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powerpc: Use a function for reading instructions

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Prefixed instructions will mean there are instructions of different
length. As a result dereferencing a pointer to an instruction will not
necessarily give the desired result. Introduce a function for reading
instructions from memory into the instruction data type.

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Alistair Popple <alistair@popple.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-13-jniethe5@gmail.com
This commit is contained in:
Jordan Niethe
2020-05-06 13:40:32 +10:00
committed by Michael Ellerman
parent 94afd069d9
commit f8faaffaa7
9 changed files with 33 additions and 26 deletions
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4
arch/powerpc/kernel/trace/ftrace.c
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@@ -848,7 +848,7 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
struct ppc_inst old, new;
int ret;
old = *(struct ppc_inst *)&ftrace_call;
old = ppc_inst_read((struct ppc_inst *)&ftrace_call);
new = ftrace_call_replace(ip, (unsigned long)func, 1);
ret = ftrace_modify_code(ip, old, new);
@@ -856,7 +856,7 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
/* Also update the regs callback function */
if (!ret) {
ip = (unsigned long)(&ftrace_regs_call);
old = *(struct ppc_inst *)&ftrace_regs_call;
old = ppc_inst_read((struct ppc_inst *)&ftrace_regs_call);
new = ftrace_call_replace(ip, (unsigned long)func, 1);
ret = ftrace_modify_code(ip, old, new);
}