diff options
Diffstat (limited to 'libffi/src/arm/sysv.S')
| -rw-r--r-- | libffi/src/arm/sysv.S | 230 |
1 files changed, 156 insertions, 74 deletions
diff --git a/libffi/src/arm/sysv.S b/libffi/src/arm/sysv.S index 0e4186114a9..c3471a8a2ff 100644 --- a/libffi/src/arm/sysv.S +++ b/libffi/src/arm/sysv.S @@ -40,87 +40,169 @@ #endif #define ENTRY(x) .globl CNAME(x); .type CNAME(x),%function; CNAME(x): #endif + +#ifdef __ELF__ +#define LSYM(x) .x +#else +#define LSYM(x) x +#endif + +/* We need a better way of testing for this, but for now, this is all + we can do. */ +@ This selects the minimum architecture level required. +#define __ARM_ARCH__ 3 + +#if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) +# undef __ARM_ARCH__ +# define __ARM_ARCH__ 4 +#endif + +#if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) \ + || defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \ + || defined(__ARM_ARCH_5TEJ__) +# undef __ARM_ARCH__ +# define __ARM_ARCH__ 5 +#endif + +#if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \ + || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \ + || defined(__ARM_ARCH_6ZK__) +# undef __ARM_ARCH__ +# define __ARM_ARCH__ 6 +#endif + +#if __ARM_ARCH__ >= 5 +# define call_reg(x) blx x +#elif defined (__ARM_ARCH_4T__) +# define call_reg(x) mov lr, pc ; bx x +# if defined(__thumb__) || defined(__THUMB_INTERWORK__) +# define __INTERWORKING__ +# endif +#else +# define call_reg(x) mov lr, pc ; mov pc, x +#endif + +#if defined(__thumb__) && !defined(__THUMB_INTERWORK__) +.macro ARM_FUNC_START name + .text + .align 0 + .thumb + .thumb_func + ENTRY(\name) + bx pc + nop + .arm +/* A hook to tell gdb that we've switched to ARM mode. Also used to call + directly from other local arm routines. */ +_L__\name: +.endm +#else +.macro ARM_FUNC_START name + .text + .align 0 + .arm + ENTRY(\name) +.endm +#endif + +.macro RETLDM regs=, cond=, dirn=ia +#if defined (__INTERWORKING__) + .ifc "\regs","" + ldr\cond lr, [sp], #4 + .else + ldm\cond\dirn sp!, {\regs, lr} + .endif + bx\cond lr +#else + .ifc "\regs","" + ldr\cond pc, [sp], #4 + .else + ldm\cond\dirn sp!, {\regs, pc} + .endif +#endif +.endm + + + @ r0: ffi_prep_args + @ r1: &ecif + @ r2: cif->bytes + @ r3: fig->flags + @ sp+0: ecif.rvalue + @ sp+4: fn + + @ This assumes we are using gas. +ARM_FUNC_START ffi_call_SYSV + @ Save registers + stmfd sp!, {r0-r3, fp, lr} + mov fp, sp + + @ Make room for all of the new args. + sub sp, fp, r2 + + @ Place all of the ffi_prep_args in position + mov ip, r0 + mov r0, sp + @ r1 already set + + @ Call ffi_prep_args(stack, &ecif) + call_reg(ip) + + @ move first 4 parameters in registers + ldmia sp, {r0-r3} + + @ and adjust stack + ldr ip, [fp, #8] + cmp ip, #16 + movhs ip, #16 + add sp, sp, ip + + @ call (fn) (...) + ldr ip, [fp, #28] + call_reg(ip) -.text - - # a1: ffi_prep_args - # a2: &ecif - # a3: cif->bytes - # a4: fig->flags - # sp+0: ecif.rvalue - # sp+4: fn - - # This assumes we are using gas. -ENTRY(ffi_call_SYSV) - # Save registers - stmfd sp!, {a1-a4, fp, lr} - mov fp, sp - - # Make room for all of the new args. - sub sp, fp, a3 - - # Place all of the ffi_prep_args in position - mov ip, a1 - mov a1, sp - # a2 already set - - # And call - mov lr, pc - mov pc, ip - - # move first 4 parameters in registers - ldr a1, [sp, #0] - ldr a2, [sp, #4] - ldr a3, [sp, #8] - ldr a4, [sp, #12] - - # and adjust stack - ldr ip, [fp, #8] - cmp ip, #16 - movge ip, #16 - add sp, sp, ip - - # call function - mov lr, pc - ldr pc, [fp, #28] - - # Remove the space we pushed for the args - mov sp, fp - - # Load a3 with the pointer to storage for the return value - ldr a3, [sp, #24] - - # Load a4 with the return type code - ldr a4, [sp, #12] - - # If the return value pointer is NULL, assume no return value. - cmp a3, #0 - beq epilogue - -# return INT - cmp a4, #FFI_TYPE_INT - streq a1, [a3] - beq epilogue - -# return FLOAT - cmp a4, #FFI_TYPE_FLOAT + @ Remove the space we pushed for the args + mov sp, fp + + @ Load r2 with the pointer to storage for the return value + ldr r2, [sp, #24] + + @ Load r3 with the return type code + ldr r3, [sp, #12] + + @ If the return value pointer is NULL, assume no return value. + cmp r2, #0 + beq LSYM(Lepilogue) + +@ return INT + cmp r3, #FFI_TYPE_INT #ifdef __SOFTFP__ - streq a1, [a3] -#else - stfeqs f0, [a3] + cmpne r3, #FFI_TYPE_FLOAT #endif - beq epilogue + streq r0, [r2] + beq LSYM(Lepilogue) -# return DOUBLE or LONGDOUBLE - cmp a4, #FFI_TYPE_DOUBLE + @ return INT64 + cmp r3, #FFI_TYPE_SINT64 #ifdef __SOFTFP__ - stmeqia a3, {a1, a2} -#else - stfeqd f0, [a3] + cmpne r3, #FFI_TYPE_DOUBLE +#endif + stmeqia r2, {r0, r1} + +#ifndef __SOFTFP__ + beq LSYM(Lepilogue) + +@ return FLOAT + cmp r3, #FFI_TYPE_FLOAT + stfeqs f0, [r2] + beq LSYM(Lepilogue) + +@ return DOUBLE or LONGDOUBLE + cmp r3, #FFI_TYPE_DOUBLE + stfeqd f0, [r2] #endif -epilogue: - ldmfd sp!, {a1-a4, fp, pc} +LSYM(Lepilogue): + RETLDM "r0-r3,fp" .ffi_call_SYSV_end: .size CNAME(ffi_call_SYSV),.ffi_call_SYSV_end-CNAME(ffi_call_SYSV) |
