hw: ease syscall backends and prepare them for -O0
Previously we used to many registers in syscalls with much arguments to build with optimization level O0. Additionally this fix fastens the userland backend of syscalls.
This commit is contained in:
Martin Stein
Norman Feske
parent
724efcb00c
commit
6a2546d7e9
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@ -1,6 +1,6 @@
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/*
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* \brief Interface between kernel and userland
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* \author Martin stein
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* \author Martin Stein
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* \date 2011-11-30
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*/
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@ -17,91 +17,59 @@
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using namespace Kernel;
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/**********************************************************************
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** Inline assembly templates for kernel calls with 1 to 6 arguments **
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**********************************************************************/
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#define CALL_6_ASM_OPS \
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"mov r5, #0 \n" \
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"add r5, %[arg_5] \n" \
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CALL_5_ASM_OPS
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#define CALL_5_ASM_OPS \
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"mov r4, #0 \n" \
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"add r4, %[arg_4] \n" \
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CALL_4_ASM_OPS
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#define CALL_4_ASM_OPS \
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"mov r3, #0 \n" \
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"add r3, %[arg_3] \n" \
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CALL_3_ASM_OPS
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#define CALL_3_ASM_OPS \
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"mov r2, #0 \n" \
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"add r2, %[arg_2] \n" \
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CALL_2_ASM_OPS
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#define CALL_2_ASM_OPS \
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"mov r1, #0 \n" \
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"add r1, %[arg_1] \n" \
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CALL_1_ASM_OPS
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#define CALL_1_ASM_OPS \
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"mov r0, #0 \n" \
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"add r0, %[arg_0] \n" \
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"swi 0 \n" \
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"mov %[result], #0 \n" \
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"add %[result], r0 "
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/****************************************************************************
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** Inline assembly "writeable" tpl-args for kernel calls with 1 to 6 args **
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****************************************************************************/
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#define CALL_6_ASM_WRITE [arg_5] "+r" (arg_5), CALL_5_ASM_WRITE
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#define CALL_5_ASM_WRITE [arg_4] "+r" (arg_4), CALL_4_ASM_WRITE
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#define CALL_4_ASM_WRITE [arg_3] "+r" (arg_3), CALL_3_ASM_WRITE
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#define CALL_3_ASM_WRITE [arg_2] "+r" (arg_2), CALL_2_ASM_WRITE
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#define CALL_2_ASM_WRITE [arg_1] "+r" (arg_1), CALL_1_ASM_WRITE
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#define CALL_1_ASM_WRITE \
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[arg_0] "+r" (arg_0), \
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[result] "+r" (result)
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/**************************************************************************
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** Inline assembly clobber lists for kernel calls with 1 to 6 arguments **
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**************************************************************************/
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#define CALL_6_ASM_CLOBBER "r5", CALL_5_ASM_CLOBBER
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#define CALL_5_ASM_CLOBBER "r4", CALL_4_ASM_CLOBBER
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#define CALL_4_ASM_CLOBBER "r3", CALL_3_ASM_CLOBBER
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#define CALL_3_ASM_CLOBBER "r2", CALL_2_ASM_CLOBBER
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#define CALL_2_ASM_CLOBBER "r1", CALL_1_ASM_CLOBBER
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#define CALL_1_ASM_CLOBBER "r0"
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/************************************
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** Calls with 1 to 6 arguments **
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** Helper macros for kernel calls **
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************************************/
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#define CALL_1_FILL_ARG_REGS \
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register Call_arg arg_0_reg asm("r0") = arg_0;
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#define CALL_2_FILL_ARG_REGS \
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CALL_1_FILL_ARG_REGS \
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register Call_arg arg_1_reg asm("r1") = arg_1;
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#define CALL_3_FILL_ARG_REGS \
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CALL_2_FILL_ARG_REGS \
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register Call_arg arg_2_reg asm("r2") = arg_2;
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#define CALL_4_FILL_ARG_REGS \
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CALL_3_FILL_ARG_REGS \
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register Call_arg arg_3_reg asm("r3") = arg_3;
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#define CALL_5_FILL_ARG_REGS \
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CALL_4_FILL_ARG_REGS \
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register Call_arg arg_4_reg asm("r4") = arg_4;
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#define CALL_6_FILL_ARG_REGS \
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CALL_5_FILL_ARG_REGS \
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register Call_arg arg_5_reg asm("r5") = arg_5;
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#define CALL_1_SWI "swi 0\n" : "+r" (arg_0_reg)
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#define CALL_2_SWI CALL_1_SWI: "r" (arg_1_reg)
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#define CALL_3_SWI CALL_2_SWI, "r" (arg_2_reg)
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#define CALL_4_SWI CALL_3_SWI, "r" (arg_3_reg)
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#define CALL_5_SWI CALL_4_SWI, "r" (arg_4_reg)
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#define CALL_6_SWI CALL_5_SWI, "r" (arg_5_reg)
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/******************
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** Kernel calls **
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******************/
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Call_ret Kernel::call(Call_arg arg_0)
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{
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Call_ret result = 0;
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asm volatile(CALL_1_ASM_OPS
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: CALL_1_ASM_WRITE
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:: CALL_1_ASM_CLOBBER);
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return result;
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CALL_1_FILL_ARG_REGS
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asm volatile(CALL_1_SWI);
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return arg_0_reg;
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}
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Call_ret Kernel::call(Call_arg arg_0,
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Call_arg arg_1)
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{
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Call_ret result = 0;
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asm volatile(CALL_2_ASM_OPS
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: CALL_2_ASM_WRITE
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:: CALL_2_ASM_CLOBBER);
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return result;
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CALL_2_FILL_ARG_REGS
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asm volatile(CALL_2_SWI);
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return arg_0_reg;
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}
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@ -109,11 +77,9 @@ Call_ret Kernel::call(Call_arg arg_0,
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Call_arg arg_1,
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Call_arg arg_2)
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{
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Call_ret result = 0;
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asm volatile(CALL_3_ASM_OPS
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: CALL_3_ASM_WRITE
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:: CALL_3_ASM_CLOBBER);
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return result;
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CALL_3_FILL_ARG_REGS
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asm volatile(CALL_3_SWI);
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return arg_0_reg;
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}
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@ -122,11 +88,9 @@ Call_ret Kernel::call(Call_arg arg_0,
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Call_arg arg_2,
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Call_arg arg_3)
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{
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Call_ret result = 0;
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asm volatile(CALL_4_ASM_OPS
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: CALL_4_ASM_WRITE
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:: CALL_4_ASM_CLOBBER);
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return result;
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CALL_4_FILL_ARG_REGS
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asm volatile(CALL_4_SWI);
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return arg_0_reg;
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}
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@ -136,11 +100,9 @@ Call_ret Kernel::call(Call_arg arg_0,
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Call_arg arg_3,
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Call_arg arg_4)
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{
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Call_ret result = 0;
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asm volatile(CALL_5_ASM_OPS
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: CALL_5_ASM_WRITE
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:: CALL_5_ASM_CLOBBER);
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return result;
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CALL_5_FILL_ARG_REGS
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asm volatile(CALL_5_SWI);
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return arg_0_reg;
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}
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@ -151,11 +113,9 @@ Call_ret Kernel::call(Call_arg arg_0,
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Call_arg arg_4,
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Call_arg arg_5)
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{
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Call_ret result = 0;
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asm volatile(CALL_6_ASM_OPS
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: CALL_6_ASM_WRITE
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:: CALL_6_ASM_CLOBBER);
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return result;
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CALL_6_FILL_ARG_REGS
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asm volatile(CALL_6_SWI);
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return arg_0_reg;
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}
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