, 20($sp) /* rtld_fini */ + jal __libc_start_main +# endif +hlt: b hlt /* Crash if somehow it does return. */ +# ifndef __PIC__ + .align 2 +1: .word __libc_csu_fini +2: .word __libc_csu_init +3: .word main +# endif + +#else /* __mips16 && _MIPS_SIM != _ABIO32 */ +# error "MIPS16 support for N32/N64 not implemented" + +#endif /* __mips16 */ + /* Define a symbol for the first piece of initialized data. */ .data .globl __data_start |