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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b83b43ffc6
The C compiler is allowing more checks to make sure that function pointers are assigned to the correct prototype function. Unfortunately, the function graph tracer uses a special name with its assigned ftrace_graph_return function pointer that maps to a stub function used by the function tracer (ftrace_stub). The ftrace_graph_return variable is compared to the ftrace_stub in some archs to know if the function graph tracer is enabled or not. This means we can not just simply create a new function stub that compares it without modifying all the archs. Instead, have the linker script create a function_graph_stub that maps to ftrace_stub, and this way we can define the prototype for it to match the prototype of ftrace_graph_return, and make the compiler checks all happy! Link: http://lkml.kernel.org/r/20191015090055.789a0aed@gandalf.local.home Cc: linux-sh@vger.kernel.org Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Rich Felker <dalias@libc.org> Reported-by: Sami Tolvanen <samitolvanen@google.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
152 lines
2.9 KiB
C
152 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* arch/sh/boot/compressed/misc.c
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*
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* This is a collection of several routines from gzip-1.0.3
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* adapted for Linux.
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*
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* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
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*
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* Adapted for SH by Stuart Menefy, Aug 1999
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*
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* Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
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*/
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#include <linux/uaccess.h>
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#include <asm/addrspace.h>
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#include <asm/page.h>
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/*
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* gzip declarations
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*/
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#define STATIC static
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#undef memset
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#undef memcpy
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#define memzero(s, n) memset ((s), 0, (n))
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/* cache.c */
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#define CACHE_ENABLE 0
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#define CACHE_DISABLE 1
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int cache_control(unsigned int command);
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extern char input_data[];
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extern int input_len;
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static unsigned char *output;
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static void error(char *m);
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int puts(const char *);
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extern int _text; /* Defined in vmlinux.lds.S */
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extern int _end;
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static unsigned long free_mem_ptr;
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static unsigned long free_mem_end_ptr;
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#ifdef CONFIG_HAVE_KERNEL_BZIP2
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#define HEAP_SIZE 0x400000
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#else
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#define HEAP_SIZE 0x10000
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#endif
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#ifdef CONFIG_KERNEL_GZIP
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#include "../../../../lib/decompress_inflate.c"
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#endif
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#ifdef CONFIG_KERNEL_BZIP2
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#include "../../../../lib/decompress_bunzip2.c"
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#endif
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#ifdef CONFIG_KERNEL_LZMA
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#include "../../../../lib/decompress_unlzma.c"
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#endif
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#ifdef CONFIG_KERNEL_XZ
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#include "../../../../lib/decompress_unxz.c"
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#endif
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#ifdef CONFIG_KERNEL_LZO
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#include "../../../../lib/decompress_unlzo.c"
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#endif
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int puts(const char *s)
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{
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/* This should be updated to use the sh-sci routines */
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return 0;
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}
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void* memset(void* s, int c, size_t n)
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{
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int i;
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char *ss = (char*)s;
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for (i=0;i<n;i++) ss[i] = c;
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return s;
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}
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void* memcpy(void* __dest, __const void* __src,
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size_t __n)
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{
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int i;
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char *d = (char *)__dest, *s = (char *)__src;
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for (i=0;i<__n;i++) d[i] = s[i];
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return __dest;
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}
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static void error(char *x)
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{
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puts("\n\n");
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puts(x);
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puts("\n\n -- System halted");
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while(1); /* Halt */
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}
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const unsigned long __stack_chk_guard = 0x000a0dff;
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void __stack_chk_fail(void)
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{
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error("stack-protector: Kernel stack is corrupted\n");
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}
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/* Needed because vmlinux.lds.h references this */
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void ftrace_stub(void)
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{
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}
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#ifdef CONFIG_SUPERH64
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#define stackalign 8
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#else
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#define stackalign 4
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#endif
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#define STACK_SIZE (4096)
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long __attribute__ ((aligned(stackalign))) user_stack[STACK_SIZE];
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long *stack_start = &user_stack[STACK_SIZE];
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void decompress_kernel(void)
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{
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unsigned long output_addr;
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#ifdef CONFIG_SUPERH64
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output_addr = (CONFIG_MEMORY_START + 0x2000);
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#else
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output_addr = __pa((unsigned long)&_text+PAGE_SIZE);
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#if defined(CONFIG_29BIT)
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output_addr |= P2SEG;
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#endif
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#endif
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output = (unsigned char *)output_addr;
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free_mem_ptr = (unsigned long)&_end;
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free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
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puts("Uncompressing Linux... ");
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cache_control(CACHE_ENABLE);
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__decompress(input_data, input_len, NULL, NULL, output, 0, NULL, error);
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cache_control(CACHE_DISABLE);
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puts("Ok, booting the kernel.\n");
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}
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