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target/arm/arm-semi: Factor out implementation of SYS_SEEK 

Factor out the implementation of SYS_SEEK via the new function
tables.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20190916141544.17540-12-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2019-09-16 15:15:40 +01:00
parent 0213fa452f
commit 45e88ffc76
1 changed files with 22 additions and 9 deletions
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31
target/arm/arm-semi.c
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@ -389,6 +389,8 @@ typedef uint32_t sys_writefn(ARMCPU *cpu, GuestFD *gf,
typedef uint32_t sys_readfn(ARMCPU *cpu, GuestFD *gf,
target_ulong buf, uint32_t len);
typedef uint32_t sys_isattyfn(ARMCPU *cpu, GuestFD *gf);
typedef uint32_t sys_seekfn(ARMCPU *cpu, GuestFD *gf,
target_ulong offset);
static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf)
{
@ -442,6 +444,16 @@ static uint32_t host_isattyfn(ARMCPU *cpu, GuestFD *gf)
return isatty(gf->hostfd);
}
static uint32_t host_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
{
CPUARMState *env = &cpu->env;
uint32_t ret = set_swi_errno(env, lseek(gf->hostfd, offset, SEEK_SET));
if (ret == (uint32_t)-1) {
return -1;
}
return 0;
}
static uint32_t gdb_closefn(ARMCPU *cpu, GuestFD *gf)
{
return arm_gdb_syscall(cpu, arm_semi_cb, "close,%x", gf->hostfd);
@ -468,11 +480,18 @@ static uint32_t gdb_isattyfn(ARMCPU *cpu, GuestFD *gf)
return arm_gdb_syscall(cpu, arm_semi_cb, "isatty,%x", gf->hostfd);
}
static uint32_t gdb_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
{
return arm_gdb_syscall(cpu, arm_semi_cb, "lseek,%x,%x,0",
gf->hostfd, offset);
}
typedef struct GuestFDFunctions {
sys_closefn *closefn;
sys_writefn *writefn;
sys_readfn *readfn;
sys_isattyfn *isattyfn;
sys_seekfn *seekfn;
} GuestFDFunctions;
static const GuestFDFunctions guestfd_fns[] = {
@ -481,12 +500,14 @@ static const GuestFDFunctions guestfd_fns[] = {
.writefn = host_writefn,
.readfn = host_readfn,
.isattyfn = host_isattyfn,
.seekfn = host_seekfn,
},
[GuestFDGDB] = {
.closefn = gdb_closefn,
.writefn = gdb_writefn,
.readfn = gdb_readfn,
.isattyfn = gdb_isattyfn,
.seekfn = gdb_seekfn,
},
};
@ -656,15 +677,7 @@ target_ulong do_arm_semihosting(CPUARMState *env)
return set_swi_errno(env, -1);
}
if (use_gdb_syscalls()) {
return arm_gdb_syscall(cpu, arm_semi_cb, "lseek,%x,%x,0",
gf->hostfd, arg1);
} else {
ret = set_swi_errno(env, lseek(gf->hostfd, arg1, SEEK_SET));
if (ret == (uint32_t)-1)
return -1;
return 0;
}
return guestfd_fns[gf->type].seekfn(cpu, gf, arg1);
case TARGET_SYS_FLEN:
GET_ARG(0);