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https://github.com/brain-hackers/u-boot-brain
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![Yuri Tikhonov](/assets/img/avatar_default.png)
When compile u-boot with the 2.18 binutils the following warning messages for each object file in post/lib_ppc/fpu/ is produced at the linking stage: post/libpost.a(acc1.o) uses hard float, u-boot uses soft-float ... This is because of the fact that, in general, the soft-float and hard-float ABIs are incompatible; the 2.18 binutils do checking of the Tag_GNU_Power_ABI_FP attribute of the files to be linked, and produce the worning like above if these are not compatible. The incompatibility of ABIs is concerned only the float values: e.g. the soft-float ABI assumes the float argument passing in the pair of rX registers, and the hard-float ABI assumes passing of the float argument in the fX register. When we don't pass the float arguments between the functions compiled with different floatness, then such an application will work correctly. This is the case for the FPU POST: u-boot (compiled with soft-float) doesn't pass to (and doesn't get from) the FPU POST functions any floats; there are no functions exported from the post/lib_ppc/fpu/ objects which would work with float parameters/returns too. So, we can reassure the linker not to worry about the difference in ABI attributes of linking files just by setting the 'soft-float' attribute for the objects in post/lib_ppc/fpu. And this patch does this. Also, to avoid passing both soft- and hard-float options in CFLAGS when compiling the files from post/lib_ppc/fpu (which is OK, but looks rather dirty) this patch removes the soft-float string from CFLAGS in post/lib_ppc/fpu/Makefile. Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
124 lines
3.9 KiB
C
124 lines
3.9 KiB
C
/*
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* (C) Copyright 2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef _POST_H
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#define _POST_H
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#ifndef __ASSEMBLY__
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#include <common.h>
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#endif
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#ifdef CONFIG_POST
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#define POST_POWERON 0x01 /* test runs on power-on booting */
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#define POST_NORMAL 0x02 /* test runs on normal booting */
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#define POST_SLOWTEST 0x04 /* test is slow, enabled by key press */
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#define POST_POWERTEST 0x08 /* test runs after watchdog reset */
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#define POST_COLDBOOT 0x80 /* first boot after power-on */
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#define POST_ROM 0x0100 /* test runs in ROM */
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#define POST_RAM 0x0200 /* test runs in RAM */
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#define POST_MANUAL 0x0400 /* test runs on diag command */
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#define POST_REBOOT 0x0800 /* test may cause rebooting */
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#define POST_PREREL 0x1000 /* test runs before relocation */
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#define POST_CRITICAL 0x2000 /* Use failbootcmd if test failed */
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#define POST_STOP 0x4000 /* Interrupt POST sequence on fail */
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#define POST_MEM (POST_RAM | POST_ROM)
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#define POST_ALWAYS (POST_NORMAL | \
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POST_SLOWTEST | \
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POST_MANUAL | \
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POST_POWERON )
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#define POST_FAIL_SAVE 0x80
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#ifndef __ASSEMBLY__
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struct post_test {
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char *name;
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char *cmd;
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char *desc;
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int flags;
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int (*test) (int flags);
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int (*init_f) (void);
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void (*reloc) (void);
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unsigned long testid;
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};
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int post_init_f (void);
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void post_bootmode_init (void);
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int post_bootmode_get (unsigned int * last_test);
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void post_bootmode_clear (void);
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void post_output_backlog ( void );
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int post_run (char *name, int flags);
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int post_info (char *name);
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int post_log (char *format, ...);
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void post_reloc (void);
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unsigned long post_time_ms (unsigned long base);
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extern struct post_test post_list[];
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extern unsigned int post_list_size;
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extern int post_hotkeys_pressed(void);
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/*
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* If GCC is configured to use a version of GAS that supports
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* the .gnu_attribute directive, it will use that directive to
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* record certain properties of the output code.
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* This feature is new to GCC 4.3.0.
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* .gnu_attribute is new to GAS 2.18.
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*/
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#if (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
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/* Tag_GNU_Power_ABI_FP/soft-float */
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#define GNU_FPOST_ATTR asm(".gnu_attribute 4, 2");
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#else
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#define GNU_FPOST_ATTR
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#endif /* __GNUC__ */
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#endif /* __ASSEMBLY__ */
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#define CONFIG_SYS_POST_RTC 0x00000001
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#define CONFIG_SYS_POST_WATCHDOG 0x00000002
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#define CONFIG_SYS_POST_MEMORY 0x00000004
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#define CONFIG_SYS_POST_CPU 0x00000008
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#define CONFIG_SYS_POST_I2C 0x00000010
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#define CONFIG_SYS_POST_CACHE 0x00000020
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#define CONFIG_SYS_POST_UART 0x00000040
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#define CONFIG_SYS_POST_ETHER 0x00000080
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#define CONFIG_SYS_POST_SPI 0x00000100
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#define CONFIG_SYS_POST_USB 0x00000200
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#define CONFIG_SYS_POST_SPR 0x00000400
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#define CONFIG_SYS_POST_SYSMON 0x00000800
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#define CONFIG_SYS_POST_DSP 0x00001000
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#define CONFIG_SYS_POST_OCM 0x00002000
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#define CONFIG_SYS_POST_FPU 0x00004000
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#define CONFIG_SYS_POST_ECC 0x00008000
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#define CONFIG_SYS_POST_BSPEC1 0x00010000
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#define CONFIG_SYS_POST_BSPEC2 0x00020000
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#define CONFIG_SYS_POST_BSPEC3 0x00040000
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#define CONFIG_SYS_POST_BSPEC4 0x00080000
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#define CONFIG_SYS_POST_BSPEC5 0x00100000
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#define CONFIG_SYS_POST_CODEC 0x00200000
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#endif /* CONFIG_POST */
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#endif /* _POST_H */
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