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s390/tracing: pass struct ftrace_regs to ftrace_trace_function

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ftrace_trace_function expects a struct ftrace_regs, but the s390
architecure code passes struct pt_regs. This isn't a problem with the
current code because struct ftrace_regs contains only one member:
struct pt_regs. To avoid issues in the future this should be fixed.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2023-07-17 10:14:32 +02:00 committed by Heiko Carstens
parent 5216d853cb
commit e3123dfb53
2 changed files with 34 additions and 25 deletions
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2
arch/s390/kernel/asm-offsets.c
View file

@ -184,5 +184,7 @@ int main(void)
OFFSET(__FGRAPH_RET_FP, fgraph_ret_regs, fp);
DEFINE(__FGRAPH_RET_SIZE, sizeof(struct fgraph_ret_regs));
#endif
OFFSET(__FTRACE_REGS_PT_REGS, ftrace_regs, regs);
DEFINE(__FTRACE_REGS_SIZE, sizeof(struct ftrace_regs));
return 0;
}

57
arch/s390/kernel/mcount.S
View file

@ -12,12 +12,19 @@
#include <asm/export.h>
#define STACK_FRAME_SIZE (STACK_FRAME_OVERHEAD + __PT_SIZE)
#define STACK_PTREGS (STACK_FRAME_OVERHEAD)
#define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
#define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW)
#define STACK_PTREGS_ORIG_GPR2 (STACK_PTREGS + __PT_ORIG_GPR2)
#define STACK_PTREGS_FLAGS (STACK_PTREGS + __PT_FLAGS)
#define STACK_FRAME_SIZE_PTREGS (STACK_FRAME_OVERHEAD + __PT_SIZE)
#define STACK_PTREGS (STACK_FRAME_OVERHEAD)
#define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
#define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW)
#define STACK_FRAME_SIZE_FREGS (STACK_FRAME_OVERHEAD + __FTRACE_REGS_SIZE)
#define STACK_FREGS (STACK_FRAME_OVERHEAD)
#define STACK_FREGS_PTREGS (STACK_FRAME_OVERHEAD + __FTRACE_REGS_PT_REGS)
#define STACK_FREGS_PTREGS_GPRS (STACK_FREGS_PTREGS + __PT_GPRS)
#define STACK_FREGS_PTREGS_PSW (STACK_FREGS_PTREGS + __PT_PSW)
#define STACK_FREGS_PTREGS_ORIG_GPR2 (STACK_FREGS_PTREGS + __PT_ORIG_GPR2)
#define STACK_FREGS_PTREGS_FLAGS (STACK_FREGS_PTREGS + __PT_FLAGS)
/* packed stack: allocate just enough for r14, r15 and backchain */
#define TRACED_FUNC_FRAME_SIZE 24
@ -53,23 +60,23 @@ SYM_CODE_END(ftrace_stub_direct_tramp)
stg %r1,__SF_BACKCHAIN(%r15)
stg %r0,(__SF_GPRS+8*8)(%r15)
stg %r15,(__SF_GPRS+9*8)(%r15)
# allocate pt_regs and stack frame for ftrace_trace_function
aghi %r15,-STACK_FRAME_SIZE
stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15)
xc STACK_PTREGS_ORIG_GPR2(8,%r15),STACK_PTREGS_ORIG_GPR2(%r15)
# allocate ftrace_regs and stack frame for ftrace_trace_function
aghi %r15,-STACK_FRAME_SIZE_FREGS
stg %r1,(STACK_FREGS_PTREGS_GPRS+15*8)(%r15)
xc STACK_FREGS_PTREGS_ORIG_GPR2(8,%r15),STACK_FREGS_PTREGS_ORIG_GPR2(%r15)
.if \allregs == 1
stg %r14,(STACK_PTREGS_PSW)(%r15)
mvghi STACK_PTREGS_FLAGS(%r15),_PIF_FTRACE_FULL_REGS
stg %r14,(STACK_FREGS_PTREGS_PSW)(%r15)
mvghi STACK_FREGS_PTREGS_FLAGS(%r15),_PIF_FTRACE_FULL_REGS
.else
xc STACK_PTREGS_FLAGS(8,%r15),STACK_PTREGS_FLAGS(%r15)
xc STACK_FREGS_PTREGS_FLAGS(8,%r15),STACK_FREGS_PTREGS_FLAGS(%r15)
.endif
lg %r14,(__SF_GPRS+8*8)(%r1) # restore original return address
aghi %r1,-TRACED_FUNC_FRAME_SIZE
stg %r1,__SF_BACKCHAIN(%r15)
stg %r0,(STACK_PTREGS_PSW+8)(%r15)
stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
stg %r0,(STACK_FREGS_PTREGS_PSW+8)(%r15)
stmg %r2,%r14,(STACK_FREGS_PTREGS_GPRS+2*8)(%r15)
.endm
SYM_CODE_START(ftrace_regs_caller)
@ -96,30 +103,30 @@ SYM_CODE_START(ftrace_common)
lg %r1,0(%r1)
#endif
lgr %r3,%r14
la %r5,STACK_PTREGS(%r15)
la %r5,STACK_FREGS(%r15)
BASR_EX %r14,%r1
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
# The j instruction gets runtime patched to a nop instruction.
# See ftrace_enable_ftrace_graph_caller.
SYM_INNER_LABEL(ftrace_graph_caller, SYM_L_GLOBAL)
j .Lftrace_graph_caller_end
lmg %r2,%r3,(STACK_PTREGS_GPRS+14*8)(%r15)
lg %r4,(STACK_PTREGS_PSW+8)(%r15)
lmg %r2,%r3,(STACK_FREGS_PTREGS_GPRS+14*8)(%r15)
lg %r4,(STACK_FREGS_PTREGS_PSW+8)(%r15)
brasl %r14,prepare_ftrace_return
stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
stg %r2,(STACK_FREGS_PTREGS_GPRS+14*8)(%r15)
.Lftrace_graph_caller_end:
#endif
lg %r0,(STACK_PTREGS_PSW+8)(%r15)
lg %r0,(STACK_FREGS_PTREGS_PSW+8)(%r15)
#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
ltg %r1,STACK_PTREGS_ORIG_GPR2(%r15)
ltg %r1,STACK_FREGS_PTREGS_ORIG_GPR2(%r15)
locgrz %r1,%r0
#else
lg %r1,STACK_PTREGS_ORIG_GPR2(%r15)
lg %r1,STACK_FREGS_PTREGS_ORIG_GPR2(%r15)
ltgr %r1,%r1
jnz 0f
lgr %r1,%r0
#endif
0: lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
0: lmg %r2,%r15,(STACK_FREGS_PTREGS_GPRS+2*8)(%r15)
BR_EX %r1
SYM_CODE_END(ftrace_common)
@ -164,11 +171,11 @@ SYM_CODE_END(ftrace_shared_hotpatch_trampoline_exrl)
SYM_CODE_START(arch_rethook_trampoline)
stg %r14,(__SF_GPRS+8*8)(%r15)
lay %r15,-STACK_FRAME_SIZE(%r15)
lay %r15,-STACK_FRAME_SIZE_PTREGS(%r15)
stmg %r0,%r14,STACK_PTREGS_GPRS(%r15)
# store original stack pointer in backchain and pt_regs
lay %r7,STACK_FRAME_SIZE(%r15)
lay %r7,STACK_FRAME_SIZE_PTREGS(%r15)
stg %r7,__SF_BACKCHAIN(%r15)
stg %r7,STACK_PTREGS_GPRS+(15*8)(%r15)