17b251a290
Using the linker script to fix an issue where some archs call the
function tracer with just the ip (instruction pointer) and pip (parent
instruction pointer) where as more up to date archs also pass in the
associated ftrace_ops and the ftrace_regs pointer, the generic code
will be called either with two parameters or four. To avoid any C
undefined behavior of calling two parameters to four or four to two
parameter function, two functions are created, where a preprocessor
macro uses the one that matches the architecture. As the function
pointers for them may be different, a typecast is used. But this
triggers issues with newer compilers that will fail due to -Werror.
A linker trick is now used to map the generic function to the function
that is used (note the generic function is only used to set the default
function callback). The linker trick defines ftrace_ops_list_func (the
generic function) to arch_ftrace_ops_list_func (the arch defined one).
Link: https://lore.kernel.org/all/20200617165616.52241bde@oasis.local.home/
But this fails sh arch because their linker script is included in their
compressed image that does not define arch_ftrace_ops_list_func at all
sh4-linux-ld:arch/sh/boot/compressed/../../kernel/vmlinux.lds:32: undefined symbol `arch_ftrace_ops_list_func' referenced in expression
Included a stub by that name in the misc.c to allow the code to
compile and link, even though it's not used.
This is similar to what was done for ftrace_stub:
b83b43ffc6 ("fgraph: Fix function type mismatches of
ftrace_graph_return using ftrace_stub")
Link: https://lkml.kernel.org/r/20211021221627.5d7270de@rorschach.local.home
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: linux-sh@vger.kernel.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
147 lines
2.8 KiB
C
147 lines
2.8 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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void arch_ftrace_ops_list_func(void)
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{
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}
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#define stackalign 4
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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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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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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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